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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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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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