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Other Events (Details) T in Millions, $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) T | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Apr. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 AUD ($) | Sep. 20, 2018 USD ($) | Feb. 06, 2018 | Mar. 31, 2017 | Nov. 30, 2016 USD ($) | Nov. 30, 2015 USD ($)
Successor |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  | $ 9.0 |  |  |  |  |  |  |  |  |  |
Insurance Claim Limit |  |  | 125.0 |  |  |  |  |  |  |  |  |  |
Deductible Amount |  |  | 50.0 |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  | 49.3 | $ 0.0 |  | $ 0.0 | $ 49.3 |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  |  | 5.2 | 69.0 |  |  |  |  |  |
Net gain on disposal of assets |  |  | 20.8 | 0.4 |  | 0.9 | 49.8 |  |  |  |  |  |
Asset Impairment Charges |  |  | $ 0.0 | 0.0 |  | 0.0 | $ 0.0 |  |  |  |  |  |
Interest in unincorporated joint venture project |  |  | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |  |
Successor | Contract Termination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  | $ 0.0 | $ 0.0 |  | 0.0 | $ 0.0 |  |  |  |  |  |
Successor | Red Mountain Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  |  |  | 20.0 |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  |  |  | 7.1 |  |  |  |  |  |
Successor | Queensland’s Bowen Basin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  |  |  |  | $ 37.0 |  |  |  |  |
Net gain on disposal of assets |  |  |  |  |  |  | 20.6 |  |  |  |  |  |
Successor | DTA and PBGC |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Successor | Drummond Company, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Price of Acquired Entity |  |  |  |  |  |  |  |  | $ 400.0 |  |  |  |
Successor | Stanmore Coal Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Coal Reserves, in tons | T | 23.0 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable | $ 22.0 |  | 7.0 |  |  |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  | 20.5 |  |  |  | $ 20.5 |  |  |  |  |  |
Successor | Bowie Resource Partners, LLC [Member] | New Mexico And Colorado Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Contract Termination |  |  |  |  |  | $ 20.0 |  |  |  |  |  |  |
Successor | Leased Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  | 40.2 |  |  |  |  |  |  |  |  |  |
Successor | Owned Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  | $ 9.1 |  |  |  |  |  |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  | $ 0.0 |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  | 24.3 |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  | 22.8 |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 30.5 |  |  |  |  |  |  |  |
Predecessor | Contract Termination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 30.5 |  |  |  |  |  |  |  |
Predecessor | DTA and PBGC |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  | 37.50% |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  | 20.5 |  |  |  |  |  |  |  |
Net gain on disposal of assets |  |  |  |  | $ 19.7 |  |  |  |  |  |  |  |
Predecessor | Metropolitan Collieries Pty Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned Divestiture, Agreed Upon Proceeds from Divestiture |  |  |  |  |  |  |  |  |  |  |  | $ 200.0 |
Predecessor | Bowie Resource Partners, LLC [Member] | New Mexico And Colorado Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned Divestiture, Agreed Upon Proceeds from Divestiture |  |  |  |  |  |  |  |  |  |  |  |  | $ 358.0
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  | $ 284.0 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Leased Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  | $ 61.0 |  |  |  |  |  |  |  |  |  |  |

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