Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	13 years 9 months 18 days
Operating Lease, Cost	$ 25.1	$ 25.1	$ 25.4
Operating Lease, Weighted Average Discount Rate, Percent	3.20%
Capitalized Right of Use Assets during the Period	$ 31.6
Operating Lease, Payments	$ 22.6