SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Information to Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Millions			12 Months Ended
		Apr. 01, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Cash Flow Supplemental [Line Items]
Cash paid for interest by Holdings	[1]		$ 141.8	$ 151.3	$ 140.7
Cash paid for income taxes, net			45.5	22.3	4.6
Cash transferred from restricted accounts	[2]		0.0	(10.8)	(14.9)
Noncash investing and financing activities:
Interest expense - NCM			(22.0)	(22.6)	(23.2)
Change in accounts payable and accrued expenses for the acquisition of theater properties and equipment	[3]		(0.3)	5.4	(3.8)
Theater properties and other assets acquired under finance leases			52.0	0.0	0.0
Investment in NCMI/NCM - receipt of common units		$ 0.5	0.5	0.0	1.3
CUSA
Schedule Of Cash Flow Supplemental [Line Items]
Cash paid for interest by CUSA			$ 121.1	$ 130.6	$ 109.1

[1] Includes the cash interest paid by CUSA.

[2] Represents cash deposited in (transferred out) of collateral account during the period to support the issuance of letters of credit to lenders, net of returned deposits from such accounts upon the repayment of related debt.

[3] Additions to theater properties and equipment included in accounts payable as of December 31, 2023 and 2024 were $6.6 and $6.9 respectively.