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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Taxes calculated at federal rate $ 34.7 $ 57.6 $ 68.4
State taxes, net of federal benefit (8.3) (6.4) (5.3)
Change in liability for tax positions 6.8 10.7 (0.8)
Foreign income taxed at different rates 8.6 9.5 2.1
Unremitted foreign earnings (1.4) 1.2 0.0
Federal tax credits (14.6) (17.3) 0.0
Valuation allowance 11.4 7.7 0.0
Other items, net (4.4) (4.1) (4.0)
Income tax $ 32.8 $ 58.9 $ 60.4
Federal income tax rates 21.00% 21.00% 21.00%
State taxes, net of federal benefit (5.00%) (2.30%) (1.50%)
Change in liability for tax positions 4.10% 3.90% (0.30%)
Foreign income taxed at different rates 5.20% 3.50% 0.60%
Unremitted foreign earnings (0.80%) 0.40% 0.00%
Federal tax credits (8.80%) (6.30%) 0.00%
Valuation allowance 6.90% 2.80% 0.00%
Other items, net (2.80%) (1.50%) (1.10%)
Income tax 19.80% 21.50% 18.70%