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Derivatives and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative [Line Items]  
Credit and non-performance risk, level 3 [Text Block]
The following table summarizes the quantitative unobservable input utilized in the Company's internally-developed valuation models for foreign currency and commodity purchase/sale contracts classified as Level 3 as of December 31, 2015:
 
 
Range
 
Weighted
Input
 
Low
 
High
 
Average
Credit and non-performance risk
 
26
%
 
36
%
 
30
%
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, 2015
 
 
Commodity Contracts
 
Foreign Currency Contracts
 
Total
 
(Dollars in millions)
Beginning of period
 
$
—

 
$
—

 
$
—

Transfers into Level 3
 
76.0

 
259.8

 
335.8

Total net losses realized/unrealized:
 
 
 
 
 
 
Included in earnings
 
(0.2
)
 
—

 
(0.2
)
Included in other comprehensive income
 
112.8

 
103.0

 
215.8

Settlements
 
(64.9
)
 
(162.1
)
 
(227.0
)
End of period
 
$
123.7

 
$
200.7

 
$
324.4
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
The following table summarizes the changes in net unrealized losses relating to Level 3 financial liabilities held both as of the beginning and the end of the period:
 
 
Year Ended
 
 
December 31, 2015
 
 
Commodity Contracts
 
Foreign Currency Contracts
 
Total
 
(Dollars in millions)
Changes in net unrealized losses (1)
 
$
56.7

 
$
31.7

 
$
88.4

(1) 
Within the consolidated statements of operations and condensed consolidated statements of comprehensive income for the periods presented, unrealized losses from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods.
Non Coal Trading [Member]  
Derivative [Line Items]  
Company's foreign currency and commodity positions
Notional Amounts and Fair Value.  The following summarizes the Company’s foreign currency and commodity positions at December 31, 2015:
 
Notional Amount by Year of Maturity
 
Total
 
2016
 
2017
Foreign Currency
 

 
 

 
 

A$:US$ hedge contracts (A$ millions)
$
1,530.0

 
$
1,007.0

 
$
523.0

Commodity Contracts
 

 
 

 
 

Diesel fuel hedge contracts (million gallons)
148.8

 
89.5

 
59.3

 
Instrument Classification by
 
 
 
 
Cash
Flow
Hedge
 
Fair
Value
Hedge
 
Economic
Hedge
 
 
Fair Value
of Net Liability
 
 
 
 
 
 
 
 
(Dollars in millions)
Foreign Currency
 

 
 

 
 

 
 
 

A$:US$ hedge contracts (A$ millions)
$
1,530.0

 
$
—

 
$
—

 
 
$
(200.7
)
Commodity Contracts
 

 
 

 
 

 
 
 

Diesel fuel hedge contracts (million gallons)
148.8

 
—

 
—

 
 
(123.7
)
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 non-coal trading hedges during the years ended December 31, 2015, 2014 and 2013:
 
 
 
 
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)
 
Gain
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
)

(1) 
Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $136.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
 
 
 
 
Year Ended December 31, 2013
 
 
Income Statement Classification
Gains (Losses) - Realized
 
Gain (loss)
recognized in
other
comprehensive
income on
derivative
(effective portion)
 
Gain
reclassified
from other
comprehensive
income into
income
(effective
portion)
 
Loss
reclassified
from other
comprehensive
income into
income
(ineffective
portion)
Financial Instrument
 
 
 
 
 
 
 
 
(Dollars in millions)
Commodity swap contracts
 
Operating costs and expenses
 
$
12.5

 
$
11.9

 
$
(0.5
)
Foreign currency forward contracts
 
Operating costs and expenses
 
(597.8
)
 
162.4

 
—

Total
 
 
 
$
(585.3
)
 
$
174.3

 
$
(0.5
)
Classification and amount of non-coal trading derivatives, gross and net basis
The classification and amount of non-coal trading derivative financial instruments presented on a gross and net basis as of December 31, 2015 and 2014 are presented in the table that follows.

 
 
 
Fair Value of Liabilities Presented in the Consolidated Balance Sheet as of December 31, 2015 (1)
 
Fair Value of Liabilities Presented in the Consolidated Balance Sheet as of December 31, 2014 (1)
 
Financial Instrument
 
 
 
 
 
 
Current Liabilities:
 
 
 
 
 
 
Commodity swap contracts
 
 
$
86.1

 
$
100.1

 
Foreign currency forward contracts
 
 
145.6

 
241.0

 
Total
 
 
$
231.7

 
$
341.1

 
 
 
 
 
 
 
 
Noncurrent Liabilities:
 
 
 
 
 
 
Commodity swap contracts
 
 
$
37.6

 
$
67.0

 
Foreign currency forward contracts
 
 
55.1

 
169.0

 
Total
 
 
$
92.7

 
$
236.0

 
(1) 
All commodity swap contracts and foreign currency forward contracts were in a liability position as of December 31, 2015 and 2014.
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
)
 
December 31, 2014
 
Level 1 
 
Level 2
 
Level 3
 
Total
 
 
 
(Dollars in millions)
 
 
Investments in debt and equity securities
$
26.1

 
$
35.7

 
$
—

 
$
61.8

Commodity swap contracts
—

 
(167.1
)
 
—

 
(167.1
)
Foreign currency forward contracts
—

 
(410.0
)
 
—

 
(410.0
)
Total net financial assets (liabilities)
$
26.1

 
$
(541.4
)
 
$
—

 
$
(515.3
)
Carrying amounts and estimated fair values of the Company's debt
The carrying amounts and estimated fair values of the Company’s long-term debt are summarized as follows:
 
December 31, 2015
 
December 31, 2014
 
Carrying
Amount
 
Estimated
Fair Value
 
Carrying
Amount
 
Estimated
Fair Value
 
 
 
(Dollars in millions)
 
 
Long-term debt
$
6,315.6

 
$
1,372.7

 
$
5,986.8

 
$
5,227.9