Segments - Holdings - Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 540.7	$ 579.2
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	540.7	579.2
Theatre properties and equipment, net	1,122.6		$ 1,145.1
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	419.3	459.1
Theatre properties and equipment, net	969.9		996.1
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	49.3	54.3
Theatre properties and equipment, net	51.2		47.2
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	74.3	67.9
Theatre properties and equipment, net	101.5		$ 101.8
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ (2.2)	$ (2.1)