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Commitments and Contingent Liabilities - Schedule of Black Lung Benefit Liabilities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) claim | Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items] |  |
Current portion of black lung liability | $ 5.9 | $ 5.9
Black lung Benefit |  |
Loss Contingencies [Line Items] |  |
Discount rate | 4.90% |
Active claims | claim | 332 |
Total black lung liability discounted (dollars in millions) | $ 58.1 |
Total black lung liability, undiscounted (dollars in millions) | 88.4 |
Increase in black lung expense | 1.1 |
Current portion of black lung liability | $ 5.9 | $ 5.9

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