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Segment Information - Financial Information and Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting      
Revenue from contracts with customers $ 1,777.4 $ 1,761.2  
Cost of sales [1] (1,363.4) (1,381.5)  
Operating expenses (114.5) (109.2)  
Gain on derivative activity 1.8 0.5  
Segment profit 301.3 271.0  
Depreciation and amortization (152.1) (138.1)  
Impairments (186.5) 0.0  
Goodwill 1,123.7 1,542.2 $ 1,310.2
Capital expenditures 251.0 181.2  
Total identifiable assets 10,506.8   10,694.1
Corporate      
Segment Reporting      
Revenue from contracts with customers (257.3) (197.9)  
Cost of sales 257.3 197.9  
Operating expenses 0.0 0.0  
Gain on derivative activity 1.8 0.5  
Segment profit 1.8 0.5  
Depreciation and amortization (2.0) (2.0)  
Impairments 0.0    
Goodwill 0.0 1,119.9 1,119.9
Capital expenditures 1.6 1.2  
Total identifiable assets 225.6   1,345.1
Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 742.6 716.8  
Cost of sales (676.2) (674.1)  
Operating expenses (27.8) (23.8)  
Gain on derivative activity 0.0 0.0  
Segment profit 38.6 18.9  
Depreciation and amortization (27.9) (26.8)  
Impairments 0.0    
Goodwill 184.6 29.3 0.0
Capital expenditures 95.9 63.6  
Total identifiable assets 2,382.6   2,096.8
North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 174.3 167.0  
Cost of sales (73.7) (49.9)  
Operating expenses (25.7) (28.4)  
Gain on derivative activity 0.0 0.0  
Segment profit 74.9 88.7  
Depreciation and amortization (34.3) (31.3)  
Impairments 0.0    
Goodwill 125.7 202.7 0.0
Capital expenditures 4.3 2.5  
Total identifiable assets 1,365.2   1,308.2
Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 319.7 255.4  
Cost of sales (184.2) (139.3)  
Operating expenses (25.4) (20.7)  
Gain on derivative activity 0.0 0.0  
Segment profit 110.1 95.4  
Depreciation and amortization (46.1) (42.1)  
Impairments 0.0    
Goodwill 813.4 190.3 190.3
Capital expenditures 108.2 103.9  
Total identifiable assets 3,906.6   3,209.5
Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 798.1 819.9  
Cost of sales (686.6) (716.1)  
Operating expenses (35.6) (36.3)  
Gain on derivative activity 0.0 0.0  
Segment profit 75.9 67.5  
Depreciation and amortization (41.8) (35.9)  
Impairments (186.5)    
Goodwill 0.0 0.0 0.0
Capital expenditures 41.0 10.0  
Total identifiable assets 2,626.8   $ 2,734.5
Product sales      
Segment Reporting      
Revenue from contracts with customers 1,530.9 1,499.2  
Product sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Product sales | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 616.7 615.4  
Product sales | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 59.9 45.3  
Product sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 100.2 71.9  
Product sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 754.1 766.6  
Product sales, Natural gas sales      
Segment Reporting      
Revenue from contracts with customers 270.5 256.1  
Product sales, Natural gas sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Product sales, Natural gas sales | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 36.1 37.7  
Product sales, Natural gas sales | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 50.6 45.3  
Product sales, Natural gas sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 61.6 48.1  
Product sales, Natural gas sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 122.2 125.0  
Product sales, NGL sales      
Segment Reporting      
Revenue from contracts with customers 591.1 610.8  
Product sales, NGL sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Product sales, NGL sales | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers (0.2) 0.5  
Product sales, NGL sales | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 9.3 0.0  
Product sales, NGL sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 8.9 1.9  
Product sales, NGL sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 573.1 608.4  
Product sales, Crude oil and condensate sales      
Segment Reporting      
Revenue from contracts with customers 669.2 632.3  
Product sales, Crude oil and condensate sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Product sales, Crude oil and condensate sales | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 580.8 577.2  
Product sales, Crude oil and condensate sales | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Product sales, Crude oil and condensate sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 29.6 21.9  
Product sales, Crude oil and condensate sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 58.8 33.2  
Product sales, Other      
Segment Reporting      
Revenue from contracts with customers 0.1    
Product sales, Other | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Other | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Other | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Other | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.1    
Product sales, Other | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales—related parties      
Segment Reporting      
Revenue from contracts with customers 0.0 3.6  
Product sales—related parties | Corporate      
Segment Reporting      
Revenue from contracts with customers (260.0) (197.9)  
Product sales—related parties | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 101.2 85.4  
Product sales—related parties | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 29.5 9.4  
Product sales—related parties | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 126.1 101.0  
Product sales—related parties | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 3.2 5.7  
Product sales, Natural gas sales, related party      
Segment Reporting      
Revenue from contracts with customers   0.5  
Product sales, Natural gas sales, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers   0.0  
Product sales, Natural gas sales, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Product sales, Natural gas sales, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Product sales, Natural gas sales, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.5  
Product sales, Natural gas sales, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Product sales, NGL sales, related party      
Segment Reporting      
Revenue from contracts with customers 0.0 2.4  
Product sales, NGL sales, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers (255.0) (196.2)  
Product sales, NGL sales, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 97.2 83.9  
Product sales, NGL sales, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 28.5 9.0  
Product sales, NGL sales, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 126.1 100.1  
Product sales, NGL sales, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 3.2 5.6  
Product sales, Crude oil and condensate sales, related party      
Segment Reporting      
Revenue from contracts with customers 0.0 0.7  
Product sales, Crude oil and condensate sales, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers (5.0) (1.7)  
Product sales, Crude oil and condensate sales, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 4.0 1.5  
Product sales, Crude oil and condensate sales, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 1.0 0.4  
Product sales, Crude oil and condensate sales, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.4  
Product sales, Crude oil and condensate sales, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.1  
Midstream services      
Segment Reporting      
Revenue from contracts with customers 246.5 92.2  
Midstream services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 24.7 11.7  
Midstream services | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 84.9 8.1  
Midstream services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 93.1 24.8  
Midstream services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 43.8 47.6  
Midstream services, Gathering and transportation      
Segment Reporting      
Revenue from contracts with customers 146.4 47.2  
Midstream services, Gathering and transportation | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, Gathering and transportation | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 10.3 6.2  
Midstream services, Gathering and transportation | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 63.6 7.8  
Midstream services, Gathering and transportation | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 55.3 15.6  
Midstream services, Gathering and transportation | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 17.2 17.6  
Midstream services, Processing      
Segment Reporting      
Revenue from contracts with customers 63.8 13.4  
Midstream services, Processing | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, Processing | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 7.7 3.8  
Midstream services, Processing | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 21.1 0.0  
Midstream services, Processing | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 34.1 9.0  
Midstream services, Processing | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.9 0.6  
Midstream services, NGL services      
Segment Reporting      
Revenue from contracts with customers 11.7 16.6  
Midstream services, NGL services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, NGL services | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, NGL services | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, NGL services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, NGL services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 11.7 16.6  
Midstream services, Crude services      
Segment Reporting      
Revenue from contracts with customers 23.0 12.9  
Midstream services, Crude services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, Crude services | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 5.2 0.0  
Midstream services, Crude services | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, Crude services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 4.0 0.1  
Midstream services, Crude services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 13.8 12.8  
Midstream services, Other services      
Segment Reporting      
Revenue from contracts with customers 1.6 2.1  
Midstream services, Other services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, Other services | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 1.5 1.7  
Midstream services, Other services | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.2 0.3  
Midstream services, Other services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers (0.3) 0.1  
Midstream services, Other services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.2 0.0  
Midstream services—related parties      
Segment Reporting      
Revenue from contracts with customers 0.0 166.2  
Midstream services—related parties | Corporate      
Segment Reporting      
Revenue from contracts with customers 2.7 0.0  
Midstream services—related parties | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 4.3  
Midstream services—related parties | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 104.2  
Midstream services—related parties | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.3 57.7  
Midstream services—related parties | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers (3.0) 0.0  
Midstream services, Gathering and transportation, related party      
Segment Reporting      
Revenue from contracts with customers   87.3  
Midstream services, Gathering and transportation, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Gathering and transportation, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Gathering and transportation, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   52.6  
Midstream services, Gathering and transportation, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   34.7  
Midstream services, Gathering and transportation, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Processing, related party      
Segment Reporting      
Revenue from contracts with customers   73.7  
Midstream services, Processing, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Processing, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Processing, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   51.6  
Midstream services, Processing, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   22.1  
Midstream services, Processing, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
NGL services—related parties      
Segment Reporting      
Revenue from contracts with customers 0.0    
NGL services—related parties | Corporate      
Segment Reporting      
Revenue from contracts with customers 3.0    
NGL services—related parties | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
NGL services—related parties | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
NGL services—related parties | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
NGL services—related parties | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers (3.0)    
Midstream services, Crude services, related party      
Segment Reporting      
Revenue from contracts with customers 0.0 5.0  
Midstream services, Crude services, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers (0.3) 0.0  
Midstream services, Crude services, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 4.3  
Midstream services, Crude services, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services, Crude services, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.3 0.7  
Midstream services, Crude services, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers $ 0.0 0.0  
Midstream services, Other services, related party      
Segment Reporting      
Revenue from contracts with customers   0.2  
Midstream services, Other services, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Other services, related party | Permian | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Other services, related party | North Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.0  
Midstream services, Other services, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   0.2  
Midstream services, Other services, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers   $ 0.0  
[1] Includes related party cost of sales of $8.1 million and $34.1 million for the three months ended March 31, 2019 and 2018, respectively