Schedule of Components of Lease Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finance lease cost
Amortization of right-of-use assets and interest	$ 0.6	$ 1.1	$ 0.9
Operating lease cost	23.4	17.5	15.5
Short-term lease cost	2.7	3.7	2.4
Variable lease cost	2.9	2.4	1.2
Total lease cost	$ 29.6	$ 24.7	$ 20.0