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Segments - Holdings - Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 857.5	$ 921.8	$ 2,338.7	$ 2,235.2
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	857.5	921.8	2,338.7	2,235.2
Theater properties and equipment, net	1,126.2		1,126.2		$ 1,145.1
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	687.0	744.8	1,869.2	1,779.0
Theater properties and equipment, net	969.2		969.2		996.1
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	55.6	70.9	164.5	183.8
Theater properties and equipment, net	53.2		53.2		47.2
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	118.3	109.5	314.2	281.0
Theater properties and equipment, net	103.8		103.8		$ 101.8
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ (3.4)	$ (3.4)	$ (9.2)	$ (8.6)

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