Acquisition - Narrative (Details) - USD ($) $ in Millions			1 Months Ended		12 Months Ended
	Jan. 07, 2016	Mar. 07, 2014	Jan. 31, 2018	Jan. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Consideration	$ 1,400.0
First installment	$ 1,020.0
Acquisition of business					$ 0.0	$ 0.0	$ 791.5
EOGP
Business Acquisition [Line Items]
Acquired voting interest	16.10%				16.10%
Consideration	$ 1,441.6
First installment	1,020.0
Second installment				$ 250.0
Final installment payable			$ 250.0
Cash	805.8
Acquisition of business	$ 22.2
Intangible asset, useful life	15 years
Direct transaction costs							$ 4.4	$ 4.4
Recognized revenue								246.1
Net gain (loss) related to assets acquired								$ (34.1)
EOGP | EnLink Midstream Partners, LP
Business Acquisition [Line Items]
Acquired voting interest	83.90%
Cash	$ 783.6
Common Unit
Business Acquisition [Line Items]
Equity interest issued or issuable, number of shares (in shares)		115,495,669
Common Unit | EOGP
Business Acquisition [Line Items]
Equity interest issued or issuable, number of shares (in shares)	15,564,009