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Summary of Long-Lived Asset Impairment Losses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Impaired Long Lived Assets Held And Used [Line Items]      
Total impairment $ 174.1 $ 20.8 $ 152.7
Investment In Ncm [Member]      
Impaired Long Lived Assets Held And Used [Line Items]      
Total impairment [1] (113.2)   (92.7)
Us Operating Segment [Member]      
Impaired Long Lived Assets Held And Used [Line Items]      
Theatre properties 19.7 6.4 12.4
Theatre operating lease right-of-use assets 34.0 6.8 13.2
Other 3.9 0.0 2.5
Total impairment 170.8 13.2 120.8
Us Operating Segment [Member] | Investment In Ncm [Member]      
Impaired Long Lived Assets Held And Used [Line Items]      
Investment [2] 113.2 0.0 92.7
International Operating Segment [Member]      
Impaired Long Lived Assets Held And Used [Line Items]      
Theatre properties 2.2 4.0 10.0
Theatre operating lease right-of-use assets 1.1 3.2 5.0
Impairment 0.0 0.0 16.1
Intangible assets 0.0 0.4 0.8
Total impairment $ 3.3 $ 7.6 $ 31.9
[1] Reflected in impairment of long-lived and other assets on the consolidated income statement for the year indicated. See further discussion at Fair Value of Investment in NCM below.
[2] See discussion at Fair Value of NCM Investment in Note 9.