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Intangible Contract Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue Recognition [Abstract]  
Schedule Of Intangible Assets And Liabilities The balances, net of accumulated amortization, and respective balance sheet classifications at June 30, 2019 and December 31, 2018, are set forth in the following tables:
 
June 30, 2019
 
Assets
 
Liabilities
 
Net Total
 
(Dollars in millions)
Coal supply agreements
$
51.9

 
$
(25.5
)
 
$
26.4

Take-or-pay contracts
—

 
(45.6
)
 
(45.6
)
Total
$
51.9

 
$
(71.1
)
 
$
(19.2
)
 
 
 
 
 
 
Balance sheet classification:
 
 
 
 
 
Investments and other assets
$
51.9

 
$
—

 
$
51.9

Accounts payable and accrued expenses
—

 
(11.2
)
 
(11.2
)
Other noncurrent liabilities
—

 
(59.9
)
 
(59.9
)
Total
$
51.9

 
$
(71.1
)
 
$
(19.2
)
 
 
 
 
 
 
 
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
)