Leases - Schedule of Cash Flow Items are Included on Condensed Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating cash used for operating leases	$ 3.0	$ 9.1
Operating cash used for finance leases	0.1	0.2
Financing cash used for finance leases	$ 0.4	$ 1.3