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Resource Management, Acquisitions and Other Commercial Events (Details) T in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 28, 2017 USD ($) T | Nov. 27, 2017 USD ($) | Dec. 31, 2017 USD ($) | Apr. 01, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 29, 2017 USD ($) | Nov. 30, 2016 USD ($)
Predecessor |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  | $ 0.0 |  |  |  | $ 15.5 | $ 23.5 |  |
Increase (Decrease) in Asset Retirement Obligations |  |  |  | 10.2 |  |  |  | 13.1 | 23.9 |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  | 24.3 |  |  |  | 144.4 | 70.4 |  |
Gain (Loss) on Disposition of Assets |  |  |  | 22.8 |  | $ 13.7 |  | 23.2 | 45.0 |  |
Predecessor | Springfield Reclamation Liability [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 |  |
Predecessor | Burton Mine [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 |  |
Predecessor | DTA and PBGC [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  | 37.50% |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  | $ 20.5 |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  | $ 19.7 |  |  |  |  |  |  |
Predecessor | Metropolitan Collieries Pty Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Planned Divestiture, Agreed Upon Proceeds from Divestiture |  |  |  |  |  |  |  |  |  |  | $ 200.0
Predecessor | Priairie State Campus [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  | 57.1 |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  | 6.2 |  |  |
Predecessor | Nonstrategic Australian mining tenement [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  | 64.1 |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  | $ 2.8 |  |  |  |  |
Predecessor | Olive Downs South Mining Tenement [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  | $ 2.8 |  |  |
Predecessor | New Mexico/Colorado Mining Tenement [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 358.0 |  |
Successor |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges | $ 3.0 |  |  |  |  |  | $ 7.6 |  |  |  |
Coal Reserves, in tons | T | 345 |  |  |  |  |  |  |  |  |  |
Reclamation and Mine Shutdown Provision | $ 34.2 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Asset Retirement Obligations |  |  |  |  |  |  | 12.1 |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  | 17.9 |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ 83.1 |  |  |  | $ 84.0 |  |  |  |
Interest in unincorporated joint venture project |  |  | 50.00% |  |  |  | 50.00% |  |  |  |
Successor | Springfield Reclamation Liability [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  | $ 31.2 |  |  |  | $ (31.2) |  |  |  |
Gain (Loss) on Disposition of Assets | $ 31.2 |  |  |  |  |  |  |  |  |  |
Successor | Burton Mine [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  | $ 52.2 |  |  |  | (52.2) |  |  |  |
Gain (Loss) on Disposition of Assets |  | $ 52.2 |  |  |  |  |  |  |  |  |
Successor | New Mexico/Colorado Mining Tenement [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Contract Termination |  |  |  |  |  |  | $ 20.0 |  |  |  |
Successor | Lenton Joint Venture [Member] | Burton Mine [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Planned Divestiture, Agreed Upon Proceeds from Divestiture |  | 11.7 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Asset Retirement Obligations |  | 40.5 |  |  |  |  |  |  |  |  |
Decrease in Restricted Cash |  | $ 30.0 |  |  |  |  |  |  |  |  |
Successor | BHP Billiton Mitsui Coal Pty Ltd [Member] | Red Mountain Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Planned Divestiture, Agreed Upon Proceeds from Divestiture |  |  |  |  |  |  |  |  |  | $ 20.0 |
Ownership Percentage In Subsidiaries |  |  |  |  |  |  |  |  |  | 50.00% |
Prarie State Energy Campus [Member] | Predecessor |  |  |  |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Undivided Interest Percent Of New Electricity Generation Project |  |  | 5.06% |  |  |  | 5.06% |  |  |  |

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