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Business Combinations, Dispositions and Related Transactions - Schedule of Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Income tax benefit $ (67.1) $ (12.6) $ (10.1)
Net loss (109.2) (24.0) (21.7)
Waste Management      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Net sales 75.4 47.4 45.0
Operating loss (167.1) (26.2) (26.5)
Other income (expense), net (4.4) (5.3) 0.1
Interest expense, net (4.8) (5.1) (5.4)
Loss before taxes (176.3) (36.6) (31.8)
Income tax benefit (67.1) (12.6) (10.1)
Net loss (109.2) (24.0) (21.7)
Net cash provided by (used in) operating activities 18.1 (10.7) (12.2)
Net cash provided by (used in) investing activities $ (3.4) $ (2.7) $ 0.8