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Segment Information - Summary of Consolidated Revenues Disaggregated by Product and Service (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue recognized		$ 6,874.1	$ 7,397.9	$ 9,350.9
Non-customer revenue		296.9	(4.1)	(72.2)
Total revenues		8,260.3	8,671.1	10,484.0
Derivative Activities - Hedge [Member]
Revenue from External Customer [Line Items]
Non-customer revenue		90.8	138.0	(39.7)
Derivative Activities - Non-hedge [Member]
Revenue from External Customer [Line Items]
Non-customer revenue	[1]	206.1	(142.1)	(32.5)
Natural Gas [Member]
Revenue from External Customer [Line Items]
Revenue recognized		1,359.0	1,321.7	1,810.0
NGL [Member]
Revenue from External Customer [Line Items]
Revenue recognized		5,181.3	5,233.8	6,886.9
Condensate and Crude Oil [Member]
Revenue from External Customer [Line Items]
Revenue recognized		264.0	716.1	457.9
Petroleum Products [Member]
Revenue from External Customer [Line Items]
Revenue recognized		69.8	126.3	196.1
Sales of Commodities [Member]
Revenue from External Customer [Line Items]
Total revenues		7,171.0	7,393.8	9,278.7
NGL Transportation, Fractionation and Services [Member]
Revenue from External Customer [Line Items]
Revenue recognized		163.1	169.4	154.6
Storage Terminaling and Export [Member]
Revenue from External Customer [Line Items]
Revenue recognized		401.9	356.4	313.0
Gathering and Processing [Member]
Revenue from External Customer [Line Items]
Revenue recognized		476.0	722.4	698.1
Other [Member]
Revenue from External Customer [Line Items]
Revenue recognized		48.3	29.1	39.6
Fees from Midstream Services [Member]
Revenue from External Customer [Line Items]
Revenue recognized		1,089.3	1,277.3	1,205.3
Total revenues		$ 1,089.3	$ 1,277.3	$ 1,205.3
[1] Represents derivative activities that are not designated as hedging instruments under ASC 815.

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