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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Interest Rate Derivatives
The impact of the interest rate swaps on net income is included in other income (expense) in the consolidated statements of operations as part of interest expense, net of interest income, as follows (in millions):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Settlement gains on derivatives
$
—

 
$
0.4

 
$
3.6
Components of Gain (Loss) on Derivative Activity
The components of gain (loss) on derivative activity in the consolidated statements of operations related to commodity swaps are (in millions):

 
Year Ended December 31,
 
2017
 
2016
 
2015
Change in fair value of derivatives
$
4.7

 
$
(20.1
)
 
$
(7.7
)
Realized gain (loss) on derivatives
(8.9
)
 
9.0

 
17.1

Gain (loss) on derivative activity
$
(4.2
)
 
$
(11.1
)
 
$
9.4
Fair Value of Derivative Assets and Liabilities Related to Commodity Swaps
The fair value of derivative assets and liabilities related to commodity swaps are as follows (in millions):
 
December 31, 2017
 
December 31, 2016
Fair value of derivative assets — current
$
6.8

 
$
1.3

Fair value of derivative liabilities — current
(8.4
)
 
(7.6
)
Net fair value of derivatives
$
(1.6
)
 
$
(6.3
)
Notional Amount and Fair Value of Derivative Instruments
The remaining term of the contracts extend no later than January 2019.

 
 
 
 
December 31, 2017
Commodity
 
Instruments
 
Unit
 
Volume

 
Fair Value
NGL (short contracts)
 
Swaps
 
Gallons
 
(40.0
)
 
$
(5.2
)
NGL (long contracts)
 
Swaps
 
Gallons
 
23.7

 
1.4

Natural Gas (short contracts)
 
Swaps
 
MMBtu
 
(6.9
)
 
3.8

Natural Gas (long contracts)
 
Swaps
 
MMBtu
 
17.3

 
(1.6
)
Total fair value of derivatives
 
 
 
 
 
 
 
$
(1.6
)