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Environmental Obligations - Recoveries and Reserves (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Recorded Recoveries [Roll Forward] |  |  |  |  |
Beginning balance | $ 37.3 | $ 37.3 | $ 38.4 |  |
Increase (Decrease) in Recoveries |  | (0.9) | 2.9 |  |
Cash Received |  | (21.7) | (4.3) |  |
Other |  |  | 0.3 |  |
Ending balance |  | 14.7 | 37.3 | $ 38.4 |
Litigation settlement | 20.0 |  |  |  |
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract] |  |  |  |  |
Environmental reserves, current, net of recoveries |  | 120.9 | 115.3 |  |
Environmental reserves, long-term continuing and discontinued, net of recoveries |  | 443.5 | 470.5 |  |
Total environmental reserves, net of recoveries |  | 564.4 | 585.8 | 521.5 | $ 411.8
Net Environmental Provisions [Abstract] |  |  |  |  |
Continuing operations |  | 24.9 | 108.7 | 21.7 |
Discontinued operations |  | 30.1 | 29.8 | 153.9 |
Net environmental provision |  | 55.0 | 138.5 | 175.6 |
Net Environmental Provisions, Assets and Liabilities [Abstract] |  |  |  |  |
Environmental reserves |  | 53.2 | 138.8 | 178.2 |
Other assets |  | 1.8 | (0.3) | (2.6) |
Net environmental provision |  | 55.0 | 138.5 | 175.6 |
Other Assets Including Long-term Receivables, Net |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |
Beginning balance | 10.0 | 10.0 | 7.9 |  |
Increase (Decrease) in Recoveries |  | 0.9 | 2.6 |  |
Cash Received |  | (0.6) | (0.5) |  |
Other |  |  | 0.0 |  |
Ending balance |  | 10.3 | 10.0 | 7.9 |
Other assets |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |
Beginning balance | $ 27.3 | 27.3 | 30.5 |  |
Increase (Decrease) in Recoveries |  | (1.8) | 0.3 |  |
Cash Received |  | (21.1) | (3.8) |  |
Other |  |  | 0.3 |  |
Ending balance |  | $ 4.4 | $ 27.3 | $ 30.5 |

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