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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ (37.6) $ (13.2) $ (0.4)
State (14.6) (15.3) (0.7)
Foreign (10.7) (7.5) (2.5)
Deferred:      
Federal (23.0) 386.7 2.2
State 2.7 30.0 0.4
Foreign (17.6) (20.2) 37.5
(Provision for) benefit from income taxes [1] $ (100.8) $ 360.5 $ 36.5
[1] Results of Operations for the year ended December 31, 2022 includes a one-time benefit from income taxes of $420.2 million due to the release of a valuation allowance on the U.S. federal and certain state deferred tax assets. Results of Operations for the year ended December 31, 2021 includes a one-time benefit from income taxes of $38.1 million from the release of a valuation allowance on the Irish deferred tax assets.