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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator        
Net income (loss) (controlling interest) $ 71.3 $ 86.3 $ 86.3 $ (6.8)
Interest expense on junior convertible securities, net of taxes 0.0 0.0 0.0 0.0
Net income (loss) (controlling interest), as adjusted $ 71.3 $ 86.3 $ 86.3 $ (6.8)
Denominator        
Average shares outstanding (basic) (in shares) 46.3 50.4 47.1 51.1
Effect of dilutive instruments:        
Stock options and restricted stock units (in shares) 0.2 0.0 0.1 0.0
Average shares outstanding (diluted) (in shares) 46.5 50.4 47.2 51.1