Selected Financial Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 744.1	$ 294.6	$ 1,204.6	$ 409.0
Theatre properties and equipment, net of accumulated depreciation of $2,093.8 and $1,985.9	1,296.0		1,296.0		$ 1,382.9
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	744.1	294.6	1,204.6	409.0
Theatre properties and equipment, net of accumulated depreciation of $2,093.8 and $1,985.9	1,296.0		1,296.0		1,382.9
Reportable Geographical Components | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	603.5	269.4	977.2	366.7
Theatre properties and equipment, net of accumulated depreciation of $2,093.8 and $1,985.9	1,131.1		1,131.1		1,208.7
Reportable Geographical Components | Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(54.8)	5.5	87.9	9.9
Theatre properties and equipment, net of accumulated depreciation of $2,093.8 and $1,985.9	53.8		53.8		56.8
Reportable Geographical Components | Other international countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	88.5	19.9	143.9	32.8
Theatre properties and equipment, net of accumulated depreciation of $2,093.8 and $1,985.9	111.1		111.1		$ 117.4
Reportable Geographical Components | Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (2.7)	$ (0.2)	$ (4.4)	$ (0.4)