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Segment Information - Summary of Consolidated Revenues Disaggregated by Product and Service (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Revenue recognized		$ 3,201.8	$ 1,212.3	$ 6,704.3	$ 2,832.1
Non-customer revenue		(110.2)	68.3	(245.0)	228.1
Total revenues		3,415.9	1,523.5	7,048.7	3,572.4
Derivative Activities - Hedge [Member]
Revenue from External Customer [Line Items]
Non-customer revenue		(53.6)	60.2	(203.4)	120.3
Derivative Activities - Non-hedge [Member]
Revenue from External Customer [Line Items]
Non-customer revenue	[1]	(56.6)	8.1	(41.6)	107.8
Natural Gas [Member]
Revenue from External Customer [Line Items]
Revenue recognized		613.8	269.7	1,455.2	542.8
NGL [Member]
Revenue from External Customer [Line Items]
Revenue recognized		2,499.1	908.2	5,093.6	2,069.5
Condensate and Crude Oil [Member]
Revenue from External Customer [Line Items]
Revenue recognized		88.9	27.6	155.5	163.3
Petroleum Products [Member]
Revenue from External Customer [Line Items]
Revenue recognized			6.8		56.5
Gathering and Processing [Member]
Revenue from External Customer [Line Items]
Revenue recognized		168.0	107.4	284.3	223.3
Sales of Commodities [Member]
Revenue from External Customer [Line Items]
Total revenues		3,091.6	1,280.6	6,459.3	3,060.2
Other [Member]
Revenue from External Customer [Line Items]
Revenue recognized		14.2	13.5	26.9	27.3
NGL Transportation, Fractionation and Services [Member]
Revenue from External Customer [Line Items]
Revenue recognized		45.6	32.9	92.8	72.8
Storage Terminaling and Export [Member]
Revenue from External Customer [Line Items]
Revenue recognized		96.5	89.1	185.4	188.8
Fees from Midstream Services [Member]
Revenue from External Customer [Line Items]
Revenue recognized		324.3	242.9	589.4	512.2
Total revenues		$ 324.3	$ 242.9	$ 589.4	$ 512.2
[1] Represents derivative activities that are not designated as hedging instruments under ASC 815.

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