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Income Taxes - Tax Provision Summary (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current provision        
Federal   $ 47.2 $ 85.0 $ 109.9
State   15.9 18.3 24.5
Foreign   32.0 26.2 52.8
Total current   95.1 129.5 187.2
Deferred provision        
Federal   6.3 (7.7) 11.6
State   2.0 (2.3) 0.4
Foreign   0.0 (0.5) (0.9)
Total deferred   8.3 (10.5) 11.1
Effective income tax provision $ (4.8) $ 103.4 $ 119.0 $ 198.3