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Business Combinations, Dispositions and Related Transactions - Schedule of Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Total $ (4.6) $ 0.7 $ 0.4 $ 37.6 $ 34.1 $ (109.2)
Waste Management            
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Net sales         4.6 75.4
Operating loss         (0.4) (167.1)
Termination fee           4.0
Other expense, net           (8.4)
Interest expense, net         (0.3) (4.8)
Loss before taxes         (0.7) (176.3)
Income tax benefit         (0.1) (67.1)
Net loss         (0.6) (109.2)
Pre-tax gain on disposal         58.4  
Income tax expense         23.7  
After-tax gain on disposal         34.7  
Total         34.1 (109.2)
Net cash provided by operating activities         2.3 18.1
Net cash used in investing activities         $ (0.1) $ (3.4)