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Income Taxes - Income Tax Expense and Income Before Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes      
Current income taxes (benefits): U.S. federal $ 81.5 $ (56.3) $ 110.3
Current income taxes (benefits): State 20.1 20.7 19.4
Current income taxes (benefits): Foreign 38.8 53.1 38.0
Current income taxes (benefits): Tax benefit of operating loss carryforwards (14.5) (9.5) (1.2)
Total current income taxes (benefits) 125.9 8.0 166.5
Deferred income taxes (benefits): U.S. federal (63.2) 1,189.7 118.0
Deferred income taxes (benefits): State 0.1 8.0 16.6
Deferred income taxes (benefits): Foreign 5.9 (16.2) (17.2)
Total deferred income taxes (benefits) (57.2) 1,181.5 117.4
Income taxes (benefits) 68.7 1,189.5 283.9
Income (loss) before income taxes      
Income (loss) before income taxes - domestic 412.8 5,766.1 1,715.2
Income (loss) before income taxes - foreign 326.0 220.9 195.7
Income (loss) before income taxes $ 738.8 $ 5,987.0 $ 1,910.9