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INTERIM FINANCIAL INFORMATION - Basis of Presentation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business And Organization          
Selling, general and administrative expenses $ 376.7 $ 237.2 $ 695.2 $ 565.1  
Additional paid-in capital 313.6   313.6   $ 308.3
Net income (loss) $ 191.0 $ 30.2 $ 292.9 $ 60.0  
Decrease to diluted earnings per common share (in dollars per share) $ (10.35) $ (1.63) $ (15.88) $ (3.25)  
Restatement Adjustment          
Business And Organization          
Selling, general and administrative expenses $ 10.6        
Additional paid-in capital   $ 10.6   $ 10.6  
Net income (loss) $ (9.7)        
Decrease to diluted earnings per common share (in dollars per share) $ 0.53