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Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues $ 519.2 $ 823.6 $ 1,599.8 $ 2,342.2
Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue including intersegment eliminations 190.1 291.4 573.8 751.6
Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue including intersegment eliminations 5.4 7.6 17.0 27.1
Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues       1,685.6
Revenue including intersegment eliminations 370.5 561.7 1,115.1  
Natural Gas Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 30.3 43.7 107.3 116.8
Natural Gas Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 30.3 43.7 107.3 116.8
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
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
Crude Oil Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22.5 20.1 66.9 50.5
Crude Oil Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22.5 20.1 66.9 50.5
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
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
Water Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 25.1 21.3 66.4 57.1
Water Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 25.1 21.3 66.4 57.1
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
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
Natural Gas Processing        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6.1 8.9 23.4 19.5
Natural Gas Processing | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6.1 8.9 23.4 19.5
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
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
Natural Gas Compression        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6.0 6.4 18.0 18.6
Natural Gas Compression | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6.0 6.4 18.0 18.6
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
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
Crude Oil Storage        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.6 1.4 2.0 4.1
Crude Oil Storage | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.1 0.4 1.0 1.4
Crude Oil Storage | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.8 1.5 2.5 4.4
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
NGL Storage        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.4 1.6 8.6 4.2
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
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
NGL Storage | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.4 1.6 8.6 4.2
Crude Oil Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.1 1.6 3.1 3.6
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
Crude Oil Pipeline | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.7 2.6 4.6 5.8
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
NGL Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.2  
NGL Pipeline | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.0  
NGL Pipeline | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.0  
NGL Pipeline | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.2  
Crude Oil Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.2 3.5 6.6 9.8
Crude Oil Transportation | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.2 2.2 4.7 5.5
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
Crude Oil Transportation | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 1.4 1.9 4.4
NGL Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.1 2.3 7.4 8.5
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
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
NGL Transportation | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.1 2.3 7.4 8.5
Crude Oil Rail Loading        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.8 1.2 5.5 9.5
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
Crude Oil Rail Loading | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2.7 2.4 9.0 13.5
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
Natural Gas Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22.4 17.6 56.6 66.1
Natural Gas Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 13.0 10.3 31.9 40.0
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
Natural Gas Product Sales | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22.3 13.8 56.1 44.0
Crude Oil Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 216.7 529.5 701.4 1,293.5
Crude Oil Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 69.4 170.0 225.3 411.8
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
Crude Oil Product Sales | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 162.9 383.6 515.1 965.1
NGL Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 145.6 124.5 398.6 494.9
NGL Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 16.4 8.1 28.9 30.4
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
NGL Product Sales | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 145.6 119.2 398.3 474.6
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.4 0.6 1.3 1.4
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
Other revenue | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.2 1.1 0.9 3.4
Other revenue | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.3 0.4 1.0 0.7
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues (46.8) (37.1) (106.1) (122.1)
Intersegment Eliminations | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenues 44.9 33.6 99.2 111.8
Intersegment Eliminations | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 1.9 3.5 6.9 10.3
Intersegment Eliminations | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues (46.8) (37.1) (106.1) (122.1)
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 (0.3) (0.5) (1.5) (1.7)
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 (0.6) (1.0) (1.5) (2.2)
Intersegment Eliminations | NGL Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     0.0  
Intersegment Eliminations | Crude Oil Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 (0.1) 0.0 (0.1)
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 (0.9) (1.2) (3.5) (4.0)
Intersegment Eliminations | Natural Gas Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (12.9) (6.5) (31.4) (17.9)
Intersegment Eliminations | Crude Oil Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (15.6) (24.1) (39.0) (83.4)
Intersegment Eliminations | NGL Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (16.4) (2.8) (28.6) (10.1)
Intersegment Eliminations | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.1) (0.9) (0.6) (2.7)
Revenue from Contract with Customer        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 486.3 784.2 1,473.3 2,158.1
Revenue from Contract with Customer | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 190.1 291.4 573.8 751.6
Revenue from Contract with Customer | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5.4 7.6 17.0 27.1
Revenue from Contract with Customer | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 337.6 522.3 988.6 1,501.5
Revenue from Contract with Customer | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (46.8) (37.1) (106.1) (122.1)
Product and Service, Other        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 32.9 39.4 126.5 184.1
Product and Service, Other | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 0.0 0.0 0.0 0.0
Product and Service, Other | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 0.0 0.0 0.0 0.0
Product and Service, Other | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 32.9 39.4 126.5 184.1
Product and Service, Other | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0