Commitments and Contingencies - Components of Lease Cost, Supplemental Cash Flow and Other Information Related to Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lease, Cost [Abstract]
Operating lease cost	$ 46.8	$ 37.2
Sublease income	(0.9)	(1.0)
Total lease cost	45.9	36.2
Operating cash flows from operating leases	47.3	41.5
Right-of-use assets obtained in exchange for lease obligations	$ 19.3	$ 12.2
Weighted-average remaining lease term of operating leases (years)	3 years 8 months 12 days	4 years 1 month 6 days
Weighted-average discount rate of operating leases	4.40%	5.10%