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Summary Quarterly Financial Information Textuals (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 28, 2017 | Nov. 27, 2017 | Jul. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Recoveries |  |  |  |  |  |  | $ 125.0 |  |  |  |  | $ 0.0 | $ 0.0 | $ 125.0 | $ 0.0
Gain on formation of United Wambo JV |  |  |  | $ 48.1 |  |  |  |  |  |  |  | 0.0 | 0.0 | 48.1 | 0.0
Settlement on Coal Supply Agreement Termination |  |  |  | 69.3 | $ 14.0 |  |  |  |  |  |  |  |  |  |
Acquisition costs related to Arch Joint Venture |  |  |  | 11.8 | 8.2 |  |  | $ 4.9 |  |  |  | 0.0 | 0.0 | 21.6 | 7.4
Asset impairment |  |  |  | 250.2 | 20.0 |  |  |  |  |  |  | 30.5 | 0.0 | 270.2 | 0.0
Provision for North Goonyella equipment loss |  |  |  | 58.5 |  |  | 24.7 | 17.1 | $ 49.3 |  |  | 0.0 | 0.0 | 83.2 | 66.4
Restructuring charges | $ 3.0 |  |  | 23.0 |  |  |  |  |  |  |  | 0.0 | 7.6 | 24.3 | 1.2
Income (Loss) from Equity Method Investments |  |  |  | 10.9 | 20.7 | $ 9.7 |  |  | 17.2 | $ 25.2 | $ 22.0 | 15.0 | 49.0 | 3.4 | 68.1
Interest expense |  |  |  | 36.8 | 35.4 | 36.0 | 35.8 | 36.5 | 38.2 | 38.3 | 36.3 | 32.9 | 119.7 | 144.0 | 149.3
Investment Income, Interest |  |  |  | 4.5 | $ 7.0 | $ 7.2 | $ 8.3 | 9.3 | 10.1 | $ 7.0 | 7.2 | 2.7 | 5.6 | 27.0 | 33.6
Net mark-to-market adjustment on actuarially determined liabilities |  |  |  | $ 67.4 |  |  |  | $ 125.5 |  |  |  | 0.0 | (45.2) | 67.4 | (125.5)
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  | 20.7 |  | 30.6 | 22.8 | 84.0 | 2.1 | 48.2
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  | 30.5 | 0.0 | 270.2 | 0.0
Reorganization items, net |  |  |  |  |  |  |  |  |  |  | 12.8 | 627.2 | 0.0 | 0.0 | (12.8)
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (20.9) | (0.2) | (2.0)
Burton Mine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  | $ 52.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 52.2 | 0.0 | 0.0
Springfield Reclamation Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  |  |  | 31.2 |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 31.2 | $ 0.0 | $ 0.0
Iffley Land Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  | $ 20.6 |  |  |  |
Stanmore Coal Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ 20.5 |  |  |  |  |  | $ 20.5 |  |  |  |  |  |

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