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Derivatives (Tables)
 6 Months Ended
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Interest Rate Derivatives [Table Text Block]
The impact of the interest rate swaps on net income is included in other income (expense) in the Condensed Consolidated Statement of Operations as part of interest expense, net, as follows (in millions):
 
Three Months Ended  
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Settlement gains on derivatives
$
—

 
$
3.6

 
$
—

 
$
3.6
Commodity Swap
The components of gain (loss) on derivative activity in the Condensed Consolidated Statements of Operations relating to commodity swaps are (in millions):
 
Three Months Ended  
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Change in fair value of derivatives
$
(8.4
)
 
$
(2.5
)
 
$
(14.4
)
 
$
(6.3
)
Realized gain on derivatives
2.7

 
3.7

 
8.3

 
7.7

    Gain (loss) on derivative activity
$
(5.7
)
 
$
1.2

 
$
(6.1
)
 
$
1.4
Fair Value of Derivative Assets and Liabilities Relating to Commodity Swaps
The fair value of derivative assets and liabilities relating to commodity swaps are as follows (in millions):
 
June 30,
2016
 
December 31,
2015
Fair value of derivative assets — current
$
5.3

 
$
16.8

Fair value of derivative liabilities — current
(5.8
)
 
(2.9
)
Fair value of derivative liabilities — long term
—

 
(0.1
)
    Net fair value of derivatives
$
(0.5
)
 
$
13.8
Notional Amount and Fair Value of Derivative Instruments
Set forth below is the summarized notional volumes and fair value of all instruments held for price risk management purposes and related physical offsets at June 30, 2016. The remaining term of the contracts extend no later than June 2017.
 
 
 
 
 
 
June 30, 2016
Commodity
 
Instruments
 
Unit
 
Volume
 
Fair Value
 
 
 
 
 
 
(In millions)
NGL (short contracts)
 
Swaps
 
Gallons
 
(31.9
)
 
$
3.4

NGL (long contracts)
 
Swaps
 
Gallons
 
11.4

 
(0.4
)
Natural Gas (short contracts)
 
Swaps
 
MMBtu
 
(6.3
)
 
(2.9
)
Natural Gas (long contracts)
 
Swaps
 
MMBtu
 
1.3

 
(0.1
)
Condensate (short contracts)
 
Swaps
 
MMBbls
 
(0.1
)
 
(0.5
)
Total fair value of derivatives
 
 
 
 
 
 
 
$
(0.5
)