Schedule of Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 4.2	$ 12.5
Operating cash flows from finance leases	0.1	0.1
Financing cash flows from finance leases	0.3	0.8
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	0.5	6.7
Finance leases	$ 0.1	$ 0.8