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Segment Information - Financial Information and Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         $ 7,693.8    
Cost of sales [1]                         (6,008.0) $ (4,361.5) $ (3,015.5)
Operating expenses                         (453.4) (418.7) (398.5)
Gain (loss) on derivative activity                         5.2 (4.2) (11.1)
Segment profit (loss)                         1,237.6 959.4 838.4
Depreciation and amortization                         (577.3) (545.3) (503.9)
Impairments $ (341.2) $ (24.6) $ 0.0 $ 0.0 $ (8.3) $ (1.8) $ 0.0 $ (7.0) $ 0.0 $ 0.0 $ 0.0 $ (873.3) (365.8) (17.1) (873.3)
Goodwill 1,310.2       1,542.2       1,542.2       1,310.2 1,542.2 1,542.2
Capital expenditures                         849.9 768.1 676.1
Total assets 10,694.1       10,537.8       10,275.9       10,694.1 10,537.8 10,275.9
Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         (1,245.0)    
Cost of sales                         1,245.0 882.1 419.8
Operating expenses                         0.0 0.0 0.0
Gain (loss) on derivative activity                         5.2 (4.2) (11.1)
Segment profit (loss)                         5.2 (4.2) (11.1)
Depreciation and amortization                         (8.7) (9.9) (9.2)
Impairments                         0.0 0.0 (307.0)
Goodwill 1,119.9       1,119.9       1,119.9       1,119.9 1,119.9 1,119.9
Capital expenditures                         5.3 26.4 9.1
Total assets 1,345.1       1,268.3       1,422.7       1,345.1 1,268.3 1,422.7
Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         1,394.6    
Cost of sales                         (753.9) (772.3) (483.4)
Operating expenses                         (180.6) (172.7) (168.5)
Gain (loss) on derivative activity                         0.0 0.0 0.0
Segment profit (loss)                         460.1 420.9 416.4
Depreciation and amortization                         (216.2) (215.2) (196.9)
Impairments                         (232.0) 0.0 (473.1)
Goodwill 0.0       232.0       232.0       0.0 232.0 232.0
Capital expenditures                         249.4 145.4 217.9
Total assets 2,925.3       3,094.8       3,142.6       2,925.3 3,094.8 3,142.6
Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3,501.2    
Cost of sales                         (3,158.7) (2,618.1) (1,729.0)
Operating expenses                         (108.3) (101.3) (96.6)
Gain (loss) on derivative activity                         0.0 0.0 0.0
Segment profit (loss)                         234.2 212.2 175.9
Depreciation and amortization                         (122.7) (116.1) (114.8)
Impairments                         (24.6) (0.8) 0.0
Goodwill 0.0       0.0       0.0       0.0 0.0 0.0
Capital expenditures                         47.0 75.1 79.1
Total assets 2,347.9       2,408.5       2,349.3       2,347.9 2,408.5 2,349.3
Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         1,297.7    
Cost of sales                         (744.0) (522.9) (184.9)
Operating expenses                         (89.2) (64.6) (52.1)
Gain (loss) on derivative activity                         0.0 0.0 0.0
Segment profit (loss)                         464.5 287.3 200.0
Depreciation and amortization                         (178.1) (156.6) (140.6)
Impairments                         0.0 0.0 0.0
Goodwill 190.3       190.3       190.3       190.3 190.3 190.3
Capital expenditures                         412.5 442.1 295.7
Total assets 3,116.5       2,836.7       2,524.5       3,116.5 2,836.7 2,524.5
Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2,745.3    
Cost of sales                         (2,596.4) (1,330.3) (1,038.0)
Operating expenses                         (75.3) (80.1) (81.3)
Gain (loss) on derivative activity                         0.0 0.0 0.0
Segment profit (loss)                         73.6 43.2 57.2
Depreciation and amortization                         (51.6) (47.5) (42.4)
Impairments                         (109.2) (16.3) (93.2)
Goodwill 0.0       0.0       0.0       0.0 0.0 0.0
Capital expenditures                         135.7 79.1 74.3
Total assets $ 959.3       $ 929.5       $ 836.8       959.3 929.5 836.8
Product sales                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         6,512.3 4,358.4 3,008.9
Product sales | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0 0.0 0.0
Product sales | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         321.5 325.0 237.2
Product sales | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3,317.9 2,529.6 1,632.5
Product sales | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         215.6 128.8 48.5
Product sales | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2,657.3 1,375.0 1,090.7
Natural gas sales                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         1,013.7    
Natural gas sales | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Natural gas sales | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         292.9    
Natural gas sales | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         531.1    
Natural gas sales | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         189.7    
Natural gas sales | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL sales                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2,841.0    
NGL sales | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL sales | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         28.6    
NGL sales | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2,786.3    
NGL sales | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         25.2    
NGL sales | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.9    
Crude oil and condensate sales                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2,657.6    
Crude oil and condensate sales | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude oil and condensate sales | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude oil and condensate sales | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.5    
Crude oil and condensate sales | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.7    
Crude oil and condensate sales | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2,656.4    
Product sales—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         41.0 144.9 134.3
Product sales—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         (1,241.7) (750.6) (333.0)
Product sales—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         552.8 500.3 287.6
Product sales—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         47.7 45.0 57.8
Product sales—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         678.9 349.4 120.4
Product sales—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3.3 0.8 1.5
Product sales                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2.5    
Product sales | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Product sales | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Product sales | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Product sales | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         2.5    
Product sales | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL sales—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         37.4    
NGL sales—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         (1,104.3)    
NGL sales—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         503.5    
NGL sales—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         47.4    
NGL sales—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         590.8    
NGL sales—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude oil and condensate sales—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         1.1    
Crude oil and condensate sales—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         (137.4)    
Crude oil and condensate sales—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         49.3    
Crude oil and condensate sales—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.3    
Crude oil and condensate sales—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         85.6    
Crude oil and condensate sales—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3.3    
Midstream services                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         763.3 552.3 467.2
Midstream services | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0 0.0 0.0
Midstream services | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         288.5 116.3 104.2
Midstream services | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         132.3 220.6 215.4
Midstream services | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         272.7 155.0 82.2
Midstream services | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         69.8 60.4 65.4
Gathering and transportation                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         398.9    
Gathering and transportation | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Gathering and transportation | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         177.9    
Gathering and transportation | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         68.8    
Gathering and transportation | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         149.1    
Gathering and transportation | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3.1    
Processing                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         227.1    
Processing | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Processing | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         101.0    
Processing | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3.3    
Processing | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         122.8    
Processing | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         59.6    
NGL services | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         59.6    
NGL services | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         67.1    
Crude services | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.6    
Crude services | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         66.5    
Other services                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         10.6    
Other services | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Other services | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         9.6    
Other services | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.6    
Other services | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.2    
Other services | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.2    
Midstream services—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         377.2 688.2 653.1
Midstream services—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         (3.3) (131.5) (86.8)
Midstream services—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         231.8 424.3 439.3
Midstream services—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3.3 136.4 95.8
Midstream services—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         130.5 241.6 185.9
Midstream services—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         14.9 $ 17.4 $ 18.9
Gathering and transportation—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         203.3    
Gathering and transportation—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Gathering and transportation—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         122.7    
Gathering and transportation—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Gathering and transportation—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         80.6    
Gathering and transportation—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Processing—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         157.0    
Processing—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Processing—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         108.6    
Processing—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Processing—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         48.4    
Processing—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         (3.3)    
NGL services—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         3.3    
NGL services—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
NGL services—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         16.4    
Crude services—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Crude services—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         1.5    
Crude services—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         14.9    
Other services—related parties                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.5    
Other services—related parties | Corporate                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Other services—related parties | Texas | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.5    
Other services—related parties | Louisiana | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Other services—related parties | Oklahoma | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         0.0    
Other services—related parties | Crude and Condensate | Operating Segments                              
Segment Reporting Information [Line Items]                              
Revenue from contract with customer                         $ 0.0    
[1] Includes related party cost of sales of $114.1 million, $211.0 million, and $150.1 million for the years ended December 31, 2018, 2017, and 2016, respectively.