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Intangible Contract Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue Recognition [Abstract]  
Schedule Of Intangible Assets And Liabilities The balances, net of accumulated amortization, and respective balance sheet classifications at September 30, 2019 and December 31, 2018, are set forth in the following tables:
 
September 30, 2019
 
Assets
 
Liabilities
 
Net Total
 
(Dollars in millions)
Coal supply agreements
$
44.5

 
$
(23.4
)
 
$
21.1

Take-or-pay contracts
—

 
(41.2
)
 
(41.2
)
Total
$
44.5

 
$
(64.6
)
 
$
(20.1
)
 
 
 
 
 
 
Balance sheet classification:
 
 
 
 
 
Investments and other assets
$
44.5

 
$
—

 
$
44.5

Accounts payable and accrued expenses
—

 
(9.5
)
 
(9.5
)
Other noncurrent liabilities
—

 
(55.1
)
 
(55.1
)
Total
$
44.5

 
$
(64.6
)
 
$
(20.1
)
 
 
 
 
 
 
 
December 31, 2018
 
Assets
 
Liabilities
 
Net Total
 
(Dollars in millions)
Coal supply agreements
$
70.9

 
$
(32.9
)
 
$
38.0

Take-or-pay contracts
—

 
(57.1
)
 
(57.1
)
Total
$
70.9

 
$
(90.0
)
 
$
(19.1
)
 
 
 
 
 
 
Balance sheet classification:
 
 
 
 
 
Investments and other assets
$
70.9

 
$
—

 
$
70.9

Accounts payable and accrued expenses
—

 
(20.3
)
 
(20.3
)
Other noncurrent liabilities
—

 
(69.7
)
 
(69.7
)
Total
$
70.9

 
$
(90.0
)
 
$
(19.1
)