Revenues (Disaggregation of Revenues) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 4,569.0	$ 2,254.3	$ 3,181.9
Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	139.5	140.6	163.2
Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	73.1	95.3	75.0
Water Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	94.0	92.6	79.6
Natural Gas Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	29.4	31.9	28.9
Natural Gas Compression
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	17.1	23.9	24.9
Crude Oil Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.5	2.7	5.0
NGL Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	11.5	13.1	6.3
Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	2.6	4.1	5.2
Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	2.6	8.0	12.7
NGL Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	17.3	10.9	11.7
Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	4.6	7.4	11.0
Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	327.1	91.5	95.7
Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1,556.6	899.9	1,726.6
NGL Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1,800.8	614.6	680.7
Other revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1.7	1.5	1.9
NGL Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Water Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.2
NGL Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.2	0.3
Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	490.4	216.0	253.3
Gathering and Processing North Segment | Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	56.3	53.4	51.2
Gathering and Processing North Segment | Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	73.1	95.3	75.0
Gathering and Processing North Segment | Water Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	94.0	92.6	79.6
Gathering and Processing North Segment | Natural Gas Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	24.4	22.4	18.9
Gathering and Processing North Segment | Natural Gas Compression
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing North Segment | Crude Oil Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.3	1.1	1.9
Gathering and Processing North Segment | NGL Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing North Segment | Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing North Segment | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	2.7	6.2	7.0
Gathering and Processing North Segment | NGL Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing North Segment | Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing North Segment | Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	171.4	53.7	55.6
Gathering and Processing North Segment | Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	401.5	292.2	532.1
Gathering and Processing North Segment | NGL Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	209.4	54.0	40.5
Gathering and Processing North Segment | Other revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing North Segment | NGL Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Gathering and Processing North Segment | Water Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Gathering and Processing North Segment | NGL Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0
Gathering and Processing North Segment | Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	0.9	0.0	0.0
Gathering and Processing South Segment | Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	83.2	87.2	112.0
Gathering and Processing South Segment | Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | Water Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | Natural Gas Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	5.0	9.5	10.0
Gathering and Processing South Segment | Natural Gas Compression
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	17.1	23.9	24.9
Gathering and Processing South Segment | Crude Oil Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | NGL Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | NGL Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.6	(0.3)	1.2
Gathering and Processing South Segment | Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | NGL Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.9
Gathering and Processing South Segment | Other revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Gathering and Processing South Segment | NGL Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Gathering and Processing South Segment | Water Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Gathering and Processing South Segment | NGL Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0
Gathering and Processing South Segment | Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	0.0	0.0	0.0
Storage and Logistics | Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Storage and Logistics | Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Storage and Logistics | Water Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Storage and Logistics | Natural Gas Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Storage and Logistics | Natural Gas Compression
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Storage and Logistics | Crude Oil Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.5	1.9	3.5
Storage and Logistics | NGL Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	11.5	13.1	6.3
Storage and Logistics | Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	2.6	4.1	5.2
Storage and Logistics | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	1.9	5.8
Storage and Logistics | NGL Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	17.3	10.9	11.7
Storage and Logistics | Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	4.6	7.4	11.0
Storage and Logistics | Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	326.2	90.9	72.3
Storage and Logistics | Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1,237.7	660.7	1,315.6
Storage and Logistics | NGL Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1,796.6	614.2	659.3
Storage and Logistics | Other revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1.7	1.5	1.9
Storage and Logistics | NGL Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Storage and Logistics | Water Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.2
Storage and Logistics | NGL Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.2	0.3
Storage and Logistics | Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	489.5	216.0	253.3
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(459.3)	(159.8)	(175.0)
Intersegment Eliminations | Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Water Gathering
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Natural Gas Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Natural Gas Compression
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Crude Oil Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	(0.3)	(0.3)	(0.4)
Intersegment Eliminations | NGL Storage
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	(0.1)	(0.1)	(0.1)
Intersegment Eliminations | NGL Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	(171.1)	(52.8)	(33.4)
Intersegment Eliminations | Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	(82.6)	(53.0)	(121.1)
Intersegment Eliminations | NGL Product Sales
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	(205.2)	(53.6)	(20.0)
Intersegment Eliminations | Other revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0	0.0
Intersegment Eliminations | NGL Processing
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Intersegment Eliminations | Water Transportation
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues			0.0
Intersegment Eliminations | NGL Pipeline
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.0
Intersegment Eliminations | Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	0.0	0.0	0.0
Operating Segments | Gathering and Processing North Segment
Disaggregation of Revenue [Line Items]
Revenues	1,034.0	670.9	861.8
Operating Segments | Gathering and Processing South Segment
Disaggregation of Revenue [Line Items]
Revenues	105.9	120.3	149.0
Operating Segments | Storage and Logistics
Disaggregation of Revenue [Line Items]
Revenues	3,888.4	1,622.9	2,346.1
Revenue from Contract with Customer
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	4,078.6	2,038.3	2,928.6
Revenue from Contract with Customer | Gathering and Processing North Segment
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	1,033.1	670.9	861.8
Revenue from Contract with Customer | Gathering and Processing South Segment
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	105.9	120.3	149.0
Revenue from Contract with Customer | Storage and Logistics
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	3,398.9	1,406.9	2,092.8
Revenue from Contract with Customer | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	$ (459.3)	$ (159.8)	$ (175.0)