Intangible Contract Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Revenue Recognition [Abstract]

Schedule Of Intangible Assets And Liabilities

The balances, net of accumulated amortization, and respective balance sheet classifications at December 31, 2020 and 2019, are set forth in the following tables:

	December 31, 2020
	Assets		Liabilities		Net Total
	(Dollars in millions)
Coal supply agreements	$	7.9	$	(17.3)	$	(9.4)
Take-or-pay contracts	—		(34.7)		(34.7)
Total	$	7.9	$	(52.0)	$	(44.1)
Balance sheet classification:
Investments and other assets	$	7.9	$	—	$	7.9
Accounts payable and accrued expenses	—		(4.4)		(4.4)
Other noncurrent liabilities	—		(47.6)		(47.6)
Total	$	7.9	$	(52.0)	$	(44.1)

	December 31, 2019
	Assets		Liabilities		Net Total
	(Dollars in millions)
Coal supply agreements	$	20.7	$	(21.4)	$	(0.7)
Take-or-pay contracts	—		(40.0)		(40.0)
Total	$	20.7	$	(61.4)	$	(40.7)
Balance sheet classification:
Investments and other assets	$	20.7	$	—	$	20.7
Accounts payable and accrued expenses	—		(8.4)		(8.4)
Other noncurrent liabilities	—		(53.0)		(53.0)
Total	$	20.7	$	(61.4)	$	(40.7)