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Intangible Contract Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Intangible Contract Assets and Liabilities Disclosure [Abstract]  
Schedule Of Intangible Assets And Liabilities [Table Text Block]
The balances, net of accumulated amortization, and respective balance sheet classifications at December 31, 2018 and 2017, are set forth in the following tables:
 
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
)

 
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