Segments - Holdings - Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 942.3	$ 744.1	$ 1,553.0	$ 1,204.6
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	942.3	744.1	1,553.0	1,204.6
Theatre properties and equipment, net	1,187.9		1,187.9		$ 1,232.1
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	739.3	603.5	1,221.0	977.2
Theatre properties and equipment, net	1,030.4		1,030.4		1,075.3
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	68.7	54.8	113.2	87.9
Theatre properties and equipment, net	53.6		53.6		49.5
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	138.7	88.5	225.8	143.9
Theatre properties and equipment, net	103.9		103.9		$ 107.3
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (4.4)	$ (2.7)	$ (7.0)	$ (4.4)