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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, 2022
Mar. 31, 2021
Numerator    
Net income (controlling interest) $ 146.0 $ 149.9
Income from hypothetical settlement of Redeemable non-controlling interests, net of taxes 11.7 0.0
Interest expense on junior convertible securities, net of taxes 3.8 4.7
Net income (controlling interest), as adjusted $ 161.5 $ 154.6
Denominator    
Average shares outstanding (basic) (in shares) 39.7 42.6
Effect of dilutive instruments:    
Stock options and restricted stock units (in shares) 1.2 0.6
Issuance of shares to settle Redeemable non-controlling interests (in shares) 4.0 0.0
Junior convertible securities (in shares) 2.0 2.2
Average shares outstanding (diluted) (in shares) 46.9 45.4