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Income Taxes - Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Balance $ 70.4 $ 5.9 $ 6.4
Tax position taken in current year 0.4 68.6 0.2
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 10.4 0.1 0.7
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 0.3 3.1 0.0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 0.0 0.9 0.0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 10.4 68.4  
Balance 80.9 70.4 $ 5.9
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 1.5 $ 0.4  
Unrecognized Tax Benefits, Income Tax Penalties Expense 0.2    
Unrecognized Tax Benefits, Period Increase (Decrease) $ 26.0