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Income Tax Provision - Reconciliation Between Effective Tax Rate and Statutory Rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
U.S. federal income tax provision (benefit) at statutory rate $ 1.0 $ 20.2 $ 20.4
Adjustments:      
State and local income taxes, net of federal tax benefit 0.0 4.2 8.4
Permanent differences 1.9 1.2 8.9
Foreign earnings taxed at different rates 0.1 0.0 (3.6)
Valuation allowance (0.5) 1.8 (2.5)
U.S. research tax credit (0.1) (0.3) (0.6)
Other items, net 1.0 (0.1) 1.0
Provision (benefit) for incomes taxes $ 3.3 $ 27.0 $ 32.0
Effective tax rate 72.20% 28.00% 32.90%