Common membership units outstanding Units of Partnership Interest, Amount Revision of Prior Period [Axis] Revision of Prior Period [Axis] Document Type Document Type Other non-operating expense (income) Other Nonoperating Income (Expense) Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Payment To Founding Members Under Tax Sharing Arrangement Payments to affiliates for tax sharing agreement Payment To Founding Members Under Tax Sharing Arrangement Payment to founding members under tax sharing arrangement. Related Party Related Party [Axis] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Additional paid in capital/(deficit) Additional Paid In Capital And Accumulated Deficit Common Stock Additional paid in capital and accumulated deficit common stock. Payable to founding members under tax receivable agreement (including payables to related parties of $22.6 and $23.7, respectively) Long-term payable to founding members under tax receivable agreement Payable To Founding Members Under Tax Sharing Agreement Noncurrent Payable to founding members under tax sharing agreement, noncurrent. Debt issuance costs, long-term Debt issuance costs, long-term Debt Issuance Costs, Noncurrent, Net Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Concentration of Credit Risk and Significant Customers Concentration Of Credit Risk And Significant Customers Policy [Text Block] Disclosure of accounting policy for concentration of credit risk and significant customers. Other investments Cost Method Investments Regal Entertainment Group [Member] Regal Regal Entertainment Group [Member] Regal entertainment group. On-screen advertising time to satisfy agreement obligations, in seconds Length Of On Screen Advertising Time To Satisfy Agreement Obligations The length of on-screen advertising time to satisfy agreement obligations. New contract liabilities Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized Term loans - first tranche Term Loan -First Tranche [Member] Term loan. Range Statistical Measurement [Domain] LIABILITIES AND EQUITY/(DEFICIT) Liabilities and Equity [Abstract] Distributions to founding members Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Proceeds from Issuance of Debt Proceeds from Issuance of Debt Security Exchange Name Security Exchange Name Platinum Spot Revenue Percentage Platinum Spot Revenue Percentage Platinum Sport Revenue Percentage OPERATING (LOSS) INCOME Operating Income (Loss) Guarantee Obligations Amount Paid Guarantee Obligations Amount Paid Guarantee obligations amount paid. Payment of debt issuance costs Payments of Debt Issuance Costs Total current liabilities Liabilities, Current Cash distributions declared to members Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Make-good provision Accrued Reserves Accrued reserves. Covenant Waiver Max [Member] Covenant Waiver Max [Member] Covenant Waiver Max [Member] Summary of Changes in Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Other current assets and prepaid expenses Prepaid Expense and Other Assets, Current Variable Rate Variable Rate [Domain] Variable Rate Variable Rate [Axis] COMMITMENTS AND CONTINGENCIES (NOTE 8) Commitments and Contingencies Long-term marketable securities Aggregate Fair Value - Long term marketable securities Debt Securities, Available-for-sale, Noncurrent ASSETS Assets [Abstract] Investment, Name Investment, Name [Axis] Investment, Name [Axis] Accounting Policies [Abstract] Accounting Policies [Abstract] Share-based compensation issued Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Entity Address, State or Province Entity Address, State or Province Number of shares of restricted stock and stock units vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Amounts due to founding members, net Due to Related Parties, Current Operating lease payments Operating Lease, Payments Accounts payable Accounts Payable, Current Other Commitments [Table] Other Commitments [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Retained earnings (distributions in excess of earnings) Retained Earnings (Accumulated Deficit) Common membership units returned Common Membership Units Returned Common membership units returned. Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Senior secured leverage ratio Line of Credit, Covenant, Maximum Senior Secured Leverage Ratio Line of Credit, Covenant, Maximum Senior Secured Leverage Ratio Loss on modification and retirement of debt, net Gain (Loss) on Extinguishment of Debt Term Loan - Second Tranche Loss on Debt Modification Term Loan - Second Tranche Loss on Debt Modification Term Loan - Second Tranche Loss on Debt Modification Term of increase in payment percentage per theater patron Period Of Increase In Payment On Theater Patron Period of increase in payment on per theater patron. EQUITY/(DEFICIT): Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Schedule of Amounts Due to Founding Members, Net Schedule of Incentive Distributions Made to Managing Members or General Partners by Distribution [Table Text Block] Maximum potential payment Guarantor Obligations, Maximum Exposure, Undiscounted Preferred stock, $0.01 par value; 10,000,000 shares authorized, none issued and outstanding, respectively Preferred Stock, Value, Issued Fair Value, Separate Account Investment [Line Items] Fair Value, Separate Account Investment [Line Items] Lease, Cost Lease, Cost Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Investment Secondary Categorization [Axis] Investment Secondary Categorization [Axis] Other liabilities Other Liabilities, Noncurrent Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Share-based compensation expense/capitalized APIC, Share-based Payment Arrangement, Increase for Cost Recognition Document Information [Table] Document Information [Table] Marketing and Advertising Expense Marketing and Advertising Expense One Founding Members One Founding Members [Member] One founding members. Industrial Commercial Paper Commercial Paper Industrial [Member] Commercial paper industrial. REVENUE (including revenue from related parties of $0.4 and $4.3, respectively) Revenue Revenue from Contract with Customer, Excluding Assessed Tax Fair Value, Measurement Frequency Measurement Frequency [Domain] CONSOLIDATED NET LOSS Consolidated net loss Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Short-Term U.S. Government Treasury Bonds US Government Treasury Debt Securities [Member] US Government Treasury Debt Securities [Member] Impaired Investment Impaired Investment Impaired Investment Cash dividends declared (in usd per share) Dividends Payable, Amount Per Share Range of terms, in years Revenue Guarantee Period Revenue guarantee period. Statement [Line Items] Statement [Line Items] Future patron payment Future period Forecast [Member] Class of Stock Class of Stock [Domain] Line of Credit Facility, Asset Restrictions Credit Facility Availability Compliance Credit Facility Availability Compliance Tax Period [Axis] Tax Period [Axis] Proceeds from revolving credit facility Proceeds from Long-term Lines of Credit Available-for-sale Securities, Gross Unrealized Loss Available-for-sale Securities, Gross Unrealized Loss Measurement Input Type [Domain] Measurement Input Type [Domain] General Company Information [Table] General Company Information [Table] General company information. Statement [Table] Statement [Table] Write-offs, net Accounts Receivable, Allowance for Credit Loss, Writeoff Range Statistical Measurement [Axis] Credit Facility Credit Facility [Axis] Debt Instrument Debt Instrument, Fair Value Disclosure Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Repayments of revolving credit facility Repayments of Long-term Lines of Credit U.S. Government Agency Bonds US Government Agencies Debt Securities [Member] Fair Value, Nonrecurring [Member] Fair Value, Nonrecurring [Member] Accrued distributions to founding members (including accrued distributions to related parties Accrued Integration And Other Encumbered Theater Payments Due To Founding Members, Financing Activities Accrued Integration And Other Encumbered Theater Payments Due To Founding Members, Financing Activities Percentage of cash savings related to taxes Percentage Of Cash Savings Related To Taxes Percentage of cash savings related to taxes. Changes in Taxes and LLC Ownership Changes in Taxes and LLC Ownership Changes in Taxes and LLC Ownership Entity Small Business Entity Small Business Consolidation Consolidation, Policy [Policy Text Block] Fair Value Hierarchy Fair Value Hierarchy and NAV [Domain] Borrowings Debt Disclosure [Text Block] Purchase of movie tickets and concession products (included in prepaid expenses) (1) Prepaid Expense, Current Weighted average term, esa and affiliate (in years) Weighted Average Term, ESA and Affiliate Weighted Average Term, ESA and Affiliate Proceeds from sale and maturities of marketable securities Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Amendment Flag Amendment Flag Schedule of Loss Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] WEIGHTED AVERAGE SHARES OUTSTANDING: Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Founding member advertising revenue from beverage concessionaire agreements Founding Member Advertising Revenue From Beverage Concessionaire Agreements [Member] Founding member advertising revenue from beverage concessionaire agreements. Fair Values of the Company's Assets Fair Value, Assets Measured on Recurring Basis [Table Text Block] Outstanding letters of credit Long-term Line of Credit Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Related Party Related Party [Domain] Measurement Frequency Measurement Frequency [Axis] Increase (decrease) in dividend equivalent accrual not requiring cash in the period Increase Decrease In Dividends Not Requiring Cash Increase decrease in dividends not requiring cash. Related Party Transaction [Line Items] Related Party Transaction [Line Items] Short-term marketable securities Aggregate Fair Value - Short term marketable securities Debt Securities, Available-for-sale, Current Network costs Network Costs Direct costs arising from transactions associated with network operations. These costs are categorized as cost of goods sold. Financial Instruments [Domain] Financial Instruments [Domain] Total amounts due to founding members, net Related Party Transaction, Due from (to) Related Party Estimated Fair Values of Company's Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Gross unrealized losses related to individual securities had been in continuous loss position for 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Subsequent Event Subsequent Events [Text Block] Costandotherreimbursement Cost and Other Reimbursement Cost and Other Reimbursement Debt payment terms Debt Instrument, Payment Terms Recently Issued Accounting Pronouncements Recently Issued Accounting Pronouncements Policy [Text Block] Recently issued accounting pronouncements. Amortized Cost Basis Debt Securities, Available-for-sale, Amortized Cost Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Allowance for doubtful accounts receivable Accounts Receivable, Allowance for Credit Loss, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Other Commitments [Line Items] Other Commitments [Line Items] Theater access fees and revenue share, net of beverage revenues and other encumbered theater payments Theater Access Fees Net Of Beverage Revenues And Other Encumbered Theaters Payments Theater access fees net of beverage revenues and other encumbered theaters payments. Lease Cost Lease, Cost [Table Text Block] Percentage of common membership units outstanding Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Proceeds from notes receivable - founding members (including payments from related parties of $— and $—, respectively) Proceeds from related parties Proceeds from Collection of Long-term Loans to Related Parties Interest income Interest and Other Income Other assets Other Assets, Noncurrent Amounts due from founding members Due From Founding Members, Current Due From Founding Members, Current Negative Distribution Made to Limited Liability Company Member, Cash Distributions Deferred Negative Distribution Made to Limited Liability Company Member, Cash Distributions Deferred Negative Distribution Made to Limited Liability Company Member, Cash Distributions Deferred Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Cumulative Effect of New Accounting Principle in Period of Adoption (Deprecated 2020-01-31) Cumulative-effect adjustment for adoption of ASU 2014-09 Cumulative Effect of Adoption of ASU 2016-13, Adjustment to Retained Earnings Cumulative Effect of Adoption of ASU 2016-13, Adjustment to Retained Earnings Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Membership units exchangeable into common stock ratio Membership Units Conversion Ratio Membership units conversion ratio. TOTAL ASSETS Assets Tax Year 2017 Tax Year 2017 [Member] Related Party Transactions Related Party Transactions Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Interest on borrowings Interest Expense, Debt The Company Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Title of 12(b) Security Title of 12(b) Security Payable to founding members under tax receivable agreement (including payables to related parties of $0.0 and $0.6, respectively) Current payable to founding members under tax receivable agreement Payable To Founding Members Under Tax Sharing Agreement Current Payable to founding members under tax sharing agreement, current. Intangible assets, net of accumulated amortization of $229.2 and $223.0, respectively Common unit adjustments, net of amortization and integration payments (included in intangible assets) Finite-Lived Intangible Assets, Net General Company Information [Line Items] General Company Information [Line Items] General company information. Depreciation expense Depreciation, Nonproduction Senior Notes Due Two Zero Two Six [Member] [Member] Senior Notes Due Two Zero Two Six [Member] [Member] Senior Notes Due Two Zero Two Six [Member] [Member] Subsequent Event Type Subsequent Event Type [Axis] Antidilutive Securities Antidilutive Securities [Axis] Customer Percentage of AR Customer Percentage of Accounts Receivable Customer Percentage of Accounts Receivable Amortization of intangibles recorded for network theater screen leases Amortization of Leased Asset Initial Credit Agreement Initial Credit Agreement [Member] Initial Credit Agreement Product and Service [Axis] Products and Services Product and Service [Axis] Total liabilities Liabilities Maturities Available-For-Sale Debt Securities, Maturity Available-For-Sale Debt Securities, Maturity Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Investment Type Investment Type [Axis] Integration and other encumbered payments, related parties - financing activities Proceeds From Integration And Other Encumbered Theater Payments Made By Affiliates, Financing Activities Payments received from related parties for their acquired theatres that are subject to an existing on-screen advertising contract. Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Credit Agreement [Axis] Credit Agreement [Axis] Credit Agreement Purchase of an intangible asset with NCM LLC equity Noncash or Part Noncash Acquisition, Intangible Assets Acquired Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Cash payment due to founding members/managing member Distributions payable to founding members Distributions Payable Distributions payable. Weighted-average interest rate Debt, Weighted Average Interest Rate Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] AffiliateCircuitSharePayment [Member] AffiliateCircuitSharePayment [Member] AffiliateCircuitSharePayment Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Deferred tax assets reduction Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Debt instrument, frequency of periodic payment Debt Instrument, Frequency of Periodic Payment Additional Paid in Capital (Deficit) Additional Paid-in Capital [Member] Debt Instrument [Axis] Debt Instrument Debt Instrument [Axis] Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Other Operating Activities, Cash Flow Statement Other Operating Activities, Cash Flow Statement Cost of Goods and Services Sold Proceedsfromdispositionofintangibleassetsbynetworkaffiliates Proceeds from disposition of intangible assets by network affiliates (AMC acquisition of Cinetopia) Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Unbilled accounts receivable Unbilled Contracts Receivable Adjustments to reconcile consolidated net loss to net cash (used in) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Common membership units issued Common Membership Units Issued Common membership units issued. Percentage of increase in payment per digital screen and digital cinema equipment Percentage Of Increase In Payment Per Digital Screen And Digital Cinema Equipment Percentage of increase in payment per digital screen and digital cinema equipment. Investment in AC JV, LLC Equity Method Investments Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Cost-method ownership percentage Cost Method Investment Ownership Percentage Cost method investment ownership percentage. Variable Lease, Cost Variable Lease, Cost Nonoperating Gains (Losses) Nonoperating Gains (Losses) Interest income from notes receivable (included in interest income) Interest Income, Related Party Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Revolving credit facility Revolving Credit Facility [Member] LOSS BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Tax Year 2018 [Member] Tax Year 2018 [Member] Subsequent Event Subsequent Event [Member] Net senior secured leverage ratio Debt Instrument, Dividend Restriction, Net Senior Secured Leverage Ratio Debt Instrument, Dividend Restriction, Net Senior Secured Leverage Ratio Noncancelable contract terms Noncancelable Contract Terms Noncancelable contract terms. Common stock, shares authorized (in shares) Common Stock, Shares Authorized Add: Dilutive effect of stock options and restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements customer ten percent of revenue Customer with revenue in excess of ten percent of total revenue Customer with revenue in excess of ten percent of total revenue Common Membership Units Redeemed Common Membership Units Redeemed Common Membership Units Redeemed CumulativeEffectAdjustmentForAdoptionOfASU201613ToRetainedEarnings CumulativeEffectAdjustmentForAdoptionOfASU201613ToRetainedEarnings CumulativeEffectAdjustmentForAdoptionOfASU201613ToRetainedEarnings Net total leverage ratio, covenant Debt Instrument, Covenant, Net Total Leverage Ratio Debt Instrument, Covenant, Net Total Leverage Ratio Revenue Recognition Revenue [Policy Text Block] Aggregate percentage of theater access fee paid Percentage Of Theater Access Fee Paid Percentage of theater access fee paid. Asset restrictions Line of Credit Facility, Asset Restrictions Cinemark Holdings Inc [Member] Cinemark Cinemark Holdings Inc [Member] Cinemark holdings, Inc. Debt Instrument, Restrictive Covenants Credit Agreement EBITDA Limit Credit Agreement EBITDA Limit Fair Value Estimate of Fair Value Measurement [Member] Promissory Notes Promissory Notes [Member] Promissory notes. Income Statement [Abstract] Income Statement [Abstract] Repayment of term loan facility Repayments of Senior Debt Long-term lease liability Operating Lease, Liability, Noncurrent Interest receivable on notes receivable (included in other current assets) Interest Receivable Senior secured notes due 2028 Senior Unsecured Notes Due Two Thousand Twenty Eight [Member] Senior Unsecured Notes Due Two Thousand Twenty Eight [Member] Reversal of related deferred rent liability Deferred Rent Credit, Noncurrent Estimates Use of Estimates, Policy [Policy Text Block] CURRENT ASSETS: Assets, Current [Abstract] Income Tax Authority [Domain] Income Tax Authority [Domain] CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Changes In Equity Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Increase (decrease) in intangible assets, net Finite-Lived Intangible Assets, Period Increase (Decrease) COMPREHENSIVE LOSS ATTRIBUTABLE TO NCM, INC. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Term Loan -Second Tranche Term Loan -Second Tranche [Member] Term Loan -Second Tranche Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Debt Covenant Period [Domain] Debt Covenant Period [Domain] [Domain] for Debt Covenant Period [Axis] Scenario [Domain] Scenario [Domain] Stock Options And Non-Vested Restricted Stock Stock Options And Non Vested Restricted Stock [Member] Stock options and non-vested restricted stock. Legal Entity Legal Entity [Axis] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code On-screen advertising time which founding members have right to purchase, in seconds Length Of On Screen Advertising Time Which Founding Members Have Right To Purchase Length of on-screen advertising time which founding members have a right to purchase Impairment of investment Cost-method Investments, Other than Temporary Impairment Income Tax Authority [Axis] Income Tax Authority [Axis] Document Period End Date Document Period End Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Equity in earnings of non-consolidated entities Income (Loss) from Equity Method Investments Income (Loss) from Equity Method Investments Summary of Revenue from Contracts with Customers Disaggregation of Revenue [Table Text Block] Long Term Marketable Securities [Member] Long Term Marketable Securities [Member] Long-term marketable securities. Debt [Member] Debt [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Two Founding Members Two Founding Members [Member] Two founding members. Long-term Debt, Type Long-term Debt, Type [Domain] Non-cash share-based compensation Share-based Payment Arrangement, Noncash Expense Entity Entity [Domain] Repurchase of stock for restricted stock tax withholding Payment, Tax Withholding, Share-based Payment Arrangement Financial Commercial Paper Commercial Paper Financial [Member] Commercial paper financial. Tax Year 2019 [Member] Tax Year 2019 [Member] Base Rate Base Rate [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Schedule of Marketable Securities Debt Securities, Available-for-sale [Table Text Block] Common stock owned (in shares) Common Stock Owned, Shares Common Stock Owned, Shares Local advertising revenue Local Advertising Revenue [Member] Local Advertising Revenue [Member] Intangible Assets Intangible Assets Disclosure [Text Block] Long-term Debt Long-term Debt Deferred revenue Increase (Decrease) in Contract with Customer, Liability On-screen advertising time purchased, in seconds Length Of On Screen Advertising Time Which Founding Members Purchased Length of on screen advertising time which founding members purchased. Credit Agreement [Domain] Credit Agreement [Domain] Credit Agreement [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Pretax Book Income Pretax Book Income Pretax Book Income Related Party Costs Theater access fee Related Party Costs Net total leverage ratio Debt Instrument, Net Total Leverage Ratio Debt Instrument, Net Total Leverage Ratio Schedule of Mandatory Distributions to Members Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block] Advertising operating costs Cost of Goods and Services Sold Aggregate Fair Value - Total marketable securities Debt Securities, Available-for-sale Total Costs and Expenses Equity Components Equity Components [Axis] Founding Members Related Party Founding Members [Member] Related Party Founding Members [Member[ Debt Instrument, Name [Domain] Debt Instrument, Name Debt Instrument, Name [Domain] Debt Covenant Period [Axis] Debt Covenant Period [Axis] Debt Covenant Period [Axis] Minimum Minimum [Member] Short-term lease liability Operating Lease, Liability, Current Repayment of term loan facility Repayments of Notes Payable Amortization rate Debt Instrument, Amortization Rate Debt Instrument, Amortization Rate Less: Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Entity Interactive Data Current Entity Interactive Data Current Fair Value Measurements Fair Value Disclosures [Text Block] Unused line fee, percent Line of Credit Facility, Commitment Fee Percentage Share-Based Compensation Share-based Payment Arrangement [Policy Text Block] Entity Registrant Name Entity Registrant Name Subsequent Event Type Subsequent Event Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Total non-current assets Assets, Noncurrent Senior secured notes due 2028 Senior Secured Notes Due Two Thousand Twenty Eight [Member] Senior Secured Notes Due Two Thousand Twenty Eight [Member] Asset Impairment Charges Asset Impairment Charges AMC and Cinemark American Multi Cinema Inc And Cinemark Holdings Inc [Member] American Multi-Cinema, Inc. and Cinemark Holdings, Inc. Number of reportable segment Number of Reportable Segments Payment of dividends Payments of Ordinary Dividends, Common Stock Cash and cash equivalents used in determining senior secured leverage ratio Debt Instrument, Senior Secured Leverage Ratio, Cash And Cash Equivalents Basis Debt Instrument, Senior Secured Leverage Ratio, Cash And Cash Equivalents Basis National and regional advertising revenue National Advertising Revenue [Member] National advertising revenue. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Receivables, net of allowance of $1.9 and $2.3, respectively Accounts Receivable, after Allowance for Credit Loss, Current Common Units Common Units [Member] Common units. Investments by Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] Income tax and other impacts of NCM LLC ownership changes Adjustments to Additional Paid in Capital, Other Adjustments for New Accounting Pronouncements Accounting Standards Update [Axis] Customer with revenue in excess of ten percent of Accounts Payable Customer with revenue in excess of ten percent of Accounts Payable Customer with revenue in excess of ten percent of Accounts Payable Noncancelable Long Term Contracts Noncancelable Long Term Contracts Noncancelable Long Term Contracts Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Gross unrealized losses related to individual securities Debt Securities, Available-for-sale, Unrealized Loss Tax Year 2020 Tax Year 2020 [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Document Transition Report Document Transition Report Senior secured leverage ratio Senior Secured Leverage Ratio Senior secured leverage ratio. NCM LLC equity issued for purchase of intangible asset Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance Of Equity For Purchase Of Intangible Asset Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance Of Equity For Purchase Of Intangible Asset NON-OPERATING EXPENSES: Nonoperating Income (Expense) [Abstract] Common Stock, Dividends, Per Share, Declared Dividends per share (in usd per share) Common Stock, Dividends, Per Share, Declared Debt instrument face amount Debt Instrument, Face Amount Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Debt issuance costs, net Debt Issuance Costs, Line of Credit Arrangements, Net Document Quarterly Report Document Quarterly Report Total assets Assets, Fair Value Disclosure Costs and Other Reimbursment Costs and Other Reimbursment Costs and Other Reimbursment Cinemark and Regal Cinemark and Regal [Member] Cinemark and Regal [Member] Cinemark and Regal [Member] Finite-Lived Intangible Assets, Cost Incurred to Renew or Extend Finite-Lived Intangible Assets, Cost Incurred to Renew or Extend Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Supplemental disclosure of non-cash financing and investing activity: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Receivables from related parties, current Financing Receivable, after Allowance for Credit Loss, Current Accounting Standards Update 2016-13 [Member] Accounting Standards Update 2016-13 [Member] Deferred revenue Balance at beginning of period Balance at end of period Contract with Customer, Liability, Current Subsequent Events [Line Items] Subsequent Event [Line Items] Credit Facility Revolving Credit Facility [Member] Credit Facility [Domain] Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Letter of Credit Letter of Credit [Member] Basic (in usd per share) Earnings Per Share, Basic (Gain) loss on re-measurement of the payable to founding members under the tax receivable agreement Gain (Loss) On Re Measurement Of Payable To Founding Members Under Tax Sharing Agreement Gain (loss) on re-measurement of payable to founding members under tax sharing agreement. Accrued distributions to founding members (including accrued distributions to related parties of $0.0 and $4.3, respectively) Noncash Distributions To Founding Members Noncash distributions to founding members. Entity File Number Entity File Number Debt Disclosure [Abstract] Debt Disclosure [Abstract] Income tax and other impacts of subsidiary ownership changes Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Income Tax And Other Impacts Of Subsidiary Ownership Change Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Income Tax And Other Impacts Of Subsidiary Ownership Change Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Selling and marketing costs Selling and Marketing Expense Fair Value, Separate Account Investment [Table] Fair Value, Separate Account Investment [Table] Schedule of Other Assets Schedule of Cost Method Investments [Table Text Block] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Short-term Debt, Type Short-term Debt, Type [Axis] CumulativeEffectAdjustmentForAdoptionOfASU201613Net CumulativeEffectAdjustmentForAdoptionOfASU201613Net CumulativeEffectAdjustmentForAdoptionOfASU201613Net Estimated revenue to be recognized on noncancelable leases Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Share-based Payment Arrangement, Expense Share-based Payment Arrangement, Expense Common stock, $0.01 par value; 175,000,000 shares authorized, 80,017,551 and 78,040,818 issued and outstanding, respectively Common Stock, Value, Issued Other Payables to FM Other Payables to Founding Members Other Payables to Founding Members Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Deferred tax assets, net of valuation allowance of $217.6 and $212.0, respectively Total other investments Other Long-term Investments Commercial Paper [Member] Commercial Paper [Member] NON-CURRENT ASSETS: Assets, Noncurrent [Abstract] Less: current portion of debt Long-term Debt, Current Maturities Term Loan - Second Tranche, Discount Value Term Loan - Second Tranche, Discount Value Term Loan - Second Tranche, Discount Value Entity Current Reporting Status Entity Current Reporting Status Common membership units issued, net of returned Common Membership Units Issued Net Of Units Surrendered Common membership units issued net of units surrendered. Term Loan - Second Tranche, Debt Issuance Costs Term Loan - Second Tranche, Debt Issuance Costs Term Loan - Second Tranche, Debt Issuance Costs Subsequent Event [Table] Subsequent Event [Table] Share-based compensation issued (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Comprehensive income, net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Recently Adopted Accounting Pronouncements Recently Adopted Accounting Pronouncements Policy [Text Block] Recently adopted accounting pronouncements. Short-term debt Short-term Debt Document [Domain] Document [Domain] Document Information, Document [Axis] Document Information, Document [Axis] Common stock, shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Line of Credit, Covenant, Maximum Senior Secured Leverage Ratio Outstanding Credit Facility Waiver Limit Outstanding Credit Facility Waiver Limit AdjustmentsToAdditionalPaidInCapitalInvestmentInSubsidiary AdjustmentsToAdditionalPaidInCapitalInvestmentInSubsidiary AdjustmentsToAdditionalPaidInCapitalInvestmentInSubsidiary Debt Instrument, Restrictive Covenants Debt Instrument, Restrictive Covenants Long-term debt, net of debt issuance costs of $10.0 and $8.0, respectively Carrying value of long-term debt Long-term Debt, Excluding Current Maturities Other than Temporary Impairment Losses, Investments Impairment on Investment Impairment on Investment Receivables, net Increase (Decrease) in Accounts Receivable Debt Instrument [Line Items] Debt Instrument [Line Items] Local And Regional Advertising Revenue [Member] Local And Regional Advertising Revenue [Member] Local and regional advertising revenue. Total NCM, Inc. stockholders’ equity/(deficit) Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND EQUITY/(DEFICIT) Liabilities and Equity Income Taxes Income Tax Disclosure [Text Block] Total non-current liabilities Liabilities, Noncurrent Entity Address, City or Town Entity Address, City or Town Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Accrued payroll and related expenses Employee-related Liabilities, Current Fair Value, Hierarchy Fair Value Hierarchy and NAV [Axis] Operating Lease, Cost Operating Lease, Cost Administrative and other costs General and Administrative Expense Financial Instrument [Axis] Financial Instrument [Axis] Type of Adoption Accounting Standards Update [Domain] Shares excluded from the calculation of diluted weighted average shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Other Other Noncash Income (Expense) Short-term Lease, Cost Short-term Lease, Cost State and Federal State And Federal [Member] State And Federal [Member] Equity Component Equity Component [Domain] Additional amount accrued related to minimum guarantees Guarantor Obligations, Maximum Exposure, Undiscounted, Additional Amount Accrued Guarantor Obligations, Maximum Exposure, Undiscounted, Additional Amount Accrued American Multi Cinema Inc [Member] AMC American Multi Cinema Inc [Member] American Multi-Cinema, Inc. Deferred tax assets, valuation allowance Deferred Tax Assets, Valuation Allowance Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Accrued Distributions Made to LLC Accrued Distributions Made to Related Parties Accrued Distributions Made to Related Parties Property and equipment, net of accumulated depreciation of $55.3 and $77.7, respectively Property, Plant and Equipment, Net Covenant During Waiver Min [Member] Covenant During Waiver Min [Member] Covenant During Waiver [Member] Entity Tax Identification Number Entity Tax Identification Number NET LOSS ATTRIBUTABLE TO NCM, INC. Net loss attributable to NCM, Inc. Net loss attributable to NCM, Inc. (in millions) Net Income (Loss) Attributable to Parent Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] 2019 ESA Amendment Extension Period 2019 ESA Amendment Extension Period 2019 ESA Amendment Extension Period Other current liabilities Other Liabilities, Current LIBOR London Interbank Offered Rate (LIBOR) [Member] Investment, Name Investment, Name [Domain] Investment, Name [Domain] National and Regional Advertising Revenue [Member] [Member] National and Regional Advertising Revenue [Member] [Member] National and Regional Advertising Revenue [Member] [Member] Long-term Debt, Type Long-term Debt, Type [Axis] Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date OPERATING EXPENSES: Operating Expenses [Abstract] Amount Increase In Payment Per Theater Patron Amount Increase In Payment Per Theater Patron Amount Increase In Payment Per Theater Patron Credit Agreement Second Amendment Credit Agreement Second Amendment [Member] Credit Agreement Second Amendment NET LOSS PER NCM, INC. COMMON SHARE: Earnings Per Share [Abstract] Senior unsecured notes due 2026 Senior Unsecured Notes Due Two Zero Two Six [Member] Senior unsecured notes due two zero two six. Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule of Allowance for Doubtful Accounts Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] Debt instrument issued percentage of face value Debt Instrument Issued Percentage Of Face Value Debt instrument issued percentage of face value. Debt Securities, Available-for-sale, Realized Gain (Loss) Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss NCM LLC equity issued for purchase of intangible asset Noncontrolling Interest, Increase from Subsidiary Equity Issuance Integration payments due from founding members Integration Payments Due From Related Parties Integration payments due from related parties. Document Fiscal Period Focus Document Fiscal Period Focus Non-cash (gain) loss on re-measurement of the payable to founding members under the tax receivable agreement Non Cash Gain Loss On Re Measurement Of Payable To Founding Members Under Tax Sharing Agreement Non-cash gain (loss) on re-measurement of payable to founding members under tax sharing agreement. Certificates of Deposit Certificates of Deposit [Member] Purchases of marketable securities Payments to Acquire Available-for-sale Securities Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Entity Filer Category Entity Filer Category Common Stock Common Stock [Member] Product and Service [Domain] Products and Services Product and Service [Domain] CumulativeEffectAdjustmentForAdoptionOfASU201613ToNCI CumulativeEffectAdjustmentForAdoptionOfASU201613ToNCI CumulativeEffectAdjustmentForAdoptionOfASU201613ToNCI Promissory notes receivable from founding members Notes Receivable, Related Parties Remaining borrowing capacity of credit facility Line of Credit Facility, Remaining Borrowing Capacity Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Senior Secured Credit Facility Senior Secured Credit Facility [Member] Senior secured credit facility. Interest rate on notes receivable Notes Receivable Stated Interest Rate Notes receivable stated interest rate. Municipal Notes [Member] Municipal Notes [Member] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Interest Rate Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Municipal Bonds [Member] Municipal Bonds [Member] Provision for bad debt Accounts Receivable, Credit Loss Expense (Reversal) Revenue from contract, payment due period from the customer Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Write-off of debt issuance costs Write off of Deferred Debt Issuance Cost Accumulated depreciation, property and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] (Loss) earnings per NCM, Inc. share: Earnings Per Share, Diluted [Abstract] Change from net loss income attributable to NCM, Inc. and transfers from noncontrolling interests Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net Related Party Transactions [Abstract] Related Party Transactions [Abstract] Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur Percentage Increase Decrease In Theater Attendance For Common Unit Adjustment To Occur Percentage change in theater attendance for Common Unit adjustment to occur. CHANGE IN CASH AND CASH EQUIVALENTS: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect NCM, LLC. National Cine Media L L C [Member] National CineMedia, LLC. Total Nonoperating Income (Expense) Senior secured notes due 2022 Senior Notes Due Two Zero Two Two [Member] Senior notes due two zero two two. Impaired investment balance Impaired investment balance Impaired investment balance Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Percentage of increase in payment per theatre patron Percentage Of Increase In Payment Per Theater Patron Percentage of increase in payment per theater patron. Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Basis spread on variable rate, percent Debt Instrument, Basis Spread on Variable Rate Other Significant Noncash Transaction, Value of Consideration Given Other Significant Noncash Transaction, Value of Consideration Given Subsequent Events [Abstract] Subsequent Events [Abstract] Ownership [Axis] Ownership [Axis] Document Information [Line Items] Document Information [Line Items] Ownership [Domain] Ownership [Domain] Carrying Value Reported Value Measurement [Member] Dividends payable Dividends Payable Ownership percentage Equity Method Investment, Ownership Percentage Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Tax Period [Domain] Tax Period [Domain] Total equity/(deficit) Balance Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Class of Stock Class of Stock [Axis] Payments to Third Parties for Extension of Intangible Assets Payments to Third Parties for Extension of Intangible Assets Payments to Third Parties for Extension of Intangible Assets Income tax benefit Income tax benefit Income Tax Expense (Benefit) Cash (refunds) payments for income taxes Income Taxes Paid, Net Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Accrued expenses Accrued Liabilities, Current Diluted (in usd per share) Earnings Per Share, Diluted Impaired Investments Impaired Investments [Member] Impaired investments. Local Phone Number Local Phone Number Term Loan - Second Tranche, net Term Loan - Second Tranche, net Term Loan - Second Tranche, net Short Term Marketable Securities [Member] Short Term Marketable Securities [Member] Short-term marketable securities. Accrued integration and other encumbered theater payments due from founding members Accrued Integration And Other Encumbered Theater Payments Due From Founding Members, Financing Activities Accrued Integration And Other Encumbered Theater Payments Due From Founding Members, Financing Activities Accrued integration and other encumbered theater payments due from founding members. Schedule of Outstanding Debt Schedule of Debt [Table Text Block] Outstanding borrowings Debt Instrument, carrying value Long-term Debt, Gross Other cash flows from operating activities Proceeds From Integration And Other Encumbered Theater Payments Made By Affiliates, Operating Activities Proceeds From Integration And Other Encumbered Theater Payments Made By Affiliates, Operating Activities Proceeds From Integration And Other Encumbered Theater Payments Made By Affiliates, Operating Activities Entity Address, Address Description Entity Address, Address Line One Theater access fees and revenue share to founding members (including fees to related parties of $1.3 and $12.5, respectively) Theater Access Fees Theater Access Fees Entity Emerging Growth Company Entity Emerging Growth Company Financial Certificates Of Deposit Financial Certificates Of Deposit [Member] Financial certificates of deposit. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income tax benefit Deferred Income Tax Expense (Benefit) Borrowing amount of credit facility Line of Credit Facility, Maximum Borrowing Capacity Contract Liabilities Contract Liabilities [Roll Forward] Contract Liabilities [Roll Forward] Accumulated amortization, intangible assets Finite-Lived Intangible Assets, Accumulated Amortization National Cine Media Inc [Member] NCM Inc. National Cine Media Inc [Member] National CineMedia, Inc. Operating Costs and Expenses Operating Costs and Expenses Maximum Maximum [Member] Amortization of debt issuance costs Amortization of Debt Issuance Costs Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Noncontrolling Interest Noncontrolling Interest [Member] Cash dividends declared Cash dividends on shares of NMC Inc Dividends, Common Stock, Cash Retained Earnings (Distribution in Excess of Earnings) Retained Earnings Retained Earnings [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis Measurement Basis [Axis] Deferred income tax expense, net of valuation allowance Deferred income tax expense, net of valuation allowance Deferred income tax expense, net of valuation allowance Distributions to founding members Payments of Distributions to Affiliates Payments of Distributions to Affiliates Short-term Debt, Type Short-term Debt, Type [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Allowance for credit losses Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss Liabilities recorded for related party obligations Guarantor Obligations, Current Carrying Value Investments Investments [Domain] NON-CURRENT LIABILITIES: Liabilities, Noncurrent [Abstract] Theaters Open in Network Theaters Open in Network Theaters Open in Network Trading Symbol Trading Symbol Fair value of cost method investment Cost Method Investments, Fair Value Disclosure Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Revenue from Rights Concentration Risk [Member] Revenue from Rights Concentration Risk [Member] Amounts due to/from founding members, net Increase (Decrease) in Due to Related Parties, Current Loss Per Share Earnings Per Share [Text Block] Debt instrument, repurchase amount Debt Instrument, Repurchase Amount Contract with Customer, Liability, New Contract Liabilities Contract with Customer, Liability, New Contract Liabilities Contract with Customer, Liability, New Contract Liabilities CURRENT LIABILITIES: Liabilities, Current [Abstract] Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Shell Company Entity Shell Company Fair Value, Measurements, Recurring Fair Value, Recurring [Member] AC JV, LLC A C J V L L C [Member] A C J V L L C [Member] AC JV, LLC. Remaining term (in years) Agreement With Founding Members, Remaining Term Agreement With Founding Members, Remaining Term Income Tax Contingency [Table] Income Tax Contingency [Table] Proceeds from Lines of Credit Proceeds from Lines of Credit Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]