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Commitments and Contingencies (Details) $ in Millions | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 09, 2015 buyer | Dec. 31, 2007 USD ($)
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Patriot |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Number of buyers | buyer |  |  | 2 |
Black Lung Occupational Disease Liability | Patriot | Spinoff |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Initially determined potential exposure from patriot bankruptcy |  |  |  | $ 150.0
Black Lung Occupational Disease Liability | Patriot | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Initially determined potential exposure from patriot bankruptcy | $ 80.0 | $ 82.3 |  |
Capital Addition Purchase Commitments |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Unrecorded unconditional purchase obligation (within next five years) | 100.8 |  |  |
Unrecorded unconditional purchase obligation (within next 12 months) | $ 94.1 |  |  |

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