Derivatives - Components of Commodity Swap Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivatives
Change in fair value of interest rate swaps	$ (22.9)	$ 18.2	$ (19.0)	$ 38.4
Gain (loss) on derivative activity	(22.0)	20.5	1.2	(6.2)
Commodity swaps
Derivatives
Change in fair value of interest rate swaps	(22.9)	18.2
Realized gain (loss) on derivatives	0.9	2.3
Gain (loss) on derivative activity	$ (22.0)	$ 20.5
EnLink Midstream Partners, LP \| Commodity swaps
Derivatives
Change in fair value of interest rate swaps			(19.0)	38.4
Realized gain (loss) on derivatives			20.2	(44.6)
Gain (loss) on derivative activity			$ 1.2	$ (6.2)

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.

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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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