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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues $ 352.7 $ 683.4 $ 1,080.6 $ 1,518.6
Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue including intersegment eliminations 128.8 225.1 383.7 460.2
Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue including intersegment eliminations 5.5 8.1 11.6 19.5
Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues       1,123.9
Revenue including intersegment eliminations 235.1 478.8 744.6  
Natural Gas Gathering        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 33.2 42.9 77.0 73.1
Natural Gas Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 33.2 42.9 77.0 73.1
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 17.9 15.1 44.4 30.4
Crude Oil Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 17.9 15.1 44.4 30.4
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 18.3 19.0 41.3 35.8
Water Gathering | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 18.3 19.0 41.3 35.8
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 7.1 8.1 17.3 10.6
Natural Gas Processing | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 7.1 8.1 17.3 10.6
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 5.7 6.2 12.0 12.2
Natural Gas Compression | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5.7 6.2 12.0 12.2
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 0.7 1.5 1.4 2.7
Crude Oil Storage | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.4 0.5 0.9 1.0
Crude Oil Storage | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.1 1.5 1.7 2.9
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 3.6 1.3 5.2 2.6
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 3.6 1.3 5.2 2.6
Crude Oil Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.9 1.0 2.0 2.0
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 1.3 1.5 2.9 3.2
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   0.2  
NGL Pipeline | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0   0.0  
NGL Pipeline | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0   0.0  
NGL Pipeline | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.2   0.2  
Crude Oil Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.8 3.3 5.4 6.3
Crude Oil Transportation | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.5 1.8 3.5 3.3
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 0.3 1.5 1.9 3.0
NGL Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2.6 2.1 4.3 6.2
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 2.6 2.1 4.3 6.2
Crude Oil Rail Loading        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.7 2.5 3.7 8.3
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 2.9 3.9 6.3 11.1
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 15.6 14.0 34.2 48.5
Natural Gas Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6.9 10.9 18.9 29.7
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 15.5 7.9 33.8 30.2
Crude Oil Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 129.7 385.6 484.7 764.0
Crude Oil Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 34.8 110.2 155.9 241.8
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 102.0 291.4 352.2 581.5
NGL Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 95.1 139.8 253.0 370.4
NGL Product Sales | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3.0 10.4 12.5 22.3
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 92.4 133.9 252.7 355.4
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.3 0.6 0.9 0.8
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 1.2 0.7 2.3
Other revenue | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.2 0.3 0.7 0.3
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues (16.7) (28.6) (59.3) (85.0)
Intersegment Eliminations | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenues 14.3 25.4 54.3 78.2
Intersegment Eliminations | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 2.4 3.2 5.0 6.8
Intersegment Eliminations | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues (16.7) (28.6) (59.3) (85.0)
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 (0.8) (0.5) (1.2) (1.2)
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 (0.4) (0.5) (0.9) (1.2)
Intersegment Eliminations | NGL Pipeline        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0   0.0  
Intersegment Eliminations | Crude Oil Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0 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 (1.2) (1.4) (2.6) (2.8)
Intersegment Eliminations | Natural Gas Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (6.8) (4.8) (18.5) (11.4)
Intersegment Eliminations | Crude Oil Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (7.1) (16.0) (23.4) (59.3)
Intersegment Eliminations | NGL Product Sales        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.3) (4.5) (12.2) (7.3)
Intersegment Eliminations | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (0.1) (0.9) (0.5) (1.8)
Revenue from Contract with Customer        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 334.4 643.0 987.0 1,373.9
Revenue from Contract with Customer | Gathering and Processing Operations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 128.8 225.1 383.7 460.2
Revenue from Contract with Customer | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5.5 8.1 11.6 19.5
Revenue from Contract with Customer | Marketing Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 216.8 438.4 651.0 979.2
Revenue from Contract with Customer | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (16.7) (28.6) (59.3) (85.0)
Product and Service, Other        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues 18.3 40.4 93.6 144.7
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 18.3 40.4 93.6 144.7
Product and Service, Other | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Non-Topic 606 revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0