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Management - Labor Relations Labor Relations (Details) T in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 28, 2017 USD ($) T | Jul. 31, 2018 USD ($) | 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 ($) | Dec. 31, 2016 USD ($) | Feb. 06, 2018
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Number of Employees |  |  |  | 7,400 |  |  |  |  |  |  |  | 7,400 | 7,400 |  |
Entity Number Of Hourly Employees |  |  |  | 5,600 |  |  |  |  |  |  |  | 5,600 | 5,600 |  |
Percentage of hourly employees represented by organized labor unions |  |  |  | 42.00% |  |  |  |  |  |  |  | 42.00% | 42.00% |  |
Percentage Of Coal Production Generated By Hourly Employees Represented By Organized Labor Unions |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |
Number of US Mines Represented by Unions |  |  |  | 2 |  |  |  |  |  |  |  | 2 | 2 |  |
Successor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  |  |  |  |  |  |  |  | $ 58.0 |  |  |
Provision for North Goonyella equipment loss |  |  |  | $ 17.1 | $ 49.3 |  |  |  |  | $ 0.0 |  | 66.4 |  |  |
Insurance Claim Limit |  |  |  |  |  |  |  |  |  |  |  | 125.0 |  |  |
Deductible Amount |  |  |  |  |  |  |  |  |  |  |  | 50.0 |  |  |
Restructuring charges | $ 3.0 |  |  |  |  |  |  |  |  | 7.6 |  | 1.2 |  |  |
Coal Reserves, in tons | T | 345.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Successor | Leased Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  |  |  |  |  | 50.4 |  |  |
Successor | Owned Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  |  |  |  |  | 16.0 |  |  |
Successor | Stanmore Coal Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [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 | DTA and PBGC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Successor | Red Mountain Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |  | $ 37.0 |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  |  | $ 20.6 |  |  |
Successor | United Mine Workers of America | Kayenta Mine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of hourly employees represented by organized labor unions |  |  |  | 7.00% |  |  |  |  |  |  |  | 7.00% | 7.00% |  |
Percentage Of Coal Production Generated By Hourly Employees |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% |  |
Successor | United Mine Workers of America | Shoal Creek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of hourly employees represented by organized labor unions |  |  |  | 9.00% |  |  |  |  |  |  |  | 9.00% | 9.00% |  |
Successor | Wambo Operation Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 23.00% |  |  |  |  |  |  |  | 23.00% | 23.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  |  |  | 18.00% | 18.00% |  |
Successor | North Goonyella UG Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 8.00% |  |  |  |  |  |  |  | 8.00% | 8.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Successor | Metropolitan Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 12.00% |  |  |  |  |  |  |  | 12.00% | 12.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Successor | Moorvale Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 14.00% |  |  |  |  |  |  |  | 14.00% | 14.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |
Successor | Millenium Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 1.00% |  |  |  |  |  |  |  | 1.00% | 1.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Successor | Coppabella/Moorvale Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 20.00% |  |  |  |  |  |  |  | 20.00% | 20.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  |  |  | 9.00% | 9.00% |  |
Successor | Wilpinjong Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Australian Hourly Employees Under Contract Negotiations |  |  |  | 23.00% |  |  |  |  |  |  |  | 23.00% | 23.00% |  |
Percentage Of Coal Production Generated By Australian Hourly Employees Under Contract Negotiation |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  | $ 0.0 |  |  |  |  |  | $ 0.0 |
Restructuring charges |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  | 15.5 |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  | 24.3 |  |  |  |  |  | 144.4 |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  | 22.8 |  |  |  |  |  | $ 23.2 |
Predecessor | DTA and PBGC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 20.5 |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  | 37.50% |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  | $ 19.7 |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  |  |  |  |  |  |  | $ 285.0 |  |  |  |
Scenario, Forecast | Leased Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  |  |  |  |  |  |  | $ 16.0 |  |  |  |

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