The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 2
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Intangible Assets - Changes in Carrying Value (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Finite-lived Intangible Assets [Roll Forward]
Accumulated Amortization, Beginning Balance			$ (298.7)
Accumulated Amortization, Amortization expense	$ (30.9)	$ (35.5)	(61.7)	$ (65.0)
Accumulated Amortization, Ending Balance	(360.4)		(360.4)
EnLink Midstream Partners, LP
Finite-lived Intangible Assets [Roll Forward]
Net Carrying Amount, Ending Balance	1,435.4		1,435.4
Customer relationships \| EnLink Midstream Partners, LP
Finite-lived Intangible Assets [Roll Forward]
Gross Carrying Amount, Beginning Balance			1,795.8
Accumulated Amortization, Beginning Balance			(298.7)
Net Carrying Amount, Beginning Balance			1,497.1
Accumulated Amortization, Amortization expense			(61.7)
Gross Carrying Amount, Ending Balance	1,795.8		1,795.8
Accumulated Amortization, Ending Balance	(360.4)		(360.4)
Net Carrying Amount, Ending Balance	$ 1,435.4		$ 1,435.4