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v3.19.1

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 | Mar. 31, 2019 USD ($) | Mar. 31, 2018 AUD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 06, 2018
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  |  |  |  | $ 58.0 |
Insurance Recoveries |  |  | $ 125.0 |  | $ 0.0 |  |  |  |
Provision for North Goonyella equipment loss |  |  | 24.7 |  | 0.0 |  |  | $ 66.4 |
Containment and idling costs |  |  | 36.9 |  |  |  |  |  |
Deductible Amount |  |  | 50.0 |  |  |  |  |  |
Insurance Recoveries, Cash Collected |  |  | 8.1 |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 11.0 |  | 23.0 |  |  |  |
Net gain on disposals |  |  | $ 1.5 |  | 30.6 |  |  |  |
Interest in unincorporated joint venture project |  |  | 50.00% |  |  | 50.00% |  |  |
Stanmore Coal Limited |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Coal Reserves, in tons | T |  | 23.0 |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  | $ 22.0 | $ 7.0 |  |  |  |  |  |
Accounts Receivable, Net |  |  | 7.0 |  |  | $ 7.0 |  |  |
Other |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  | 17.2 |  |  |  |  |  |
Leased Equipment |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  |  | $ 50.7 |  |  |
Owned Equipment |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  | $ 23.2 |  |  |  |  |  |
DTA and PBGC |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  | 50.00%
Red Mountain Joint Venture |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  | 20.0 |  |  |  |
Net gain on disposals |  |  |  |  | 7.1 |  |  |  |
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 |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  |  |  | $ 275.0 |  |
Scenario, Forecast | Leased Equipment |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  |  |  |  | $ 10.0 |  |
Subsequent Event | Yancoal Technology Development Pty Ltd |  |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |  |
Payments to exercise option to acquire equipment | $ 54.2 |  |  |  |  |  |  |  |

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