CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2022	Jul. 01, 2021
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation expense	$ 3,500,000	$ 5,900,000
Amortization of intangibles recorded for network theater screen leases	12,400,000	12,300,000
Non-cash share-based compensation	3,000,000.0	4,800,000
Asset Impairment Charges	5,800,000	0
Other than Temporary Impairment Losses, Investments	0.1	0.0
Amortization of debt issuance costs	4,500,000	1,900,000
Non-cash loss (gain) on re-measurement of the payable to founding members under the tax receivable agreement	6,300,000	(1,400,000)
Other	(200,000)	(100,000)
Other cash flows from operating activities	1,500,000	100,000
Payment To Founding Members Under Tax Sharing Arrangement	0	(900,000)
Other Operating Activities, Cash Flow Statement	300,000	0
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net loss	(54,600,000)	(88,900,000)
Changes in operating assets and liabilities:
Receivables, net	(10,600,000)	4,400,000
Increase (Decrease) in Accounts Payable, Related Parties	0.0	600,000
Accounts payable and accrued expenses (including payments to related parties of $0.0 and $0.6, respectively)	600,000	1,000,000.0
Deferred revenue	(6,500,000)	1,200,000
Other, net	(300,000)	(5,000,000.0)
Net cash used in operating activities	(40,400,000)	(61,600,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,500,000)	(2,900,000)
Net cash used in investing activities	(1,500,000)	(2,900,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
CHANGE IN CASH AND CASH EQUIVALENTS:	(28,100,000)	(32,900,000)
Cash and cash equivalents at beginning of period	101,200,000	180,300,000
Cash and cash equivalents at end of period	73,100,000	147,400,000
Payment of dividends	(7,000,000.0)	(8,800,000)
Proceeds from Unsecured Lines of Credit	50,000,000.0	0
Proceeds from Issuance of Debt	0	50,000,000.0
Repayment of term loan facility	(2,400,000)	(1,500,000)
Payment of debt issuance costs	(6,800,000)	(6,700,000)
Repurchase of stock for restricted stock tax withholding	(200,000)	(1,400,000)
Net cash provided by financing activities	13,800,000	31,600,000
IncreaseDecreaseInDueToFoundingMemversCurrent	400,000	2,300,000
Supplemental disclosure of non-cash financing and investing activity:
Purchase of an intangible asset with NCM LLC equity	10,400,000	14,100,000
Other Significant Noncash Transaction, Value of Consideration Given	0	6,600,000
Increase in dividend equivalent accrual not requiring cash in the period	500,000	900,000
Supplemental disclosure of cash flow information:
Cash paid for interest	35,000,000.0	29,200,000
Cash payments (refunds) for income taxes	100,000	(100,000)
Founding Members
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Payment To Founding Members Under Tax Sharing Arrangement	0.0	600,000
Debt [Member]
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Nonoperating Gains (Losses)	5,900,000	(800,000)
Senior unsecured notes due 2026
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of Long-Term Debt	$ (19,800,000)	$ 0