Business Disposition - Schedule of Consolidated Statements of Operations (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total	$ 37.6
Waste Management
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	4.6
Operating loss	(0.4)
Interest expense, net	(0.3)
Loss before taxes	(0.7)
Income tax benefit	0.1
Net loss	(0.6)
Pre-tax gain on disposal	58.4
Income tax expense	20.2
After-tax gain on disposal	38.2
Total	37.6
Net cash provided by operating activities	2.3
Net cash used in investing activities	$ (0.1)