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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, 2020 | Dec. 31, 2020 | Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Total | $ 4.3 | $ 4.3 | $ 34.1
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 | $ 4.9 |  | 58.4
Income tax expense |  |  | 23.7
After-tax gain on disposal |  |  | 34.7
Total |  |  | 34.1
Net cash provided by operating activities |  |  | 2.3
Net cash used in investing activities |  |  | $ (0.1)

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