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Commitments and Contingent Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract] |
Schedule of black lung benefit liabilities | The following table summarizes discount rates utilized, active claims and the total black lung liabilities:
| December 31,
| 2022 |  | 2021
Discount rate(1) | 4.9 | % |  | 2.4 | %
Active claims | 332 |  |  | 332 |
Total black lung liability (dollars in millions)(2) | $ | 58.1 |  |  | $ | 63.3 |
(1)The discount rate is determined based on a portfolio of high-quality corporate bonds with maturities that are consistent with the estimated duration of our black lung obligations. A decrease of 25 basis points in the discount rate would have increased black lung expense by $1.1 million in 2022. (2)The current portion of the black lung liability was $5.9 million and $5.4 million at December 31, 2022 and 2021, respectively, and was included in accrued liabilities on the Consolidated Balance Sheets. The following table summarizes annual black lung payments and (benefit) expense:
| Years Ended December 31,
| 2022 |  | 2021 |  | 2020
| (Dollars in millions)
Payments | $ | 5.0 |  |  | $ | 4.4 |  |  | $ | 6.0 |
(Benefit) expense (1) | $ | (0.2) |  |  | $ | 3.1 |  |  | $ | 15.4 |
(1)Black lung (benefit) expense incurred in excess of annual accretion of the black lung liability reflects the impact of changes in discount rates, current filing and approval rate assumptions and/or other changes in our actuarial assumptions.

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