Derivatives - Components of Gain (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives
Realized gain (loss) on derivatives	$ 7.2	$ (16.9)	$ 7.0
Gain (loss) on derivative activity	(22.0)	14.4	5.2
EnLink Midstream Partners, LP \| Commodity Swaps
Derivatives
Change in fair value of derivatives	(10.5)	(0.1)	10.1
Realized gain (loss) on derivatives	(11.5)	14.5	(4.9)
Gain (loss) on derivative activity	$ (22.0)	$ 14.4	$ 5.2

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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