v3.20.4
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment of assets (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES                
Impairment of long-lived assets           $ 177.9 $ 84.3 $ 13.8
Impairment of definite-lived intangible assets           14.4    
Impairment of indefinite-lived intangible assets           15.2 0.0 0.0
Impairment of goodwill $ 0.0 $ 405.3 $ 156.8   $ 1,744.3 2,306.4    
Impairment of long-lived assets, definite and indefinite-lived intangible assets and goodwill   $ 466.1 $ 195.9 $ 0.0 $ 1,851.9 2,513.9 84.3 13.8
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  
Total impairment loss           $ 2,538.4 $ 87.9 $ 13.8