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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Successor |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of income taxes |  | $ 233.5 | $ 83.9 | $ 120.0 | $ 208.3 | $ 378.0 | $ 233.7 | $ 101.4 |  |  | $ 713.1 | $ 645.7 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 521.6 | 679.0 |
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  | 41.2 | 53.0 |
Selling and administrative expenses related to debt restructuring |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Asset impairment |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Provision for North Goonyella equipment loss |  | 17.1 | 49.3 |  |  |  |  |  |  |  | 0.0 | 66.4 |
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates |  |  |  |  |  |  |  |  |  |  | (17.3) | (18.3) |
Interest expense |  |  |  |  |  |  |  |  |  |  | 119.7 | 149.3 |
Loss on early debt extinguishment |  |  |  |  |  | (8.0) | $ (12.9) |  |  |  | 20.9 | 2.0 |
Interest income |  | (9.3) | $ (10.1) | $ (7.0) | (7.2) |  |  |  |  |  | (5.6) | (33.6) |
Net mark-to-market adjustment on actuarially determined liabilities |  | $ 125.5 |  |  |  | 45.2 |  |  |  |  | (45.2) | (125.5) |
Reorganization items, net |  |  |  |  | $ 12.8 |  |  |  |  |  | 0.0 | (12.8) |
Break fees related to terminated asset sales |  |  |  |  |  |  |  |  |  |  | (28.0) | 0.0 |
Unrealized (gains) losses on economic hedges |  |  |  |  |  |  |  |  |  |  | 23.0 | (18.3) |
Unrealized losses on non-coal trading derivative contracts |  |  |  |  |  |  |  |  |  |  | 1.5 | 0.7 |
Fresh start coal inventory revaluation |  |  |  |  |  |  |  |  |  |  | 67.3 | 0.0 |
Fresh start take-or-pay contract-based intangible recognition |  |  |  |  |  |  |  |  |  |  | (22.5) | (26.7) |
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | (161.0) | 18.4 |
Total Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  | 1,145.3 | 1,379.3 |
Successor | Springfield Reclamation Liability |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposals |  |  |  |  |  | (31.2) |  |  |  |  | (31.2) | 0.0 |
Successor | Burton Mine |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposals |  |  |  |  |  | $ (52.2) |  |  |  |  | $ (52.2) | $ 0.0 |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of income taxes | $ (319.8) |  |  |  |  |  |  |  | $ (195.5) | $ 124.3 |  |  | $ (663.8)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 119.9 |  |  |  | 465.4
Asset retirement obligation expenses |  |  |  |  |  |  |  |  | 14.6 |  |  |  | 41.8
Selling and administrative expenses related to debt restructuring |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 21.5
Asset impairment |  |  |  |  |  |  |  |  | 30.5 |  |  |  | 247.9
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates |  |  |  |  |  |  |  |  | (5.2) |  |  |  | (7.5)
Interest expense |  |  |  |  |  |  |  |  | 32.9 |  |  |  | 298.6
Loss on early debt extinguishment |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 29.5
Interest income |  |  |  |  |  |  |  |  | (2.7) |  |  |  | (5.7)
Net mark-to-market adjustment on actuarially determined liabilities |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Reorganization items, net | $ 585.8 |  |  |  |  |  |  |  | 627.2 | $ 41.4 |  |  | 159.0
Break fees related to terminated asset sales |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Unrealized (gains) losses on economic hedges |  |  |  |  |  |  |  |  | (16.6) |  |  |  | 39.8
Unrealized losses on non-coal trading derivative contracts |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Fresh start coal inventory revaluation |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Fresh start take-or-pay contract-based intangible recognition |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (263.8) |  |  |  | (94.5)
Total Adjusted EBITDA |  |  |  |  |  |  |  |  | 341.3 |  |  |  | 532.0
Predecessor | Springfield Reclamation Liability |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposals |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0
Predecessor | Burton Mine |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposals |  |  |  |  |  |  |  |  | $ 0.0 |  |  |  | $ 0.0

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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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