Schedule of Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 17.0	$ 15.9	$ 16.7
Financing cash flows from finance leases	1.1	1.0	0.6
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	39.5	17.0	8.1
Finance leases	$ 1.3	$ 2.9	$ 0.4