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Derivatives and Fair Value Measurements (Tables) - Non Coal Trading [Member]
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]    
Classification and amounts of pre-tax gains and losses related to the Company's non coal-trading hedges
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017
Financial Instrument
 
Income Statement
Classification of (Losses) Gains
 
Total realized loss recognized in income
 
Loss reclassified from other comprehensive loss into income
 
(Loss) gain recognized in income on derivatives
 
Unrealized gain (loss)recognized in income on non- designated derivatives
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
(11.0
)
 
$
(11.0
)
 
$
—

 
$
—

Foreign currency forward contracts
 
Operating costs and expenses
 
(16.6
)
 
(16.6
)
 
—

 
—

Total
 
 
 
$
(27.6
)
 
$
(27.6
)
 
$
—

 
$
—
The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives during the three months ended March 31, 2017 and March 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017
Financial Instrument
 
Income Statement
Classification of (Losses) Gains
 
Total realized loss recognized in income
 
Loss reclassified from other comprehensive loss into income
 
(Loss) gain recognized in income on derivatives
 
Unrealized gain (loss)recognized in income on non- designated derivatives
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
(11.0
)
 
$
(11.0
)
 
$
—

 
$
—

Foreign currency forward contracts
 
Operating costs and expenses
 
(16.6
)
 
(16.6
)
 
—

 
—

Total
 
 
 
$
(27.6
)
 
$
(27.6
)
 
$
—

 
$
—


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2016
Financial Instrument
 
Income Statement
Classification of (Losses) Gains
 
Total realized loss recognized in income
 
Loss reclassified from other comprehensive loss into income
 
(Loss) gain recognized in income on derivatives
 
Unrealized gain (loss)recognized in income on non- designated derivatives
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
(34.9
)
 
$
(24.8
)
 
$
(10.1
)
 
$
(5.4
)
Foreign currency forward contracts
 
Operating costs and expenses
 
(76.1
)
 
(53.9
)
 
(22.2
)
 
30.4

Total
 
 
 
$
(111.0
)
 
$
(78.7
)
 
$
(32.3
)
 
$
25.0
Carrying amounts and estimated fair values of the Company's debt
The estimated fair value of the Company’s current and long-term debt as of December 31, 2016 and March 31, 2017 is unable to be determined given it is subject to compromise in connection with the Plan.