Derivatives - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives
Fair value of derivative assets — current	$ 28.6	$ 6.8
Fair value of derivative assets — long-term	4.1	0.0
Fair value of derivative assets — long-term	(21.8)	(8.4)
Fair value of derivative liabilities — long-term	(2.4)	0.0
Commodity Swaps
Derivatives
Net fair value of derivatives	8.5
EnLink Midstream Partners, LP \| Commodity Swaps
Derivatives
Fair value of derivative assets — current	28.6	6.8
Fair value of derivative assets — long-term	4.1	0.0
Fair value of derivative assets — long-term	(21.8)	(8.4)
Fair value of derivative liabilities — long-term	(2.4)	0.0
Net fair value of derivatives	$ 8.5	$ (1.6)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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