INVESTMENT IN NATIONAL CINEMEDIA, INC / NATIONAL CINEMEDIA LLC - Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Impairment of long-lived and other assets		$ (16.6)		$ (174.1)		$ (20.8)
Investment In NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		9.6		135.4		152.0
Receipt of common units due to annual common unit adjustment				1.3		10.2
Receipt under tax receivable agreement						(0.2)
Equity in income (loss) of affiliates				(13.9)		(26.6)
Impairment of long-lived and other assets		(0.7)		(113.2)	[1]
Ending Balance				9.6		135.4
Investment in NCMI [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in income (loss) of affiliates	[2]	(3.2)
Impairment of long-lived and other assets	[3]	0.7
Unrealized Gain (Loss) on Investments	[1]	12.4
Ending Balance		18.1
NCM Screen Advertising Advances
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		(338.2)		(346.0)		(344.3)
Receipt of common units due to annual common unit adjustment				(1.3)		(10.2)
Interest accrued on NCM screen advertising advances		(22.6)	[4]	(23.2)	[4]	(23.6)
Amortization of screen advertising advances		32.4		32.3		32.1
Ending Balance		(328.4)		(338.2)		(346.0)
NCM Screen Advertising Advances | NCM
Schedule Of Equity Method Investments [Line Items]
Receipt of common units due to annual common unit adjustment	[4]			(1.3)
Distributions from NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance	[5]			(0.1)
Receipt under tax receivable agreement	[5]					(0.1)
Ending Balance	[5]					(0.1)
Equity in Loss
Schedule Of Equity Method Investments [Line Items]
Beginning Balance	[2]	13.9		26.6
Equity in income (loss) of affiliates	[2]	3.2		13.9		26.6
Ending Balance	[2]	3.2		13.9		26.6
Other Revenue
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		(52.2)		(44.1)
Revenues earned under ESA	[6]	(20.9)		(19.9)		(12.0)
Amortization of screen advertising advances		(32.4)		(32.3)		(32.1)
Ending Balance		(53.3)		(52.2)		(44.1)
Interest Expense - NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		23.2		23.6
Interest accrued on NCM screen advertising advances		22.6		23.2		23.6
Ending Balance		22.6		23.2		23.6
Cash Received
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		19.9		12.3
Revenues earned under ESA	[6]	20.9		19.9		12.0
Receipt under tax receivable agreement						0.3
Ending Balance		$ 20.9		$ 19.9		$ 12.3

[1] See Investment in National CineMedia below.

[2] Equity in loss was recorded through April 11, 2023, the date NCM filed its bankruptcy petition, after which the Company applied the fair value accounting method as discussed below.

[3] Reflected in impairment of long-lived and other assets on the consolidated income statement for the year indicated. See further discussion at Investment in National CineMedia below

[4] See Significant Financing Component in Note 9 for discussion of NCM screen advertising advances and maturity of balances as of December 31, 2023.

[5] Excess cash distributions from NCM to its members were restricted through December 2023 in accordance with the credit agreement amendment NCM entered into with its lenders and as a result of their bankruptcy filing. NCMI also suspended its dividend.

[6] Amounts include the per patron and per digital screen theatre access fees, net of amounts due to NCM for on-screen advertising time provided to the Company’s beverage concessionaire. The amounts due to NCM for on-screen advertising time provided to the Company’s beverage concessionaire were approximately $4.9, $7.5 and $8.9 for the years ended December 31, 2021, 2022 and 2023, respectively. Amounts unpaid and reflected in accounts receivable were $4.9 and $4.9 as of December 31, 2022 and 2023, respectively.