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Asset Impairments and Unusual Items - Details (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 30, 2020
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments | $ 7.0 | $ 61.0 |  |  | $ 68.0 | $ 42.0 | $ 38.0 |
Goodwill impairment charges |  |  |  |  |  | 27.0 |  |
Solid waste operations impairment |  |  |  |  |  | 15.0 |  |
(Gain) loss from divestitures, asset impairments and unusual items, net |  |  |  |  | 35.0 | 42.0 | (58.0) |
Gain (loss) on sale of assets |  |  |  |  | 33.0 |  | 96.0 |
Payments made for contingent consideration |  |  |  |  |  | (6.0) |  |
Investment impairment |  |  |  | $ 52.0 |  | 52.0 |  |
Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  | 33.0 |  | 96.0 |
Advanced Disposal [Member] | Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  | 33.0 |  |  |
Divestiture consideration |  |  |  |  |  |  |  | $ 856.0
Refined Coal Facility [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Equity method investments impairment charges |  |  | $ 7.0 |  | 7.0 |  |  |
Energy and Environmental Services [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  | 17.0 |  |
Lamp Tracker Reporting Unit [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  | 8.0 |
Goodwill impairment charges |  |  |  |  |  | 10.0 |  |
Landfill [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  | 20.0 |  | 30.0 |
Landfills and Oil Field Waste Injection Facility [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  | 41.0 |  |  |  |  |  |
Asset fair value |  | 8.0 |  |  |  |  |  |
Energy Services Assets [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset fair value |  | 239.0 |  |  |  |  |  |
Tier 1 [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  | 41.0 |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  | 52.0 |
Other [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  | $ 16.0 |  |  |
Goodwill impairment charges |  |  |  |  |  | $ 27.0 |  |
Gain (loss) on sale of assets |  |  |  |  |  |  | $ 44.0 |
Carrying Value [Member] | Landfill [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  | 12.0 |  |  |  |  |  |
Expected Timing [Member] | Landfill [Member] |  |  |  |  |  |  |  |
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  | $ 8.0 |  |  |  |  |  |

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