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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator        
Net income (controlling interest) $ 217.0 $ 112.6 $ 476.8 $ 368.0
Income from hypothetical settlement of Redeemable non-controlling interests, net of taxes 17.1 5.8 39.4 43.4
Interest expense on junior convertible securities, net of taxes 3.4 3.4 10.1 10.6
Net income (controlling interest), as adjusted $ 237.5 $ 121.8 $ 526.3 $ 422.0
Denominator        
Average shares outstanding (basic) (in shares) 34.9 38.2 35.6 38.8
Effect of dilutive instruments:        
Stock options and restricted stock units (in shares) 1.7 1.3 1.7 1.4
Hypothetical issuance of shares to settle Redeemable non-controlling interests (in shares) 5.1 2.3 3.9 5.7
Junior convertible securities (in shares) 1.7 1.7 1.7 1.9
Average shares outstanding (diluted) (in shares) 43.4 43.5 42.9 47.8