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Earnings Per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator    
Net income (loss) (controlling interest) $ 149.9 $ (15.6)
Interest expense on junior convertible securities, net of taxes 4.7 0.0
Net income (loss) (controlling interest), as adjusted $ 154.6 $ (15.6)
Denominator    
Average shares outstanding (basic) (in shares) 42.6 47.8
Effect of dilutive instruments:    
Stock options and restricted stock units (in shares) 0.6 0.0
Junior convertible securities (in shares) 2.2 0.0
Average shares outstanding (diluted) (in shares) 45.4 47.8