Segments - Holdings - Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 874.8	$ 650.4	$ 2,427.8	$ 1,855.0
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	874.8	650.4	2,427.8	1,855.0
Theatre properties and equipment	1,154.4		1,154.4		$ 1,232.1
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	686.2	514.4	1,907.2	1,491.6
Theatre properties and equipment	1,008.5		1,008.5		1,075.3
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	70.3	45.2	183.5	133.1
Theatre properties and equipment	51.7		51.7		49.5
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	122.0	93.5	347.8	237.4
Theatre properties and equipment	94.2		94.2		$ 107.3
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (3.7)	$ (2.7)	$ (10.7)	$ (7.1)