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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment narratives (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
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Dec. 31, 2023
USD ($)
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Dec. 31, 2022
USD ($)
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Impairment losses      
Impairment of long-lived assets | $ $ 72.3 $ 106.9 $ 133.1
Impairment of cost method investments recorded in investment expense (income) | $   1.0  
Impairment of indefinite-lived intangible assets | $ 0.0 0.0 0.0
U. S. markets      
Impairment losses      
Impairment of long-lived assets | $ $ 51.9 $ 49.2 $ 73.4
Tangible asset impairment, number of theatres 39 68 68
Tangible asset impairment, number of screens 469 738 817
International markets      
Impairment losses      
Impairment of long-lived assets | $ $ 20.4 $ 57.7 $ 59.7
Tangible asset impairment, number of theatres 23 57 53
Tangible asset impairment, number of screens 188 488 456
U.S. Markets      
Impairment losses      
Impairment of long-lived assets | $ $ 51.9 $ 49.2 $ 73.4
Tangible asset impairment, number of theatres 39 68 68
Tangible asset impairment, number of screens 469 738 817
International Markets      
Impairment losses      
Impairment of long-lived assets | $ $ 20.4 $ 57.7 $ 59.7
Tangible asset impairment, number of theatres 23 57 53
Tangible asset impairment, number of screens 188 488 456