The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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-Section 50
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Derivative Instruments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative asset	$ 0.4
Realization of gain, net of taxes	0.3
Gas hedges
Derivatives, Fair Value [Line Items]
Net settlement of hedges	$ 1.5	$ 1.8	$ 15.9
NGL hedges
Derivatives, Fair Value [Line Items]
Net settlement of hedges			0.5
Crude Oil
Derivatives, Fair Value [Line Items]
Net settlement of hedges			$ 0.6