Derivatives - Components of Commodity Swap Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivatives
Change in fair value of derivatives	$ (1.2)	$ (2.2)	$ (32.9)	$ (8.0)
Realized gain (loss) on derivatives			(37.5)	(7.3)
Loss on derivative activity	(33.6)	(5.1)	(155.2)	(8.3)
EnLink Midstream Partners, LP \| Commodity swaps
Derivatives
Change in fair value of derivatives	(1.2)	(2.2)	(32.9)	(8.0)
Realized gain (loss) on derivatives	(32.4)	(2.9)	(122.3)	(0.3)
Loss on derivative activity	$ (33.6)	$ (5.1)	$ (155.2)	$ (8.3)

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.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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