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Coal Trading (Tables) - Coal Trading [Member]
 6 Months Ended
Jun. 30, 2016
Coal Trading [Line Items]  
Trading revenues by type of instrument
Trading (losses) revenues recognized during the three and six months ended June 30, 2016 and 2015 were as follows:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
Trading Revenues by Type of Instrument
 
2016
 
2015
 
2016
 
2015
 
 
(Dollars in millions)
Futures, swaps and options
 
$
(32.3
)
 
$
3.0

 
$
(36.3
)
 
$
41.6

Physical purchase/sale contracts
 
27.7

 
(1.5
)
 
22.9

 
(23.4
)
Total trading (losses) revenues
 
$
(4.6
)
 
$
1.5

 
$
(13.4
)
 
$
18.2
Fair value of assets and liabilities from coal trading activities and related balance sheet offsetting disclosures
The fair value of assets and liabilities from coal trading activities presented on a gross and net basis as of June 30, 2016 and December 31, 2015 is set forth below:
Affected line item in the condensed consolidated balance sheets
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Condensed Consolidated Balance Sheets
 
Variation margin (held) posted (1)
 
Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets
 
 
(Dollars in millions)
 
 
Fair Value as of June 30, 2016
Assets from coal trading activities, net
 
$
112.4

 
$
(92.2
)
 
$
(2.9
)
 
$
17.3

Liabilities from coal trading activities, net
 
(143.6
)
 
92.2

 
35.7

 
(15.7
)
Total, net
 
$
(31.2
)
 
$
—

 
$
32.8

 
$
1.6

 
 
 
 
 
 
 
 
 
 
 
Fair Value as of December 31, 2015
Assets from coal trading activities, net
 
$
128.6

 
$
(87.3
)
 
$
(17.8
)
 
$
23.5

Liabilities from coal trading activities, net
 
(110.0
)
 
87.3

 
7.1

 
(15.6
)
Total, net
 
$
18.6

 
$
—

 
$
(10.7
)
 
$
7.9

(1) 
None of the net variation margin held at June 30, 2016 and December 31, 2015, respectively, related to cash flow hedges.
Fair value coal trading net assets (liabilities) measured on recurring basis
The following tables set forth the hierarchy of the Company’s net financial asset (liability) coal trading positions for which fair value is measured on a recurring basis as of June 30, 2016 and December 31, 2015:
 
June 30, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
—

 
$
0.6

 
$
—

 
$
0.6

Physical purchase/sale contracts
—

 
2.1

 
(1.1
)
 
1.0

Total net financial assets (liabilities)
$
—

 
$
2.7

 
$
(1.1
)
 
$
1.6

 
December 31, 2015
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
—

 
$
3.3

 
$
—

 
$
3.3

Physical purchase/sale contracts
—

 
20.2

 
(15.6
)
 
4.6

Total net financial assets (liabilities)
$
—

 
$
23.5

 
$
(15.6
)
 
$
7.9
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
The following table summarizes the quantitative unobservable inputs utilized in the Company's internally-developed valuation models for physical commodity purchase/sale contracts classified as Level 3 as of June 30, 2016:
 
 
Range
 
Weighted
Input
 
Low
 
High
 
Average
Quality adjustments
 
—
%
 
3
%
 
2
%
Location differentials
 
11
%
 
11
%
 
11
%
Credit and non-performance risk
 
27
%
 
27
%
 
27
%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table summarizes the changes in the Company’s recurring Level 3 net financial assets:
 
Three months ended June 30,
 
Six months ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Beginning of period
$
(3.9
)
 
$
2.2

 
$
(15.6
)
 
$
2.1

Transfers into Level 3
0.4

 
—

 
0.4

 
—

Transfers out of Level 3
—

 
—

 
10.7

 
—

Total (losses) gains realized/unrealized:
 

 
 

 
 

 
 

Included in earnings
(1.3
)
 
—

 
(1.4
)
 
0.5

Sales
—

 
—

 
(0.1
)
 
—

Settlements
3.7

 
(0.4
)
 
4.9

 
(0.8
)
End of period
$
(1.1
)
 
$
1.8

 
$
(1.1
)
 
$
1.8
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]
The following table summarizes the changes in net unrealized (losses) gains relating to Level 3 net financial assets held both as of the beginning and the end of the period:
 
Three months ended June 30,
 
Six months ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Changes in unrealized (losses) gains (1)
$
(0.1
)
 
$
0.1

 
$
(0.2
)
 
$
0.3

(1) 
Within the unaudited condensed consolidated statements of operations and unaudited condensed consolidated statements of comprehensive income for the periods presented, unrealized gains and 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.
Schedule Of Future Realization Of Trading Portfolio [Table Text Block]
As of June 30, 2016, the timing of the estimated future realization of the value of the Company’s trading portfolio, on a cumulative cash basis, was as follows:
 
 
Percentage of
Year of Expiration
 
Portfolio Total
 
 
 
2016
 
19
 %
2017
 
83
 %
2018
 
(2
)%
 
 
100
 %