Leases - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
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	23.0	$ 61.3
Cost for short-term, cancellable and variable leases	$ 9.2	$ 18.6
Maximum [Member]
Lessee Lease Description [Line Items]
Operating leases remaining lease terms	10 years	10 years
Operating lease, option to extend term		5 years