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Investments in National CineMedia Inc. and Other Affiliates - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule Of Equity Method Investments [Line Items]
Estimated fair value of additional common units received			$ 0.0	$ 0.5
NCM
Schedule Of Equity Method Investments [Line Items]
Amounts recognized as accounts receivable			1.6		$ 2.1
Recognized incremental screen rental revenue and offsetting interest expense			16.0	16.5
Amortization of screen advertising advances			24.4	24.3
Company's beverage concessionaire advertising costs			6.7	6.4
Investment In NCM | NCM
Schedule Of Equity Method Investments [Line Items]
Amortization of screen advertising advances			16.2	16.3
Investment In NCMI
Schedule Of Equity Method Investments [Line Items]
Unrealized gain (loss)	$ 1.5	$ 11.6	(9.3)	$ 12.7
Amortization of screen advertising advances			$ 0.0

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