Quarterly report pursuant to Section 13 or 15(d)

Summary of Impairment Charges (Detail)

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Summary of Impairment Charges (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
Impaired Long-Lived Assets Held and Used [Line Items]          
U.S. total $ 1,296.0   $ 1,296.0   $ 1,382.9
Total Impairment $ 92.3 $ 0.0 92.3 $ 0.0  
U.S. Operating Segment          
Impaired Long-Lived Assets Held and Used [Line Items]          
Theatre properties     2.5    
Theatre operating lease right-of-use assets     2.0    
Investment in NCM [1]     86.8    
Total Impairment     91.3    
International          
Impaired Long-Lived Assets Held and Used [Line Items]          
Theatre properties     0.7    
Theatre operating lease right-of-use assets     0.3    
Total Impairment     $ 1.0    
[1] See discussion at Impairment of NCM Investment in Note 8.