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Coal Trading (Tables)
 3 Months Ended
Mar. 31, 2018
Coal Trading [Abstract]  
Trading revenues by type of instrument
Trading revenues (losses) recognized during the periods presented below were as follows:
 
 
Successor
Predecessor
Trading Revenues by Type of Instrument
 
Three Months Ended March 31, 2018
Three Months Ended March 31, 2017
 
 
(Dollars in millions)
Futures, swaps and options
 
$
(16.9
)
$
(10.2
)
Physical purchase/sale contracts
 
37.0

25.2

Total trading revenues
 
$
20.1

$
15.0
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, 2018 and December 31, 2017 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 Posted (1)
 
Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets
 
 
(Dollars in millions)
 
 
Fair Value as of March 31, 2018
Assets from coal trading activities, net
 
$
53.6

 
$
(42.4
)
 
$
—

 
$
11.2

Liabilities from coal trading activities, net
 
(57.9
)
 
42.4

 
6.7

 
(8.8
)
Total, net
 
$
(4.3
)
 
$
—

 
$
6.7

 
$
2.4

 
 
 
 
 
 
 
 
 
 
 
Fair Value as of December 31, 2017
Assets from coal trading activities, net
 
$
77.1

 
$
(74.5
)
 
$
—

 
$
2.6

Liabilities from coal trading activities, net
 
(122.0
)
 
74.5

 
35.8

 
(11.7
)
Total, net
 
$
(44.9
)
 
$
—

 
$
35.8

 
$
(9.1
)
(1) 
None of the net variation margin posted at March 31, 2018 and December 31, 2017 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, 2018 and December 31, 2017:
 
March 31, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
0.2

 
$
—

 
$
—

 
$
0.2

Physical purchase/sale contracts
—

 
2.2

 
—

 
2.2

Total net financial assets
$
0.2

 
$
2.2

 
$
—

 
$
2.4

 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
(3.0
)
 
$
(4.2
)
 
$
—

 
$
(7.2
)
Physical purchase/sale contracts
—

 
(1.9
)
 
—

 
(1.9
)
Total net financial liabilities
$
(3.0
)
 
$
(6.1
)
 
$
—

 
$
(9.1
)
Schedule Of Future Realization Of Trading Portfolio
As of March 31, 2018, the timing of the estimated future realization of the value of the Company’s trading portfolio was as follows:
 
 
Percentage of
Year of Expiration
 
Portfolio Total
2018
 
83
 %
2019
 
25
 %
2020
 
(8
)%
 
 
100
 %