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Intangible Contract Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue Recognition [Abstract]  
Schedule Of Intangible Assets And Liabilities
The balances and respective balance sheet classifications of such assets and liabilities at June 30, 2018 and December 31, 2017, net of accumulated amortization, are set forth in the following tables:
 
June 30, 2018
 
(Dollars in millions)
 
Assets
 
Liabilities
 
Net Total
Coal supply agreements
$
115.5

 
$
(35.4
)
 
$
80.1

Take-or-pay contracts
—

 
(70.5
)
 
(70.5
)
Total
$
115.5

 
$
(105.9
)
 
$
9.6

 
 
 
 
 
 
Balance sheet classification:
 
 
 
 
 
Investments and other assets
$
115.5

 
$
—

 
$
115.5

Accounts payable and accrued expenses
—

 
(22.4
)
 
(22.4
)
Other noncurrent liabilities
—

 
(83.5
)
 
(83.5
)
Total
$
115.5

 
$
(105.9
)
 
$
9.6

 
 
 
 
 
 
 
December 31, 2017
 
(Dollars in millions)
 
Assets
 
Liabilities
 
Net Total
Coal supply agreements
$
177.2

 
$
(42.7
)
 
$
134.5

Take-or-pay contracts
—

 
(90.7
)
 
(90.7
)
Total
$
177.2

 
$
(133.4
)
 
$
43.8

 
 
 
 
 
 
Balance sheet classification:
 
 
 
 
 
Investments and other assets
$
177.2

 
$
—

 
$
177.2

Accounts payable and accrued expenses
—

 
(27.6
)
 
(27.6
)
Other noncurrent liabilities
—

 
(105.8
)
 
(105.8
)
Total
$
177.2

 
$
(133.4
)
 
$
43.8