SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Information to Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Schedule Of Cash Flow Supplemental [Line Items]
Cash paid for interest by Holdings	[1]	$ 151.3		$ 140.7	$ 108.2
(Refunds received) cash paid for income taxes, net		22.3		4.6	(136.5)
Cash deposited in (transferred from) restricted accounts	[2]	(10.8)		(14.9)	(11.9)
Noncash investing and financing activities:
Interest expense - NCM		(22.6)		(23.2)	(23.6)
Change in accounts payable and accrued expenses for the acquisition of theatre properties and equipment	[3]	5.4		(3.8)	20.1
Theatre properties acquired under finance leases		0.0	[3]	0.0	0.7
Investment in NCMI/NCM - receipt of common units		0.0	[3]	1.3	10.2
CUSA
Schedule Of Cash Flow Supplemental [Line Items]
Cash paid for interest by CUSA		$ 130.6		$ 109.1	$ 87.8

[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 theatre properties and equipment included in accounts payable as of December 31, 2022 and 2023 were $12.0 and $6.6 respectively.