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Segment Information - Financial Information and Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting      
Revenue from contracts with customers $ 1,761.2    
Cost of sales [1] (1,381.5) $ (1,002.3)  
Operating expenses (109.2) (104.1)  
Gain on derivative activity 0.5 2.8  
Segment profit 271.0 215.5  
Depreciation and amortization (138.1) (128.3)  
Impairments 0.0 (7.0)  
Goodwill 1,542.2 1,542.2 $ 1,542.2
Capital expenditures 181.2 248.1  
Total identifiable assets 10,615.1   10,537.8
Corporate      
Segment Reporting      
Revenue from contracts with customers (229.0)    
Cost of sales 229.0 167.0  
Operating expenses 0.0 0.0  
Gain on derivative activity 0.5 2.8  
Segment profit 0.5 2.8  
Depreciation and amortization (1.9) (2.4)  
Impairments   0.0  
Goodwill 1,119.9 1,119.9  
Capital expenditures 1.3 9.0  
Total identifiable assets 1,252.1   1,268.3
Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 310.1    
Cost of sales (161.5) (179.2)  
Operating expenses (44.2) (43.9)  
Gain on derivative activity 0.0 0.0  
Segment profit 104.4 101.4  
Depreciation and amortization (52.5) (49.8)  
Impairments   0.0  
Goodwill 232.0 232.0  
Capital expenditures 65.3 28.3  
Total identifiable assets 3,122.2   3,094.8
Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 774.1    
Cost of sales (686.7) (564.7)  
Operating expenses (25.6) (25.4)  
Gain on derivative activity   0.0  
Segment profit 61.8 46.7  
Depreciation and amortization (29.2) (28.1)  
Impairments   0.0  
Goodwill 0.0 0.0  
Capital expenditures 6.8 32.7  
Total identifiable assets 2,366.8   2,408.5
Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 255.1    
Cost of sales (139.0) (88.7)  
Operating expenses (20.7) (14.1)  
Gain on derivative activity 0.0 0.0  
Segment profit 95.4 53.4  
Depreciation and amortization (42.1) (36.5)  
Impairments   0.0  
Goodwill 190.3 190.3  
Capital expenditures 98.5 140.7  
Total identifiable assets 2,890.2   2,836.7
Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 650.9    
Cost of sales (623.3) (336.7)  
Operating expenses (18.7) (20.7)  
Gain on derivative activity 0.0 0.0  
Segment profit 8.9 11.2  
Depreciation and amortization (12.4) (11.5)  
Impairments   (7.0)  
Goodwill 0.0 0.0  
Capital expenditures 9.3 37.4  
Total identifiable assets 983.8   $ 929.5
Product sales      
Segment Reporting      
Revenue from contracts with customers 1,499.2 990.0  
Product sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Product sales | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 83.0 85.1  
Product sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 733.4 544.5  
Product sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 50.0 14.5  
Product sales | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 632.8 345.9  
Product sales, Natural gas sales      
Segment Reporting      
Revenue from contracts with customers 256.1    
Product sales, Natural gas sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Natural gas sales | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 83.0    
Product sales, Natural gas sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 125.0    
Product sales, Natural gas sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 48.1    
Product sales, Natural gas sales | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, NGL sales      
Segment Reporting      
Revenue from contracts with customers 610.8    
Product sales, NGL sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, NGL sales | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, NGL sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 608.4    
Product sales, NGL sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 1.9    
Product sales, NGL sales | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.5    
Product sales, Crude oil and condensate sales      
Segment Reporting      
Revenue from contracts with customers 632.3    
Product sales, Crude oil and condensate sales | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Crude oil and condensate sales | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Crude oil and condensate sales | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Crude oil and condensate sales | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Crude oil and condensate sales | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 632.3    
Product sales—related parties      
Segment Reporting      
Revenue from contracts with customers 3.6 42.7  
Product sales—related parties | Corporate      
Segment Reporting      
Revenue from contracts with customers (229.0) (139.2)  
Product sales—related parties | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 103.9 106.5  
Product sales—related parties | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 5.7 10.2  
Product sales—related parties | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 122.9 64.4  
Product sales—related parties | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.1 0.8  
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 | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Natural gas sales, related party | Louisiana | 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 | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, NGL sales, related party      
Segment Reporting      
Revenue from contracts with customers 2.4    
Product sales, NGL sales, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers (196.3)    
Product sales, NGL sales, related party | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 93.0    
Product sales, NGL sales, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 5.6    
Product sales, NGL sales, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 100.1    
Product sales, NGL sales, related party | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Product sales, Crude oil and condensate sales, related party      
Segment Reporting      
Revenue from contracts with customers 0.7    
Product sales, Crude oil and condensate sales, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers (32.7)    
Product sales, Crude oil and condensate sales, related party | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 10.9    
Product sales, Crude oil and condensate sales, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.1    
Product sales, Crude oil and condensate sales, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 22.3    
Product sales, Crude oil and condensate sales, related party | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.1    
Midstream services      
Segment Reporting      
Revenue from contracts with customers 92.2 127.4  
Midstream services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 0.0  
Midstream services | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 18.8 27.8  
Midstream services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 35.0 53.1  
Midstream services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 24.7 27.9  
Midstream services | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 13.7 18.6  
Midstream services, Gathering and transportation      
Segment Reporting      
Revenue from contracts with customers 47.2    
Midstream services, Gathering and transportation | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Gathering and transportation | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 13.2    
Midstream services, Gathering and transportation | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 17.6    
Midstream services, Gathering and transportation | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 15.6    
Midstream services, Gathering and transportation | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.8    
Midstream services, Processing      
Segment Reporting      
Revenue from contracts with customers 13.4    
Midstream services, Processing | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Processing | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 3.8    
Midstream services, Processing | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.6    
Midstream services, Processing | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 9.0    
Midstream services, Processing | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, NGL services      
Segment Reporting      
Revenue from contracts with customers 16.6    
Midstream services, NGL services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, NGL services | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, NGL services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 16.6    
Midstream services, NGL services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, NGL services | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services      
Segment Reporting      
Revenue from contracts with customers 12.9    
Midstream services, Crude services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.1    
Midstream services, Crude services | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 12.8    
Midstream services, Other services      
Segment Reporting      
Revenue from contracts with customers 2.1    
Midstream services, Other services | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Other services | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 1.8    
Midstream services, Other services | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.2    
Midstream services, Other services | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Other services | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.1    
Midstream services—related parties      
Segment Reporting      
Revenue from contracts with customers 166.2 159.0  
Midstream services—related parties | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0 (27.8)  
Midstream services—related parties | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 104.4 105.1  
Midstream services—related parties | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0 29.0  
Midstream services—related parties | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 57.5 49.4  
Midstream services—related parties | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 4.3 $ 3.3  
Midstream services, Crude services, related party      
Segment Reporting      
Revenue from contracts with customers 5.0    
Midstream services, Crude services, related party | Corporate      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services, related party | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Crude services, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.7    
Midstream services, Crude services, related party | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 4.3    
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 | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 52.6    
Midstream services, Gathering and transportation, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
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 | Crude and Condensate | 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 | Texas | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 51.6    
Midstream services, Processing, related party | Louisiana | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Processing, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 22.1    
Midstream services, Processing, related party | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 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 | Texas | 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    
Midstream services, Other services, related party | Oklahoma | Operating Segments      
Segment Reporting      
Revenue from contracts with customers 0.0    
Midstream services, Other services, related party | Crude and Condensate | Operating Segments      
Segment Reporting      
Revenue from contracts with customers $ 0.0    
[1] Includes related party cost of sales of $34.1 million and $28.7 million for the three months ended March 31, 2018 and 2017, respectively.