Goodwill and Other Intangible Assets - Estimated Amortization Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Line Items]
Amortization of intangible assets	$ 5.9	$ 6.0	$ 17.9	$ 15.9
Estimated Future Amortization Expense by Fiscal Year [Abstract]
Remainder 2025	6.0		6.0
2026	23.9		23.9
2027	23.9		23.9
2028	23.9		23.9
2029	23.9		23.9
2030	$ 23.9		$ 23.9