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Segment and Geographic Information Reconciliation of Consolidated Income (Loss), Net of Income Taxes to Adjusted EBITDA (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax, including portion attributable to noncontrolling interest | $ (319.8) |  |  |  | $ (195.5) | $ 124.3 | $ (175.2) | $ (97.7) | $ (223.2) | $ (167.7) |  |  | $ (663.8) | $ (1,783.2)
Depreciation, depletion and amortization |  |  |  |  | 119.9 |  |  |  |  |  |  |  | 465.4 | 572.2
Asset Retirement Obligation, Accretion Expense |  |  |  |  | 14.6 |  |  |  |  |  |  |  | 41.8 | 45.5
Selling and Administrative expenses related to debt restructuring |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 21.5 | 0.0
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 | 0.0
Restructuring Costs and Asset Impairment Charges |  |  |  |  | 30.5 | 30.5 | 230.7 |  |  | $ 17.2 |  |  | 247.9 | 1,277.8
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  | (5.2) |  |  |  |  |  |  |  | (7.5) | 3.9
Interest Income (Expense), Net |  |  |  |  | 32.9 |  |  |  |  |  |  |  | 298.6 | 465.4
Loss on early debt extinguishment |  |  |  |  | 0.0 |  | (29.5) |  |  |  |  |  | 29.5 | 67.8
Interest income |  |  |  |  | (2.7) |  |  |  |  |  |  |  | (5.7) | (7.7)
Derivative Instruments Not Designated as Hedging Instruments, Unrealized Gain (Loss), Net |  |  |  |  | 16.6 |  |  |  |  |  |  |  | (39.8) | 2.2
Fresh-Start Adjustment, Revaluation of Inventory |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 | 0.0
Fresh Start Adjustment, Fair Value Adjustment |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 | 0.0
Reorganization Items | $ 585.8 |  |  |  | 627.2 | $ 41.4 | $ 33.9 | $ 29.7 | $ 95.4 |  |  |  | 159.0 | 0.0
Income Tax (Benefit) Expense |  |  |  |  | (263.8) |  |  |  |  |  |  |  | (94.5) | (207.1)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 341.3 |  |  |  |  |  |  |  | 532.0 | 432.4
Break Fees On Terminated Asset Sales |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 | 0.0
Gain (Loss) on Sale of Commodity Contracts |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 | 0.0
Successor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax, including portion attributable to noncontrolling interest |  | $ 378.0 | $ 233.7 | $ 101.4 |  |  |  |  |  |  | $ 713.1 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 521.6 |  |  |
Asset Retirement Obligation, Accretion Expense |  |  |  |  |  |  |  |  |  |  | 41.2 |  |  |
Selling and Administrative expenses related to debt restructuring |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  |
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net |  | 45.2 |  |  |  |  |  |  |  |  | (45.2) |  |  |
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | (17.3) | $ (2,400.0) |  |
Interest Income (Expense), Net |  |  |  |  |  |  |  |  |  |  | 119.7 |  |  |
Loss on early debt extinguishment |  | (8.0) | $ (12.9) |  |  |  |  |  |  |  | 20.9 |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | (5.6) |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Unrealized Gain (Loss), Net |  |  |  |  |  |  |  |  |  |  | (23.0) |  |  |
Fresh-Start Adjustment, Revaluation of Inventory |  |  |  |  |  |  |  |  |  |  | 67.3 |  |  |
Fresh Start Adjustment, Fair Value Adjustment |  |  |  |  |  |  |  |  |  |  | (22.5) |  |  |
Reorganization Items |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  |
Income Tax (Benefit) Expense |  |  |  |  |  |  |  |  |  |  | (161.0) |  |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 1,145.3 |  |  |
Break Fees On Terminated Asset Sales |  |  |  |  |  |  |  |  |  |  | 28.0 |  |  |
Gain (Loss) on Sale of Commodity Contracts |  |  |  |  |  |  |  |  |  |  | (1.5) |  |  |
Springfield Reclamation Liability [Member] | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 | 0.0
Springfield Reclamation Liability [Member] | Successor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  | 31.2 |  |  |  |  |  |  |  |  | (31.2) |  |  |
Burton Mine [Member] | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  | $ 0.0 |  |  |  |  |  |  |  | $ 0.0 | $ 0.0
Burton Mine [Member] | Successor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  | $ 52.2 |  |  |  |  |  |  |  |  | $ (52.2) |  |  |

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