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Intangible Contract Assets and Liabilities (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue Recognition [Abstract]  
Schedule Of Intangible Assets And Liabilities
The balances, net of accumulated amortization, and respective balance sheet classifications at March 31, 2019 and December 31, 2018, are set forth in the following tables:
 
March 31, 2019
 
(Dollars in millions)
 
Assets
 
Liabilities
 
Net Total
Coal supply agreements
$
60.5

 
$
(27.3
)
 
$
33.2

Take-or-pay contracts
—

 
(51.8
)
 
(51.8
)
Total
$
60.5

 
$
(79.1
)
 
$
(18.6
)
 
 
 
 
 
 
Balance sheet classification:
 
 
 
 
 
Investments and other assets
$
60.5

 
$
—

 
$
60.5

Accounts payable and accrued expenses
—

 
(14.0
)
 
(14.0
)
Other noncurrent liabilities
—

 
(65.1
)
 
(65.1
)
Total
$
60.5

 
$
(79.1
)
 
$
(18.6
)
 
 
 
 
 
 
 
December 31, 2018
 
(Dollars in millions)
 
Assets
 
Liabilities
 
Net Total
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
)