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Other Events (Details) T in Millions, $ in Millions, $ in Millions			1 Months Ended		3 Months Ended						9 Months Ended	12 Months Ended
	Nov. 28, 2017 USD ($) T	Nov. 27, 2017 USD ($)	Jul. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) T	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 01, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 AUD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 06, 2018	Nov. 30, 2016 USD ($)
Successor
OtherCommercialEvents [Line Items]
Costs Related to North Goonyella Events													$ 58.0
Provision for North Goonyella equipment loss					$ 17.1	$ 49.3					$ 0.0		66.4
Restructuring charges	$ 3.0										7.6		1.2
Coal Reserves, in tons | T	345.0
Reclamation and Mine Shutdown Provision	$ 34.2
Increase (Decrease) in Asset Retirement Obligations											12.1		5.7
Proceeds from Sale of Property, Plant, and Equipment											17.9		76.4
Gain (Loss) on Disposition of Assets						20.7	$ 30.6	$ 83.1			84.0		$ 48.2
Interest in unincorporated joint venture project					50.00%								50.00%	50.00%
Insurance Claim Limit													$ 125.0
Deductible Amount													50.0
Successor | Springfield Reclamation Liability
OtherCommercialEvents [Line Items]
Gain (Loss) on Sale of Properties								31.2			31.2		0.0
Gain (Loss) on Disposition of Assets	$ 31.2
Successor | Burton Mine
OtherCommercialEvents [Line Items]
Gain (Loss) on Sale of Properties								$ 52.2			52.2		0.0
Gain (Loss) on Disposition of Assets		$ 52.2
Successor | Red Mountain Joint Venture
OtherCommercialEvents [Line Items]
Proceeds from Sale of Property, Plant, and Equipment													20.0
Gain (Loss) on Disposition of Assets													7.1
Successor | Queensland’s Bowen Basin
OtherCommercialEvents [Line Items]
Proceeds from Sale of Property, Plant, and Equipment														$ 37.0
Gain (Loss) on Disposition of Assets													20.6
Successor | DTA and PBGC
OtherCommercialEvents [Line Items]
Ownership percentage of equity method investment																	50.00%
Successor | New Mexico/Colorado Mining Tenement
OtherCommercialEvents [Line Items]
Gain (Loss) on Contract Termination											$ 20.0
Successor | Stanmore Coal Limited
OtherCommercialEvents [Line Items]
Coal Reserves, in tons | T				23.0
Proceeds from Sale of Property, Plant, and Equipment				$ 22.0									7.0
Gain (Loss) on Disposition of Assets			$ 20.5			$ 20.5
Successor | Lenton Joint Venture | Burton Mine
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 | Leased Equipment
OtherCommercialEvents [Line Items]
Provision for North Goonyella equipment loss													50.4
Successor | Owned Equipment
OtherCommercialEvents [Line Items]
Provision for North Goonyella equipment loss													$ 16.0
Predecessor
OtherCommercialEvents [Line Items]
Provision for North Goonyella equipment loss									$ 0.0						$ 0.0
Restructuring charges									0.0						15.5
Increase (Decrease) in Asset Retirement Obligations									10.2						13.1
Proceeds from Sale of Property, Plant, and Equipment									24.3						144.4
Gain (Loss) on Disposition of Assets									22.8						23.2
Predecessor | Springfield Reclamation Liability
OtherCommercialEvents [Line Items]
Gain (Loss) on Sale of Properties									0.0						0.0
Predecessor | Burton Mine
OtherCommercialEvents [Line Items]
Gain (Loss) on Sale of Properties									0.0						0.0
Predecessor | DTA and PBGC
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
OtherCommercialEvents [Line Items]
Planned Divestiture, Agreed Upon Proceeds from Divestiture																		$ 200.0
Predecessor | Priairie State Campus
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
OtherCommercialEvents [Line Items]
Proceeds from Sale of Property, Plant, and Equipment															64.1
Predecessor | Olive Downs South Mining Tenement
OtherCommercialEvents [Line Items]
Gain (Loss) on Sale of Properties															$ 2.8
Predecessor | New Mexico/Colorado Mining Tenement
OtherCommercialEvents [Line Items]
Proceeds from Sale of Property, Plant, and Equipment																$ 358.0
Predecessor | Prarie State Energy Campus
OtherCommercialEvents [Line Items]
Undivided Interest Percent Of New Electricity Generation Project															5.06%
Scenario, Forecast
OtherCommercialEvents [Line Items]
Costs Related to North Goonyella Events												$ 285.0
Scenario, Forecast | Leased Equipment
OtherCommercialEvents [Line Items]
Costs Related to North Goonyella Events												$ 16.0

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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