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Discontinued Operations - Patriot Related Matters (Details) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Oct. 09, 2015 buyer | Dec. 31, 2007 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of income taxes | $ (24,300,000) | $ 2,300,000 | $ (20,000,000.0) | $ 6,800,000 |  |  |
Accounts receivable, credit loss expense (reversal) | 100,000 | $ 0 | 100,000 | $ 0 |  |  |
Patriot |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buyers | buyer |  |  |  |  |  | 2 |
Spinoff | Patriot | Black Lung Occupational Disease Liability |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Initially determined potential exposure from patriot bankruptcy |  |  |  |  |  |  | $ 150,000,000
Potential exposure from patriot bankruptcy | $ 89,700,000 |  | $ 89,700,000 |  | $ 90,100,000 |  |

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