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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

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