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Investments in National CineMedia Inc. and Other Affiliates - Summary of Transactions with Each of the Company's Other Investees (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
AC JV, LLC | Film rentals and advertising
Schedule Of Equity Method Investments [Line Items]
Event fees paid	[1]	$ 9.0	$ 4.4	$ 11.7	$ 11.5
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Content delivery fees paid	[1]	$ 0.2	$ 0.2	$ 0.3	$ 0.3
[1] Included in film rentals and advertising costs on the condensed consolidated statements of income.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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