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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 | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) T | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) employees | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) employees | Sep. 30, 2018 AUD ($) employees | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 18, 2019 | Feb. 06, 2018
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  | 66.50% |
Joint Venture Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  |  | 33.50% |
Provision for North Goonyella equipment loss |  |  | $ 0.0 | $ 49.3 |  | $ 24.7 | $ 49.3 |  |  | $ 66.4 |  |
Carrying value of longwall |  |  | 4,899.2 |  |  | 4,899.2 |  |  | $ 4,899.2 | 5,207.0 |  |
Insurance recovery related to North Goonyella equipment losses |  |  | 0.0 | 0.0 |  | 125.0 | 0.0 |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  | 27.6 | 69.0 |  |  |  |  |
Net gain on disposals |  |  | $ 1.1 | 20.8 |  | $ 2.8 | 49.8 |  |  |  |  |
Interest in unincorporated joint venture project |  |  | 50.00% |  |  | 50.00% |  |  | 50.00% |  |  |
Asset impairment charges |  |  | $ 20.0 | 0.0 |  | $ 20.0 | 0.0 |  |  |  |  |
At-risk carrying value |  |  | 358.0 |  |  | 358.0 |  |  | $ 358.0 |  |  |
DTA and PBGC |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Red Mountain Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  | 20.0 |  |  |  |  |
Net gain on disposals |  |  |  |  |  |  | 7.1 |  |  |  |  |
Stanmore Coal Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposals |  |  |  | $ 20.5 |  |  | 20.5 |  |  |  |  |
Queensland’s Bowen Basin |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  | $ 37.0 |  |  |  |
Net gain on disposals |  |  |  |  |  |  | $ 20.6 |  |  |  |  |
Stanmore Coal Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coal Reserves, in tons | T |  | 23.0 |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  | $ 22.0 |  |  |  |  |  |  |  |  |  |
Other US Mining Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 0.0 |  |  |  |  |  |
North Goonyella Mine |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of employees harmed | employees |  |  |  | 0 |  |  | 0 | 0 |  |  |  |
Provision for North Goonyella equipment loss |  |  | 60.0 | $ 49.3 |  | 24.7 |  |  |  | 66.4 |  |
Containment and idling costs |  |  | 29.3 | 9.0 |  | 94.6 | $ 9.0 |  |  | $ 58.0 |  |
Insurance recovery related to North Goonyella equipment losses |  |  |  |  |  | 125.0 |  |  |  |  |  |
Deductible Amount |  |  |  |  |  | 50.0 |  |  |  |  |  |
North Goonyella Mine | Yancoal Technology Development Pty Ltd |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to exercise option to acquire equipment | $ 54.2 |  |  |  |  |  |  |  |  |  |  |
North Goonyella Mine | Other |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  |  | 17.2 |  |  |
North Goonyella Mine | Leased Equipment |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  |  | 50.7 |  |  |
North Goonyella Mine | Owned Equipment |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  |  |  |  | $ 23.2 |  |  |
Wildcat Hills Underground [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | $ 20.0 | $ 0.0 |  | $ 20.0 | $ 0.0 |  |  |  |  |
Scenario, Forecast | North Goonyella Mine | Mine Carrying Value |  |  |  |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  | $ 272.0 |  |  |  |  |  |  |

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