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Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues $ 1,226.3 $ 519.2 $ 3,188.6 $ 1,599.8
Natural Gas Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 35.3 30.3 100.0 107.3
Crude Oil Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 17.1 22.5 56.2 66.9
Water Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 24.8 25.1 69.5 66.4
Natural Gas Processing        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 7.2 6.1 21.5 23.4
Natural Gas Compression        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.7 6.0 12.1 18.0
Crude Oil Storage        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.1 0.6 0.4 2.0
NGL Storage        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2.6 3.4 8.7 8.6
Crude Oil Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.6 1.1 2.0 3.1
Crude Oil Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.7 1.2 1.8 6.6
NGL Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4.1 3.1 12.5 7.4
Crude Oil Rail Loading        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.2 1.8 3.4 5.5
Natural Gas Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 84.7 22.4 225.2 56.6
Crude Oil Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 411.6 216.7 1,161.5 701.4
NGL Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 501.6 145.6 1,212.7 398.6
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.5 0.4 1.4 1.3
NGL Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.1 0.2
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues (127.9) (46.8) (322.9) (106.1)
Intersegment Eliminations | Natural Gas Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Crude Oil Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Water Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Natural Gas Processing        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Natural Gas Compression        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Crude Oil Storage        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.4) (0.3) (1.8) (1.5)
Intersegment Eliminations | NGL Storage        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Crude Oil Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.9) (0.6) (2.5) (1.5)
Intersegment Eliminations | Crude Oil Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.1) 0.0 (0.1) 0.0
Intersegment Eliminations | NGL Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Intersegment Eliminations | Crude Oil Rail Loading        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (1.0) (0.9) (3.4) (3.5)
Intersegment Eliminations | Natural Gas Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (42.7) (12.9) (111.7) (31.4)
Intersegment Eliminations | Crude Oil Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (25.1) (15.6) (62.5) (39.0)
Intersegment Eliminations | NGL Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (57.6) (16.4) (140.5) (28.6)
Intersegment Eliminations | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.1) (0.1) (0.4) (0.6)
Intersegment Eliminations | NGL Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.0 0.0
Operating Segments | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenues 296.8 190.1 814.0 573.8
Operating Segments | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues 1,053.1 370.5 2,683.7 1,115.1
Operating Segments | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 4.3 5.4 13.8 17.0
Operating Segments | Natural Gas Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 35.3 30.3 100.0 107.3
Operating Segments | Natural Gas Gathering | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Natural Gas Gathering | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 17.1 22.5 56.2 66.9
Operating Segments | Crude Oil Gathering | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Gathering | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Water Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 24.8 25.1 69.5 66.4
Operating Segments | Water Gathering | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Water Gathering | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Natural Gas Processing | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 7.2 6.1 21.5 23.4
Operating Segments | Natural Gas Processing | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Natural Gas Processing | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Natural Gas Compression | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.7 6.0 12.1 18.0
Operating Segments | Natural Gas Compression | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Natural Gas Compression | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Storage | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.1 0.1 0.3 1.0
Operating Segments | Crude Oil Storage | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Storage | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.4 0.8 1.9 2.5
Operating Segments | NGL Storage | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | NGL Storage | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2.6 3.4 8.7 8.6
Operating Segments | NGL Storage | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Pipeline | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Pipeline | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Pipeline | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.5 1.7 4.5 4.6
Operating Segments | Crude Oil Transportation | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.8 1.2 1.9 4.7
Operating Segments | Crude Oil Transportation | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 1.9
Operating Segments | Crude Oil Transportation | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | NGL Transportation | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | NGL Transportation | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4.1 3.1 12.5 7.4
Operating Segments | NGL Transportation | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Rail Loading | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Rail Loading | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Rail Loading | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2.2 2.7 6.8 9.0
Operating Segments | Natural Gas Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 42.9 13.0 112.5 31.9
Operating Segments | Natural Gas Product Sales | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 84.5 22.3 224.4 56.1
Operating Segments | Natural Gas Product Sales | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Crude Oil Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 105.4 69.4 297.1 225.3
Operating Segments | Crude Oil Product Sales | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 331.3 162.9 926.9 515.1
Operating Segments | Crude Oil Product Sales | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | NGL Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 59.1 16.4 142.3 28.9
Operating Segments | NGL Product Sales | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 500.1 145.6 1,210.9 398.3
Operating Segments | NGL Product Sales | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Other revenue | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 0.0
Operating Segments | Other revenue | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.4 0.3 1.2 1.0
Operating Segments | Other revenue | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.2 0.2 0.6 0.9
Operating Segments | NGL Pipeline | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.0 0.0
Operating Segments | NGL Pipeline | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.1 0.2
Operating Segments | NGL Pipeline | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.0 0.0
Revenue from Contract with Customer        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,095.8 486.3 2,889.0 1,473.3
Revenue from Contract with Customer | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (127.9) (46.8) (322.9) (106.1)
Revenue from Contract with Customer | Operating Segments | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 296.4 190.1 813.4 573.8
Revenue from Contract with Customer | Operating Segments | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 923.0 337.6 2,384.7 988.6
Revenue from Contract with Customer | Operating Segments | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4.3 5.4 13.8 17.0
Product and Service, Other        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 130.5 32.9 299.6 126.5
Product and Service, Other | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 0.0 0.0 0.0 0.0
Product and Service, Other | Operating Segments | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 0.4 0.0 0.6 0.0
Product and Service, Other | Operating Segments | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 130.1 32.9 299.0 126.5
Product and Service, Other | Operating Segments | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0