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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
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,
 
2018
 
2017
 
2016
Change in fair value of derivatives
$
10.1

 
$
4.7

 
$
(20.1
)
Realized gain (loss) on derivatives
(4.9
)
 
(8.9
)
 
9.0

Gain (loss) on derivative activity
$
5.2

 
$
(4.2
)
 
$
(11.1
)
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, 2018
 
December 31, 2017
Fair value of derivative assets — current
$
28.6

 
$
6.8

Fair value of derivative assets — long-term
4.1

 
—

Fair value of derivative liabilities — current
(21.8
)
 
(8.4
)
Fair value of derivative liabilities — long-term
(2.4
)
 
—

Net fair value of derivatives
$
8.5

 
$
(1.6
)
Notional Amount and Fair Value of Derivative Instruments
 
 
 
 
December 31, 2018
Commodity
 
Instruments
 
Unit
 
Volume

 
Fair Value
NGL (short contracts)
 
Swaps
 
Gallons
 
(29.0
)
 
$
4.5

NGL (long contracts)
 
Swaps
 
Gallons
 
7.7

 
0.1

Natural Gas (short contracts)
 
Swaps
 
MMBtu
 
(9.0
)
 
(1.6
)
Natural Gas (long contracts)
 
Swaps
 
MMBtu
 
14.9

 
(1.5
)
Crude and Condensate (short contracts)
 
Swaps
 
MMbbls
 
(12.9
)
 
23.6

Crude and Condensate (long contracts)
 
Swaps
 
MMbbls
 
1.0

 
(16.6
)
Total fair value of derivatives
 
 
 
 
 
 
 
$
8.5