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Coal Trading (Tables) - Coal Trading [Member]
 9 Months Ended
Sep. 30, 2015
Coal Trading [Line Items]  
Trading revenues by type of instrument
Trading revenues recognized during the three and nine months ended September 30, 2015 and 2014 were as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
Trading Revenues by Type of Instrument
 
2015
 
2014
 
2015
 
2014
 
 
(Dollars in millions)
Commodity futures, swaps and options
 
$
47.7

 
$
10.7

 
$
89.4

 
$
69.0

Physical commodity purchase/sale contracts
 
(23.2
)
 
4.3

 
(46.7
)
 
(22.7
)
Total trading revenues
 
$
24.5

 
$
15.0

 
$
42.7

 
$
46.3
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 September 30, 2015 and December 31, 2014 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 September 30, 2015
Assets from coal trading activities, net
 
$
203.4

 
$
(123.4
)
 
$
(37.7
)
 
$
42.3

Liabilities from coal trading activities, net
 
(156.8
)
 
123.4

 
5.3

 
(28.1
)
Total, net
 
$
46.6

 
$
—

 
$
(32.4
)
 
$
14.2

 
 
 
 
 
 
 
 
 
 
 
Fair Value as of December 31, 2014
Assets from coal trading activities, net
 
$
342.5

 
$
(248.3
)
 
$
(36.6
)
 
$
57.6

Liabilities from coal trading activities, net
 
(285.0
)
 
248.3

 
4.0

 
(32.7
)
Total, net
 
$
57.5

 
$
—

 
$
(32.6
)
 
$
24.9

(1) 
A total of $0.7 million of the net variation margin held at September 30, 2015 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 September 30, 2015 and December 31, 2014:
 
September 30, 2015
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Commodity futures, swaps and options
$
(7.0
)
 
$
19.0

 
$
—

 
$
12.0

Physical commodity purchase/sale contracts
—

 
0.9

 
1.3

 
2.2

Total net financial (liabilities) assets
$
(7.0
)
 
$
19.9

 
$
1.3

 
$
14.2

 
December 31, 2014
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Commodity futures, swaps and options
$
(0.2
)
 
$
32.6

 
$
—

 
$
32.4

Physical commodity purchase/sale contracts
—

 
(9.6
)
 
2.1

 
(7.5
)
Total net financial (liabilities) assets
$
(0.2
)
 
$
23.0

 
$
2.1

 
$
24.9