Leases - Schedule Of Supplemental Cash Flow Related To Leases (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 94.1
Operating cash flows from finance leases	0.3
Financing cash flows from finance leases	1.7
Right of use assets obtained in exchange for lease liabilities:
Operating leases	100.6
Finance leases	$ 6.7