Leases - Supplemental 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	$ 26.1	$ 23.1	$ 18.1
Operating cash flows from finance leases	0.0	0.1	0.5
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	$ 7.8	$ 14.9	$ 5.2