Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee Lease Description [Line Items]
Finance lease, right-of-use asset	$ 0.0		$ 0.0
Finance lease, liability	0.0		$ 0.0
Operating lease, option to extend			true
Operating lease, option to extend, description			some of which may include options to extend the leases for up to 5 years
Operating lease, option to terminate			true
Operating lease, option to terminate, description			options to terminate the leases within 1 year
Operating lease, option to terminate, term			1 year
Operating lease expense	25.9	$ 25.5	$ 52.2	$ 38.3
Cost for short-term, cancellable and variable leases	$ 7.6	$ 5.8	$ 15.4	$ 9.4
Maximum [Member]
Lessee Lease Description [Line Items]
Operating leases remaining lease terms	9 years		9 years
Operating lease, option to extend term			5 years