v3.20.4
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment narratives (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Impairment losses        
Impairment of long-lived assets   $ 177.9 $ 84.3 $ 13.8
Impairment of definite-lived intangible assets   14.4    
Impairment of equity method investments recorded in equity in earnings (loss) of non-consolidated entities   8.6    
Impairment of other assets recorded in investment expense (income)   15.9 3.6  
Impairment of indefinite-lived intangible assets   15.2 0.0 0.0
Oden trade name        
Impairment losses        
Impairment of indefinite-lived intangible assets   12.5    
Nordic trade names        
Impairment losses        
Impairment of indefinite-lived intangible assets   2.7    
U.S.        
Impairment losses        
Impairment of long-lived assets $ 84.3 $ 152.5 $ 76.6 $ 13.8
Tangible asset impairment, number of theatres | item 40 101 40 13
Tangible asset impairment, number of screens | item 512 1,139 512 150
International markets        
Impairment losses        
Impairment of long-lived assets   $ 25.4 $ 7.7  
Tangible asset impairment, number of theatres | item 14 37 14 15
Tangible asset impairment, number of screens | item 148 340 148 118