Leases - Schedule Of Supplemental Cash Flow Related To Leases (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 148.3
Operating cash flows from finance leases	0.5
Financing cash flows from finance leases	2.7
Right of use assets obtained in exchange for lease liabilities:
Operating leases	123.5
Finance leases	$ 6.7