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Environmental Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Environmental reserves, long-term |  |  |  |  | $ 310.0 | $ 346.2
Environmental loss contingencies, net of expected recoveries, in excess of accrual |  |  | $ 210.0 |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |  |
Environmental charges, net | $ 2.4 | $ 2.7 | 9.2 | $ 8.3 |  |
Environmental provision, net | 7.4 | 31.9 | 20.6 | 52.7 |  |
Continuing Operations |  |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |  |
Environmental charges, net | 2.4 | 2.7 | 9.2 | 8.3 |  |
Discontinued Operations |  |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |  |
Environmental charges, net | 5.0 | 29.2 | 11.4 | 44.4 |  |
Other Assets Including Long-term Receivables, Net |  |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |  |
Environmental Recoveries, beginning |  |  | 32.3 |  |  |
Increase in recoveries |  |  | 0.4 |  |  |
Cash received |  |  | (4.2) |  |  |
Environmental Recoveries, ending | 28.5 |  | 28.5 |  |  |
Other Liabilities |  |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |  |
Environmental remediation provision, net | 7.8 | 31.9 | 21.0 | 53.1 |  |
Other Assets |  |  |  |  |  |
Recorded Recoveries [Roll Forward] |  |  |  |  |  |
Environmental remediation provision, net | (0.4) | $ 0.0 | (0.4) | $ (0.4) |  |
Gross |  |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Total environmental reserves at December 31, 2017 |  |  | 432.1 |  |  |
Provision (Benefit) |  |  | 21.0 |  |  |
(Spending) Recoveries |  |  | (31.4) |  |  |
Foreign currency translation adjustments |  |  | (0.9) |  |  |
Net change |  |  | (11.3) |  |  |
Total environmental reserves at September 30, 2018 | 420.8 |  | 420.8 |  |  |
Environmental reserves, current |  |  |  |  | 98.9 |
Environmental reserves, long-term |  |  |  |  | 321.9 |
Total environmental reserves, net of recoveries at end of period | 420.8 |  | 432.1 |  | 420.8 | 432.1
Recoveries |  |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Total environmental reserves at December 31, 2017 |  |  | 13.9 |  |  |
Provision (Benefit) |  |  | 0.0 |  |  |
(Spending) Recoveries |  |  | 0.0 |  |  |
Foreign currency translation adjustments |  |  | 0.0 |  |  |
Net change |  |  | 0.0 |  |  |
Total environmental reserves at September 30, 2018 | 13.9 |  | 13.9 |  |  |
Environmental reserves, current |  |  |  |  | 2.0 |
Environmental reserves, long-term |  |  |  |  | 11.9 |
Total environmental reserves, net of recoveries at end of period | 13.9 |  | 13.9 |  | 13.9 | 13.9
Net |  |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Total environmental reserves at December 31, 2017 |  |  | 418.2 |  |  |
Provision (Benefit) |  |  | 21.0 |  |  |
(Spending) Recoveries |  |  | (31.4) |  |  |
Foreign currency translation adjustments |  |  | (0.9) |  |  |
Net change |  |  | (11.3) |  |  |
Total environmental reserves at September 30, 2018 | 406.9 |  | 406.9 |  |  |
Environmental reserves, current |  |  |  |  | 96.9 |
Environmental reserves, long-term |  |  |  |  | 310.0 |
Total environmental reserves, net of recoveries at end of period | $ 406.9 |  | $ 418.2 |  | $ 406.9 | $ 418.2

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