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Earnings Per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator      
Net income (controlling interest) $ 672.9 $ 1,145.9 $ 565.7
Income from hypothetical settlement of Redeemable non-controlling interests, net of tax 49.0 82.9 0.0
Interest expense on junior convertible securities, net of taxes 13.4 14.0 18.5
Net income (controlling interest), as adjusted $ 735.3 $ 1,242.8 $ 584.2
Denominator      
Average shares outstanding (basic) (in shares) 35.1 38.5 41.5
Effect of dilutive instruments:      
Stock options and restricted stock units (in shares) 1.7 1.3 1.2
Hypothetical issuance of shares to settle Redeemable non-controlling interests (in shares) 3.7 7.4 0.0
Junior convertible securities (in shares) 1.7 1.8 2.1
Average shares outstanding (diluted) (in shares) 42.2 49.0 44.8