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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current      
Federal income tax $ 186.0 $ 263.6 $ 351.3
State and local income tax 29.1 30.4 59.6
Foreign income tax 46.2 55.6 56.5
Total current 261.3 349.6 467.4
Deferred      
Federal income tax (333.4) (25.1) 450.7
State and local income tax (26.0) (3.3) 48.9
Foreign income tax (6.1) (33.4) 15.3
Total deferred (365.5) (61.8) 514.9
Total provision (benefit) for income taxes $ (104.2) $ 287.8 $ 982.3