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Commitments and Contingent Liabilities - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |
Threshold for disclosing material environmental legal proceedings | $ 1.0 |
Uninsured Risk |  |
Loss Contingencies [Line Items] |  |
Payments | 40.4 | $ 8.4
Black lung Benefit |  |
Loss Contingencies [Line Items] |  |
Payments | 4.1 |
Accretion | 6.0 |
Accrual for black lung liability | $ 60.0 |

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