Goodwill and Intangible Assets - Changes in Carrying Value of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Accumulated amortization, beginning of period	$ (422.2)
Accumulated amortization, end of period	(545.9)	$ (422.2)
EnLink Midstream Partners, LP
Finite-lived Intangible Assets [Roll Forward]
Amortization expense	123.7	123.5	$ 127.1
Customer relationships, end of period, net	1,249.9
Customer Relationships \| EnLink Midstream Partners, LP
Finite-lived Intangible Assets [Roll Forward]
Customer relationships, beginning of period, gross	1,795.8	1,795.8	1,795.8
Accumulated amortization, beginning of period	(422.2)	(298.7)	(171.6)
Customer relationships, beginning of period, net	1,373.6	1,497.1	1,624.2
Amortization expense	(123.7)	(123.5)	(127.1)
Customer relationships, end of period, gross	1,795.8	1,795.8	1,795.8
Accumulated amortization, end of period	(545.9)	(422.2)	(298.7)
Customer relationships, end of period, net	$ 1,249.9	$ 1,373.6	$ 1,497.1

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.

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- Definition

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

+ References

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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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