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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment narratives (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
item
Impairment losses      
Impairment of long-lived assets $ 106.9 $ 133.1 $ 77.2
Impairment of other assets recorded in investment expense (income) 1.0    
Impairment of indefinite-lived intangible assets 0.0 0.0 0.0
U.S.      
Impairment losses      
Impairment of long-lived assets $ 49.2 $ 73.4 $ 61.3
Tangible asset impairment, number of theatres | item 68 68 77
Tangible asset impairment, number of screens | item 738 817 805
International markets      
Impairment losses      
Impairment of long-lived assets $ 57.7 $ 59.7 $ 15.9
Tangible asset impairment, number of theatres | item 57 53 14
Tangible asset impairment, number of screens | item 488 456 118