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Commitments And Contingent Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
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,
| 2020 |  | 2019
Discount rate(1) | 2.0 | % |  | 2.9 | %
Active claims | 309 |  |  | 324 |
Total black lung liability (dollars in millions)(2) | $ | 64.6 |  |  | $ | 55.1 |
(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 $1.6 million in 2020. (2)The current portion of the black lung liability was $4.6 million at both December 31, 2020 and 2019, respectively, and was included in accrued liabilities on the Consolidated Balance Sheets. The following table summarizes annual black lung payments and expense:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| (Dollars in millions)
Payments | $ | 6.0 |  |  | $ | 5.2 |  |  | $ | 6.3 |
Expense (1) | $ | 15.4 |  |  | $ | 10.9 |  |  | $ | 5.4 |
(1)Expenses incurred in excess of annual accretion of the black lung liability primarily reflect the impact of changes in discount rates as well as increases in expected future claims as a result of higher refiling and approval rate assumptions.

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