Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				$ (346.0)
Impairment of investment in NCM		$ 92.3	$ 0.0	92.3	$ 0.0
Equity in loss		(5.5)	$ (8.1)	(7.7)	$ (14.9)
Ending Balance		(342.8)		(342.8)
Investment In NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				135.4
Receipt of common units due to annual common unit adjustment ("CUA")				1.3
Impairment of investment in NCM				(86.8)
Equity in loss				(9.7)
Ending Balance		40.2		40.2
N C M Screen Advertising Advances
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				(346.0)
Receipt of common units due to annual common unit adjustment ("CUA")				(1.3)
Interest accrued related to significant financing component	[1]			(11.7)
Amortization of screen advertising advances				16.2
Ending Balance		(342.8)		(342.8)
Equity in Loss
Schedule Of Equity Method Investments [Line Items]
Equity in loss				9.7
Ending Balance		9.7		9.7
Other Revenues
Schedule Of Equity Method Investments [Line Items]
Screen rental revenue earned under ESA	[2]			(9.8)
Amortization of screen advertising advances				(16.2)
Ending Balance		(26.0)		(26.0)
Interest Expense - NCM
Schedule Of Equity Method Investments [Line Items]
Interest accrued related to significant financing component				11.7
Ending Balance		11.7		11.7
Cash Received
Schedule Of Equity Method Investments [Line Items]
Screen rental revenue earned under ESA	[2],[3]			9.8
Ending Balance		$ 9.8		$ 9.8

[1] See Note 8 for the maturity of NCM screen advertising advances as of June 30, 2022.

[2] Amounts include the per patron and per digital screen theatre access fees due to the Company, net of amounts due to NCM for on-screen advertising time provided to the Company’s beverage concessionaire of approximately $3.8.

[3] The Company had a receivable from NCM of $7.1 as of June 30, 2022.