Investment in National CineMedia Inc. - Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023
Schedule Of Equity Method Investments [Line Items]
Impairment of long-lived and other assets		$ 0.0	$ 2.0	$ 0.0		$ 12.1
Investment In NCMI
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				18.1
Screen rental revenue earned under ESA	[1]			0.0
Interest accrued related to significant financing component				0.0
Receipt of common units due to annual common unit adjustment	[2]			0.0
Net gain on investment in NCMI		11.6	$ 4.7	12.7	[3]	$ 13.9
Amortization of screen advertising advances				0.0
Ending Balance		30.8		30.8
N C M Screen Advertising Advances
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				(328.4)
Screen rental revenue earned under ESA	[1]			0.0
Interest accrued related to significant financing component				(16.5)
Receipt of common units due to annual common unit adjustment	[2]			(0.5)
Net gain on investment in NCMI	[3]			0.0
Amortization of screen advertising advances				24.3
Ending Balance		(321.1)		(321.1)
Other Revenue
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				0.0
Screen rental revenue earned under ESA	[1]			(16.3)
Interest accrued related to significant financing component				0.0
Receipt of common units due to annual common unit adjustment	[2]			0.0
Net gain on investment in NCMI	[3]			0.0
Amortization of screen advertising advances				(24.3)
Ending Balance		(40.6)		(40.6)
Interest Expense - NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance				0.0
Screen rental revenue earned under ESA	[1]			0.0
Interest accrued related to significant financing component				16.5
Receipt of common units due to annual common unit adjustment	[2]			0.0
Net gain on investment in NCMI	[3]			0.0
Amortization of screen advertising advances				0.0
Ending Balance		16.5		16.5
Cash Received
Schedule Of Equity Method Investments [Line Items]
Beginning Balance	[4]			0.0
Screen rental revenue earned under ESA	[1],[4]			14.7
Interest accrued related to significant financing component	[4]			0.0
Receipt of common units due to annual common unit adjustment	[2],[4]			0.0
Net gain on investment in NCMI	[3],[4]			0.0
Amortization of screen advertising advances	[4]			0.0
Ending Balance	[4]	$ 14.7		$ 14.7

[1] 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 $6.4.

[2] See Common Unit Adjustments below.

[3] See Investment in National CineMedia below.

[4] The Company had a receivable from NCM of $1.6 as of September 30, 2024