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Derivatives and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Derivative [Line Items]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table summarizes the changes related to the Company’s Corporate Hedging derivative financial instruments recurring Level 3 financial liabilities:
 
 
Year Ended
 
 
December 31, 2016
 
 
Commodity Contracts
 
Foreign Currency Contracts
 
Total
 
(Dollars in millions)
Beginning of period
 
$
123.7

 
$
200.7

 
$
324.4

Total net losses realized/unrealized:
 
 
 
 
 
 
Included in earnings
 
15.7

 
(48.0
)
 
(32.3
)
Settlements / terminations
 
(139.4
)
 
(152.7
)
 
(292.1
)
End of period
 
$
—

 
$
—

 
$
—
Non Coal Trading [Member]  
Derivative [Line Items]  
Classification and amounts of pre-tax gains and losses related to the Company's non-trading hedges
The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives during the years ended December 31, 2016, 2015 and 2014:
 
 
 
 
Year Ended December 31, 2016
 
 
Income Statement Classification
Losses - Realized
 
Total realized loss recognized in income
 
Loss
reclassified
from other
comprehensive
income into
income (1)
 
(Loss) gain recognized in income on derivatives
Financial Instrument
 
 
 
 
 
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
(98.0
)
 
$
(86.1
)
 
$
(11.9
)
Commodity swap contracts
 
Reorganization items, net
 
(38.8
)
 
—

 
(38.8
)
Foreign currency forward contracts
 
Operating costs and expenses
 
(142.9
)
 
(145.6
)
 
2.7

Foreign currency forward contracts
 
Reorganization items, net
 
(36.4
)
 
—

 
(36.4
)
Total
 
 
 
$
(316.1
)
 
$
(231.7
)
 
$
(84.4
)
(1) 
Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $13.6 million and $9.0 million of previously unrecognized losses on foreign currency and fuel contracts, respectivley, monetized in first quarter of 2016.
 
 
 
 
Year Ended December 31, 2015
 
 
Income Statement Classification
Losses - Realized
 
Loss
recognized in
other
comprehensive
income on
derivative
(effective portion)
 
Loss
reclassified
from other
comprehensive
income into
income
(effective
portion)(1)
 
Loss
reclassified
from other
comprehensive
income into
income
(ineffective
portion)
Financial Instrument
 
 
 
 
 
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
(77.0
)
 
$
(122.0
)
 
$
1.6

Foreign currency forward contracts
 
Operating costs and expenses
 
(122.0
)
 
(316.4
)
 
—

Total
 
 
 
$
(199.0
)
 
$
(438.4
)
 
$
1.6


(1) 
Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
 
 
 
 
Year Ended December 31, 2014
 
 
Income Statement Classification
Losses - Realized
 
Loss
recognized in
other
comprehensive
income on
derivative
(effective portion)
 
Loss
reclassified
from other
comprehensive
income into
income
(effective
portion)(1)
 
Loss
reclassified
from other
comprehensive
income into
income
(ineffective
portion)
Financial Instrument
 
 
 
 
 
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
(194.5
)
 
$
(20.6
)
 
$
(1.7
)
Foreign currency forward contracts
 
Operating costs and expenses
 
(100.9
)
 
(27.3
)
 
—

Total
 
 
 
$
(295.4
)
 
$
(47.9
)
 
$
(1.7
)
Classification and amount of non-coal trading derivatives, gross and net basis
 
Fair Value of Liabilities Presented in the Consolidated Balance Sheet as of December 31, 2015 (1)
Financial Instrument
 
(Dollars in millions)
Current Liabilities:
 
Commodity swap contracts
$
86.1

Foreign currency forward contracts
145.6

Total
$
231.7

 
 
Noncurrent Liabilities:
 
Commodity swap contracts
$
37.6

Foreign currency forward contracts
55.1

Total
$
92.7

(1) 
All commodity swap contracts and foreign currency forward contracts were in a liability position as of December 31, 2015.
Fair value measured on recurring basis of net financial assets and liabilities
Financial Instruments Measured on a Recurring Basis. The following tables set forth the hierarchy of the Company’s net financial (liability) asset positions for which fair value is measured on a recurring basis:
 
December 31, 2015
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
 
(Dollars in millions)
 
 
Investments in debt and equity securities
$
—

 
$
—

 
$
—

 
$
—

Commodity swap contracts
—

 
—

 
(123.7
)
 
(123.7
)
Foreign currency forward contracts
—

 
—

 
(200.7
)
 
(200.7
)
Total net financial liabilities
$
—

 
$
—

 
$
(324.4
)
 
$
(324.4
)
Carrying amounts and estimated fair values of the Company's debt
 
December 31, 2015
 
Carrying
Amount
 
Estimated
Fair Value
 
(Dollars in millions)
Current and Long-term debt
$
6,241.2

 
$
1,373.7