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Coal Trading (Tables) - Coal Trading [Member]
 3 Months Ended
Mar. 31, 2017
Coal Trading [Line Items]  
Trading revenues by type of instrument
Trading revenues (losses) recognized during the three months ended March 31, 2017 and 2016 were as follows:
 
 
Three Months Ended
 
 
March 31,
Trading Revenues by Type of Instrument
 
2017
 
2016
 
 
(Dollars in millions)
Futures, swaps and options
 
$
7.1

 
$
(4.0
)
Physical purchase/sale contracts
 
24.5

 
(4.8
)
Total trading revenues (losses)
 
$
31.6

 
$
(8.8
)
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 March 31, 2017 and December 31, 2016 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 March 31, 2017
Assets from coal trading activities, net
 
$
157.5

 
$
(155.2
)
 
$
(1.7
)
 
$
0.6

Liabilities from coal trading activities, net
 
(185.3
)
 
155.2

 
29.4

 
(0.7
)
Total, net
 
$
(27.8
)
 
$
—

 
$
27.7

 
$
(0.1
)
 
 
 
 
 
 
 
 
 
 
 
Fair Value as of December 31, 2016
Assets from coal trading activities, net
 
$
191.2

 
$
(190.5
)
 
$
—

 
$
0.7

Liabilities from coal trading activities, net
 
(249.1
)
 
190.5

 
57.4

 
(1.2
)
Total, net
 
$
(57.9
)
 
$
—

 
$
57.4

 
$
(0.5
)
(1) 
None of the net variation margin (held) posted at March 31, 2017 and December 31, 2016, 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 March 31, 2017 and December 31, 2016:
 
March 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Physical purchase/sale contracts
$
—

 
$
0.6

 
$
(0.7
)
 
$
(0.1
)
Total net financial assets (liabilities)
$
—

 
$
0.6

 
$
(0.7
)
 
$
(0.1
)
 
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
—

 
$
(0.1
)
 
$
—

 
$
(0.1
)
Physical purchase/sale contracts
—

 
0.7

 
(1.1
)
 
(0.4
)
Total net financial assets (liabilities)
$
—

 
$
0.6

 
$
(1.1
)
 
$
(0.5
)
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 purchase/sale contracts classified as Level 3 as of March 31, 2017:
 
 
Range
 
Weighted
Input
 
Low
 
High
 
Average
Credit and non-performance risk
 
26
%
 
26
%
 
26
%
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 March 31,
 
2017
 
2016
 
(Dollars in millions)
Beginning of period
$
(1.1
)
 
$
(15.6
)
Transfers out of Level 3
0.2

 
10.7

Total gains realized/unrealized:
 

 
 

Included in earnings
0.2

 
(0.1
)
Sales
—

 
(0.1
)
Settlements
—

 
1.2

End of period
$
(0.7
)
 
$
(3.9
)
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 March 31,
 
2017
 
2016
 
(Dollars in millions)
Changes in unrealized gains (losses) (1)
$
0.3

 
$
(0.1
)
(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]
.