Leases - Other Information Related to Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 48.0	$ 43.5	$ 41.3
Right-of-use assets obtained in exchange for operating lease obligations	$ 69.7	$ 40.5	$ 24.5
Weighted average remaining lease term - operating leases	6 years 1 month 6 days	6 years 4 months 24 days	7 years 1 month 6 days
Weighted average discount rate - operating leases	3.30%	3.80%	4.20%