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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator      
Net income (controlling interest) $ 511.6 $ 672.9 $ 1,145.9
Income from hypothetical settlement of Redeemable non-controlling interests, net of tax 20.5 49.0 82.9
Interest expense on junior convertible securities, net of taxes 13.4 13.4 14.0
Net income (controlling interest), as adjusted $ 545.5 $ 735.3 $ 1,242.8
Denominator      
Average shares outstanding (basic) (in shares) 31.1 35.1 38.5
Effect of dilutive instruments:      
Stock options and restricted stock units (in shares) 1.7 1.7 1.3
Hypothetical issuance of shares to settle Redeemable non-controlling interests (in shares) 1.6 3.7 7.4
Junior convertible securities (in shares) 1.7 1.7 1.8
Average shares outstanding (diluted) (in shares) 36.1 42.2 49.0