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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator        
Net income (controlling interest) $ 109.0 $ 30.7 $ 258.9 $ 15.1
Interest expense on junior convertible securities, net of taxes 4.6 0.0 9.4 0.0
Net income (controlling interest), as adjusted $ 113.6 $ 30.7 $ 268.3 $ 15.1
Denominator        
Average shares outstanding (basic) (in shares) 41.6 47.2 42.1 47.5
Effect of dilutive instruments:        
Stock options and restricted stock units (in shares) 0.9 0.1 0.8 0.1
Junior convertible securities (in shares) 2.1 0.0 2.1 0.0
Average shares outstanding (diluted) (in shares) 44.6 47.3 45.0 47.6