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Earnings Per Share - Reconciliation of the Numerator and Denominator used in the Calculation of Basic and Diluted Earnings per Share (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator      
Net income (controlling interest) $ 202.2 $ 15.7 $ 243.6
Interest expense on junior convertible securities, net of taxes 0.0 0.0 0.0
Net income (controlling interest), as adjusted $ 202.2 $ 15.7 $ 243.6
Denominator      
Average shares outstanding (basic) (in shares) 46.5 50.5 53.6
Effect of dilutive instruments:      
Stock options and restricted stock units (in shares) 0.2 0.1 0.2
Convertible securities (in shares) 0.0 0.0 0.0
Average shares outstanding (diluted) (in shares) 46.7 50.6 53.8