Investment in NCMI/NCM - Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023		Jun. 30, 2022
Schedule Of Equity Method Investments [Line Items]
Impairment of long-lived and other assets		$ 9.4	$ 92.3	$ 10.1		$ 92.3
Investment In NCMI
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				9.6
Equity in income (loss) of affiliates	[1]			(3.2)
Redemption of common units of NCM for common stock of NCMI	[2]			0.0
Unrealized gain on investment in NCMI		9.2		9.2	[2]
Impairment of long-lived and other assets				(0.7)
Ending Balance		14.9		14.9
N C M Screen Advertising Advances
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				(338.2)
Interest accrued related to significant financing component	[3]			(11.4)
Amortization of screen advertising advances				16.2
Ending Balance		(333.4)		(333.4)
Equity in Loss
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				0.0
Equity in income (loss) of affiliates	[1]			(3.2)
Ending Balance		(3.2)		(3.2)
Other Revenue
Schedule Of Equity Method Investments [Line Items]
Beginning Balance	[4]			0.0
Screen rental revenue earned under ESA	[4],[5]			(10.4)
Amortization of screen advertising advances	[4]			(16.2)
Ending Balance	[4]	(26.6)		(26.6)
Interest Expense - NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance	[4]			0.0
Interest accrued related to significant financing component				11.4
Ending Balance		$ 11.4		$ 11.4

[1] Equity in loss is recorded one month in arrears. See Investment in National CineMedia below for discussion of accounting for investment in NCMI.

[2] See Investment in National CineMedia below.

[3] See Note 8 for the maturity of NCM screen advertising advances as of June 30, 2023.

[4] The Company had a receivable from NCM of $10.4 as of June 30, 2023

[5] 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 of approximately $4.5.