Segment Information - Financial Information and Assets (Details) - USD ($) $ in Millions		3 Months Ended												12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue from contracts with customers														$ 3,915.8	$ 6,038.5	$ 7,693.8
Cost of sales, exclusive of operating expenses and depreciation and amortization (1)	[1]													(2,388.5)	(4,392.5)	(6,008.0)
Gain (loss) on derivative activity														(22.0)	14.4	5.2
Adjusted gross margin														1,505.3	1,660.4	1,691.0
Operating expenses														(373.8)	(467.1)	(453.4)
Segment profit														1,131.5	1,193.3	1,237.6
Depreciation and amortization														(638.6)	(617.0)	(577.3)
Impairments		$ (8.3)	$ 0.0	$ (1.5)	$ (353.0)	$ (947.0)	$ 0.0	$ 0.0	$ (186.5)	$ (341.2)	$ (24.6)	$ 0.0	$ 0.0	(362.8)	(1,133.5)	(365.8)
Capital expenditures														262.6	748.4	849.9
(Gain) loss on disposition of assets														(8.8)	1.9	(0.4)
General and administrative														(103.3)	(152.6)	(140.3)
Loss on secured term loan receivable														0.0	(52.9)	0.0
Interest expense, net of interest income														(223.3)	(216.0)	(182.3)
Gain on extinguishment of debt														32.0	0.0	0.0
Income (loss) from unconsolidated affiliates														0.6	(16.8)	13.3
Other income														0.3	0.9	0.6
Loss before non-controlling interest and income taxes														(172.4)	(992.7)	(14.6)
Related parties amount in cost of sales														8.7	21.7
Other depreciation and amortization														631.3	608.6	568.6
Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														1,106.5	2,542.3	3,030.3
Cost of sales, exclusive of operating expenses and depreciation and amortization (1)														(842.2)	(2,283.9)	(2,808.3)
Gain (loss) on derivative activity														0.0	0.0	0.0
Adjusted gross margin														264.3	258.4	222.0
Operating expenses														(94.2)	(112.9)	(96.1)
Segment profit														170.1	145.5	125.9
Depreciation and amortization														(125.2)	(119.8)	(111.0)
Impairments														(184.6)	(3.5)	(138.5)
Capital expenditures														181.1	364.5	271.7
(Gain) loss on disposition of assets														(11.2)	(0.3)	0.0
General and administrative														0.0	0.0	0.0
Loss on secured term loan receivable															0.0
Interest expense, net of interest income														0.0	0.0	0.0
Gain on extinguishment of debt														0.0
Income (loss) from unconsolidated affiliates														0.0	0.0	0.0
Other income														0.0	0.0	0.0
Loss before non-controlling interest and income taxes														(150.9)	21.9	(123.6)
Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														2,205.1	2,622.8	3,788.4
Cost of sales, exclusive of operating expenses and depreciation and amortization (1)														(1,787.0)	(2,181.6)	(3,365.7)
Gain (loss) on derivative activity														0.0	0.0	0.0
Adjusted gross margin														418.1	441.2	422.7
Operating expenses														(120.0)	(147.3)	(154.3)
Segment profit														298.1	293.9	268.4
Depreciation and amortization														(145.8)	(154.1)	(150.9)
Impairments														(170.0)	(188.7)	(24.6)
Capital expenditures														44.6	99.9	54.4
(Gain) loss on disposition of assets														0.1	2.6	(0.1)
General and administrative														0.0	0.0	0.0
Loss on secured term loan receivable															0.0
Interest expense, net of interest income														0.0	0.0	0.0
Gain on extinguishment of debt														0.0
Income (loss) from unconsolidated affiliates														0.0	0.0	0.0
Other income														0.0	0.0	0.0
Loss before non-controlling interest and income taxes														(17.6)	(46.3)	92.8
Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														862.0	1,181.1	1,299.8
Cost of sales, exclusive of operating expenses and depreciation and amortization (1)														(365.5)	(627.0)	(743.6)
Gain (loss) on derivative activity														0.0	0.0	0.0
Adjusted gross margin														496.5	554.1	556.2
Operating expenses														(82.2)	(104.0)	(90.3)
Segment profit														414.3	450.1	465.9
Depreciation and amortization														(216.9)	(194.9)	(178.8)
Impairments														(0.7)	(813.5)	0.0
Capital expenditures														17.9	238.1	493.8
(Gain) loss on disposition of assets														0.3	0.1	(0.8)
General and administrative														0.0	0.0	0.0
Loss on secured term loan receivable															0.0
Interest expense, net of interest income														0.0	0.0	0.0
Gain on extinguishment of debt														0.0
Income (loss) from unconsolidated affiliates														0.0	0.0	0.0
Other income														0.0	0.0	0.0
Loss before non-controlling interest and income taxes														197.0	(558.2)	286.3
North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														502.2	601.1	684.1
Cost of sales, exclusive of operating expenses and depreciation and amortization (1)														(153.8)	(208.8)	(199.2)
Gain (loss) on derivative activity														0.0	0.0	0.0
Adjusted gross margin														348.4	392.3	484.9
Operating expenses														(77.4)	(102.9)	(112.7)
Segment profit														271.0	289.4	372.2
Depreciation and amortization														(143.4)	(139.8)	(127.9)
Impairments														0.0	(127.8)	(202.7)
Capital expenditures														16.9	39.0	24.7
(Gain) loss on disposition of assets														2.0	(0.5)	0.4
General and administrative														0.0	0.0	0.0
Loss on secured term loan receivable															0.0
Interest expense, net of interest income														0.0	0.0	0.0
Gain on extinguishment of debt														0.0
Income (loss) from unconsolidated affiliates														0.0	0.0	0.0
Other income														0.0	0.0	0.0
Loss before non-controlling interest and income taxes														129.6	21.3	42.0
Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														(760.0)	(908.8)	(1,108.8)
Cost of sales, exclusive of operating expenses and depreciation and amortization (1)														760.0	908.8	1,108.8
Gain (loss) on derivative activity														(22.0)	14.4	5.2
Adjusted gross margin														(22.0)	14.4	5.2
Operating expenses														0.0	0.0	0.0
Segment profit														(22.0)	14.4	5.2
Depreciation and amortization														(7.3)	(8.4)	(8.7)
Impairments														(7.5)	0.0	0.0
Capital expenditures														2.1	6.9	5.3
(Gain) loss on disposition of assets														0.0	0.0	0.1
General and administrative														(103.3)	(152.6)	(140.3)
Loss on secured term loan receivable															(52.9)
Interest expense, net of interest income														(223.3)	(216.0)	(182.3)
Gain on extinguishment of debt														32.0
Income (loss) from unconsolidated affiliates														0.6	(16.8)	13.3
Other income														0.3	0.9	0.6
Loss before non-controlling interest and income taxes														(330.5)	(431.4)	(312.1)
Product sales
Segment Reporting Information [Line Items]
Revenue from contracts with customers														2,977.5	5,030.1	6,512.3
Product sales | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														708.4	2,070.2	2,496.9
Product sales | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														2,002.6	2,434.1	3,544.5
Product sales | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														196.2	365.6	300.8
Product sales | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														70.3	160.2	170.1
Product sales | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Natural gas sales
Segment Reporting Information [Line Items]
Revenue from contracts with customers														704.0	876.6	1,013.7
Natural gas sales | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														150.1	94.3	152.3
Natural gas sales | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														330.5	416.6	531.1
Natural gas sales | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														153.1	236.4	189.7
Natural gas sales | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														70.3	129.3	140.6
Natural gas sales | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
NGL sales
Segment Reporting Information [Line Items]
Revenue from contracts with customers														1,548.4	1,777.0	2,841.0
NGL sales | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.2	0.9	0.5
NGL sales | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														1,545.4	1,725.6	2,786.3
NGL sales | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														2.8	19.6	25.2
NGL sales | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	30.9	29.0
NGL sales | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Crude oil and condensate sales
Segment Reporting Information [Line Items]
Revenue from contracts with customers														725.1	2,376.5	2,657.6
Crude oil and condensate sales | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														558.1	1,975.0	2,344.1
Crude oil and condensate sales | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														126.7	291.9	227.1
Crude oil and condensate sales | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														40.3	109.6	85.9
Crude oil and condensate sales | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.5
Crude oil and condensate sales | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Product sales—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	41.0
Product sales—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														313.2	361.6	453.8
Product sales—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														31.4	27.4	47.9
Product sales—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														296.3	421.1	593.6
Product sales—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														118.8	100.3	51.2
Product sales—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														(759.7)	(910.4)	(1,105.5)
Natural gas sales—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	2.5
Natural gas sales—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.4	(0.3)
Natural gas sales—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	0.3
Natural gas sales—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	2.5
Natural gas sales—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	0.0
Natural gas sales—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers															(0.4)	0.0
NGL sales—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	37.4
NGL sales—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														312.6	347.7	454.1
NGL sales—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														31.4	25.7	47.4
NGL sales—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														296.4	421.1	590.8
NGL sales—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														115.2	94.8	49.4
NGL sales—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														(755.6)	(889.3)	(1,104.3)
Crude oil and condensate sales—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	1.1
Crude oil and condensate sales—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.6	13.5	0.0
Crude oil and condensate sales—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	1.7	0.2
Crude oil and condensate sales—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														(0.1)	0.0	0.3
Crude oil and condensate sales—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														3.6	5.5	1.8
Crude oil and condensate sales—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														(4.1)	(20.7)	(1.2)
Midstream services
Segment Reporting Information [Line Items]
Revenue from contracts with customers														938.3	1,008.4	763.3
Midstream services | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														84.9	110.5	64.7
Midstream services | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														171.1	164.7	192.7
Midstream services | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														369.2	392.6	274.8
Midstream services | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														313.1	340.6	231.1
Midstream services | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Gathering and transportation
Segment Reporting Information [Line Items]
Revenue from contracts with customers														497.2	538.0	386.3
Gathering and transportation | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														42.8	48.8	28.0
Gathering and transportation | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														46.5	58.3	68.8
Gathering and transportation | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														228.7	234.5	143.2
Gathering and transportation | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														179.2	196.4	146.3
Gathering and transportation | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Processing
Segment Reporting Information [Line Items]
Revenue from contracts with customers														282.3	314.9	239.7
Processing | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														24.1	30.5	23.8
Processing | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														2.0	3.2	3.3
Processing | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														123.6	138.2	128.7
Processing | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														132.6	143.0	83.9
Processing | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
NGL services
Segment Reporting Information [Line Items]
Revenue from contracts with customers														76.0	50.7	59.6
NGL services | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
NGL services | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														75.8	50.6	59.6
NGL services | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
NGL services | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.2	0.1	0.0
NGL services | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Crude services
Segment Reporting Information [Line Items]
Revenue from contracts with customers														78.7	90.9	67.1
Crude services | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														16.8	19.2	4.2
Crude services | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														45.2	51.9	60.1
Crude services | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														16.5	19.8	2.8
Crude services | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.2	0.0	0.0
Crude services | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Other services
Segment Reporting Information [Line Items]
Revenue from contracts with customers														4.1	13.9	10.6
Other services | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														1.2	12.0	8.7
Other services | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														1.6	0.7	0.9
Other services | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.4	0.1	0.1
Other services | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.9	1.1	0.9
Other services | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Midstream services—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	377.2
Midstream services—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	14.9
Midstream services—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	(3.4)	3.3
Midstream services—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.3	1.8	130.6
Midstream services—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	231.7
Midstream services—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														(0.3)	1.6	(3.3)
Gathering and transportation—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers																203.3
Gathering and transportation—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Gathering and transportation—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Gathering and transportation—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers																80.6
Gathering and transportation—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers																122.7
Gathering and transportation—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Processing—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers																157.0
Processing—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Processing—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Processing—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers																48.5
Processing—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers																108.5
Processing—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
NGL services—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	0.0
NGL services—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	0.0
NGL services—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers															(3.4)	3.3
NGL services—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	0.0
NGL services—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers															0.0	0.0
NGL services—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers															3.4	(3.3)
Crude services—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	16.4
Crude services—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	14.9
Crude services—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Crude services—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.3	1.8	1.5
Crude services—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers														0.0	0.0	0.0
Crude services—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers														$ (0.3)	$ (1.8)	0.0
Other services—related parties
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.5
Other services—related parties | Permian
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Other services—related parties | Louisiana
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Other services—related parties | Oklahoma
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.0
Other services—related parties | North Texas
Segment Reporting Information [Line Items]
Revenue from contracts with customers																0.5
Other services—related parties | Corporate
Segment Reporting Information [Line Items]
Revenue from contracts with customers																$ 0.0

[1] Includes related party cost of sales of $8.7 million, $21.7 million, and $114.1 million for the years ended December 31, 2020, 2019, and 2018, respectively, and excludes all operating expenses as well as depreciation and amortization related to our operating segments of $631.3 million, $608.6 million, and $568.6 million for the years ended December 31, 2020, 2019, and 2018, respectively.