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Commitments And Contingent Liabilities (Tables)

12 Months Ended

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.