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Coal Trading (Tables) - Coal Trading [Member]
 12 Months Ended
Dec. 31, 2016
Coal Trading [Line Items]  
Trading revenue by type of instrument
Trading revenues recognized during the years ended December 31, 2016, 2015 and 2014 were as follows:
 
 
Year Ended December 31,
Trading Revenues by Type of Instrument
 
2016
 
2015
 
2014
 
 
(Dollars in millions)
Commodity futures, swaps and options
 
$
(96.5
)
 
$
107.3

 
$
92.3

Physical commodity purchase/sale contracts
 
85.6

 
(64.5
)
 
(33.9
)
Total trading revenues
 
$
(10.9
)
 
$
42.8

 
$
58.4
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 December 31, 2016 and 2015 is set forth below:
Affected line item in the consolidated balance sheets
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Variation margin (held) posted (1)
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets
 
 
(Dollars in millions)
 
 
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
)
 
 
 
 
 
 
 
 
 
 
 
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) posted at December 31, 2016 and 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 December 31, 2016 and 2015:
 
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Commodity futures, swaps and options
$
—

 
$
(0.1
)
 
$
—

 
$
(0.1
)
Physical commodity purchase/sale contracts
—

 
0.7

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

 
$
0.6

 
$
(1.1
)
 
$
(0.5
)
 
December 31, 2015
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
 
(Dollars in millions)
 
 
Commodity futures, swaps and options
$
—

 
$
3.3

 
$
—

 
$
3.3

Physical commodity purchase/sale contracts
—

 
20.2

 
(15.6
)
 
4.6

Total net financial assets (liabilities)
$
—

 
$
23.5

 
$
(15.6
)
 
$
7.9
Schedule of quantitative unobservable inputs, physical commodity purchase/sale contracts
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 December 31, 2016:
 
 
Range
 
Weighted
Input
 
Low
 
High
 
Average
Quality adjustments
 
2
%
 
2
%
 
2
%
Credit and non-performance risk
 
26
%
 
26
%
 
26
%
Change in the Company's recurring Level 3 net financial assets
The following table summarizes the changes in the Company’s recurring Level 3 net financial assets:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Beginning of period
$
(15.6
)
 
$
2.1

 
$
2.1

Transfers into Level 3
5.3

 
(4.4
)
 
—

Transfers out of Level 3
(0.4
)
 
—

 
—

Total gains realized/unrealized:
 

 
 

 
 

Included in earnings
(2.4
)
 
(10.1
)
 
6.7

Purchases
—

 
(0.5
)
 
—

Sales
—

 
(0.1
)
 
—

Settlements
12.0

 
(2.6
)
 
(6.7
)
End of period
$
(1.1
)
 
$
(15.6
)
 
$
2.1
Changes in unrealized gains (losses) relating to Level 3 net financial assets
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:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Changes in unrealized (losses) gains (1)
$
—

 
$
(6.2
)
 
$
2.1

(1) 
Within the consolidated statements of operations and 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 the Company's trading portfolio
As of December 31, 2016, the estimated future realization of the value of the Company’s trading portfolio is expected to all be realized in 2017.