Segments - Holdings - Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 579.2	$ 610.7
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	579.2	610.7
Theatre properties and equipment, net	1,159.7		$ 1,161.7
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	459.1	481.7
Theatre properties and equipment, net	1,006.2		1,002.1
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	54.3	44.5
Theatre properties and equipment, net	51.9		54.7
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	67.9	87.1
Theatre properties and equipment, net	101.6		$ 104.9
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (2.1)	$ (2.6)