Derivatives - Commodities (Details) - EnLink Midstream Partners, LP gal in Millions, MMBbls in Millions, MMBTU in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) MMBTU gal MMBbls	Dec. 31, 2018 USD ($)
Derivatives
Fair Value	$ 6.5	$ 8.5
Commodity
Derivatives
Fair Value	6.5
Maximum loss if counterparties fail to perform	13.3
Possible reduction in maximum loss if counterparties fail to perform	$ 7.5
Commodity | NGL | Short
Derivatives
Notional amount (in gallons and mmbls) | gal	13.8
Fair Value	$ 1.2
Commodity | NGL | Long
Derivatives
Notional amount (in gallons and mmbls) | gal	2.6
Fair Value	$ (0.1)
Commodity | Natural Gas | Short
Derivatives
Notional amount (in mmbtu) | MMBTU	3.0
Fair Value	$ 0.0
Commodity | Natural Gas | Long
Derivatives
Notional amount (in mmbtu) | MMBTU	4.6
Fair Value	$ (1.1)
Commodity | Crude and condensate | Short
Derivatives
Notional amount (in gallons and mmbls) | MMBbls	12.7
Fair Value	$ 9.7
Commodity | Crude and condensate | Long
Derivatives
Notional amount (in gallons and mmbls) | MMBbls	1.5
Fair Value	$ (3.2)