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Commitments and Contingent Liabilities (Black Lung Benefit Liabilities) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 21, 2020 USD ($) | Dec. 31, 2022 USD ($) claim | Dec. 31, 2021 USD ($) claim | Dec. 31, 2020 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrual for black lung |  | $ 5.9 | $ 5.4 |  |
Black Lung Benefit |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Discount rate |  | 4.90% | 2.40% |  |
Active claims | claim |  | 332 | 332 |  |
Total black lung liability (dollars in millions) |  | $ 58.1 | $ 63.3 |  |
Increase in black lung expense |  | 1.1 |  |  |
Payments |  | 5.0 | 4.4 | $ 6.0 |
(Benefit) expense |  | (0.2) | $ 3.1 | $ 15.4 |
Uninsured Risk |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Payments | $ 40.4 | $ 8.4 |  |  | $ 8.4

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