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Discontinued Operations Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015 | Oct. 31, 2007
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |
Potential exposure from Patriot bankruptcy |  |  |  |  |  |  |  | $ 150.0
Patriot Bankruptcy Liability | $ 85.7 | $ 102.7 |  |  | 85.7 | 102.7 |  |
Net mark-to-market adjustment on actuarially determined liabilities | (67.4) | (125.5) | 0.0 | 45.2 | (67.4) | 125.5 |  |
Estimated fund obligation |  |  |  |  |  |  |  | $ 40.0
Amount contributed to the Combined Benefit Fund |  |  | 0.6 | 1.7 | 1.9 | 2.2 |  |
Combined Benefit Fund Lower Estimate |  |  |  |  | 1.0 |  |  |
Combined Benefit Fund Future Estimate |  |  |  |  | 2.0 |  |  |
Combined Benefit Fund Liability | $ 15.2 | $ 16.4 |  |  | 15.2 | 16.4 |  |
Payment to the VEBA based on the construct of the negotiated settlement |  |  |  |  |  |  | $ 75.0 |
Income (loss) from discontinued operations, net of income taxes |  |  | (16.2) | (19.8) | 3.2 | 18.1 |  |
Combined benefit fund |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Loss from discontinued operations before income taxes |  |  | $ 0.2 | 0.6 | 0.7 | 0.7 |  |
Patriot Coal Corporation |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net mark-to-market adjustment on actuarially determined liabilities |  |  |  | $ (7.9) | 18.3 | 33.7 |  |
United Mine Workers of America |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of income taxes |  |  |  |  | $ 26.0 | $ 36.7 |  |

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