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Other Events (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Jun. 18, 2019
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Restructuring Charges | $ 16,500,000 | $ 400,000 |  | $ 23,000,000.0 | $ 600,000 |  |  |
Provision for North Goonyella equipment loss | 0 | 0 |  | 0 | 24,700,000 | $ 66,400,000 |  |
Insurance recovery related to North Goonyella equipment losses | $ 0 | 0 |  | $ 0 | (125,000,000.0) |  |  |
Interest in unincorporated joint venture project | 50.00% |  |  | 50.00% |  |  |  |
North Goonyella Mine |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  | 24,700,000 |  | $ 149,600,000 |
Containment and idling costs | $ 11,300,000 | $ 28,400,000 |  | $ 21,400,000 | 65,300,000 |  |  |
Insurance recovery related to North Goonyella equipment losses |  |  | $ 125,000,000 |  | $ 125,000,000.0 |  |  |
Deductible Amount |  |  | $ 50,000,000 |  |  |  |  |
North Goonyella Mine | Mine Carrying Value |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Costs Related to North Goonyella Events |  |  |  | $ 300,000,000 |  |  |  |
PRB Colorado Joint Venture [Member] |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Joint Venture Ownership Percentage by Parent |  |  |  |  |  |  |  | 66.50%
Joint Venture Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  | 33.50%

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