Segments - Holdings - Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 734.2	$ 942.3	$ 1,313.4	$ 1,553.0
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	734.2	942.3	1,313.4	1,553.0
Theatre properties and equipment, net	1,125.8		1,125.8		$ 1,161.7
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	575.1	739.3	1,034.2	1,221.0
Theatre properties and equipment, net	981.7		981.7		1,002.1
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	58.6	68.7	112.9	113.2
Theatre properties and equipment, net	45.0		45.0		54.7
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	103.6	138.7	171.5	225.8
Theatre properties and equipment, net	99.1		99.1		$ 104.9
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (3.1)	$ (4.4)	$ (5.2)	$ (7.0)