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Environmental Obligations Recoveries and Reserves (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Recorded Recoveries [Roll Forward] |  |  |  |
Expected recoveries recorded, beginning | $ 46.2 | $ 38.6 |  |
Increase (Decrease) in Recoveries | (2.9) | 18.4 |  |
Cash Received | (4.9) | (10.8) |  |
Expected recoveries recorded, ending | 38.4 | 46.2 | $ 38.6 |
Transfer to environmental obligations (from) asset retirement obligations |  | 2.6 |  |
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract] |  |  |  |
Environmental reserves, current, net of recoveries | 63.0 | 71.6 |  |
Environmental reserves, long-term continuing and discontinued, net of recoveries | 458.5 | 340.2 |  |
Total environmental reserves, net of recoveries | 521.5 | 411.8 | 360.4 | $ 334.3
Net Environmental Provisions [Abstract] |  |  |  |
Continuing operations | 21.7 | 16.2 | 36.6 |
Discontinued operations | 153.9 | 76.1 | 36.9 |
Net environmental provision | 175.6 | 92.3 | 73.5 |
Net Environmental Provisions, Assets and Liabilities [Abstract] |  |  |  |
Environmental reserves | 178.2 | 105.6 | 80.8 |
Other assets | (2.6) | (13.3) | (7.3) |
Net environmental provision | 175.6 | 92.3 | 73.5 |
Environmental liabilities, continuing and discontinued |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |
Expected recoveries recorded, beginning | 13.9 | 11.4 |  |
Increase (Decrease) in Recoveries | (5.5) | 2.5 |  |
Cash Received | (0.5) | 0.0 |  |
Expected recoveries recorded, ending | 7.9 | 13.9 | 11.4 |
Other assets |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |
Expected recoveries recorded, beginning | 32.3 | 27.2 |  |
Increase (Decrease) in Recoveries | 2.6 | 15.9 |  |
Cash Received | (4.4) | (10.8) |  |
Expected recoveries recorded, ending | $ 30.5 | $ 32.3 | $ 27.2 |

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