Segment Information - Financial Information and Assets (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting
Revenue from contracts with customers		$ 1,444.9	$ 767.3	$ 2,776.7	$ 1,904.2
Cost of sales, exclusive of operating expenses and depreciation and amortization	[1],[2]	(1,055.1)	(397.7)	(1,989.8)	(1,153.0)
Realized gain (loss) on derivatives				(34.2)	(6.0)
Change in fair value of derivatives		(23.8)	(18.8)	(31.7)	(5.8)
Adjusted gross margin		351.6	347.2	665.3	748.0
Operating expenses		96.8	88.1	153.1	188.8
Segment profit		254.8	259.1	512.2	559.2
Depreciation and amortization		(151.9)	(158.2)	(302.9)	(321.0)
Impairments		0.0	(1.5)	0.0	(354.5)
Gain (loss) on disposition of assets		0.3	(5.2)	0.3	(4.6)
General and administrative		(26.1)	(23.5)	(52.1)	(53.9)
Interest expense, net of interest income		(60.0)	(55.2)	(120.0)	(110.8)
Gain on extinguishment of debt		0.0	26.7	0.0	32.0
Loss from unconsolidated affiliates		(1.3)	(0.7)	(7.6)	1.0
Other income		0.2	0.0	0.1	0.0
Income (loss) before non-controlling interest and income taxes		16.0	41.5	30.0	(252.6)
Capital expenditures		48.6	69.2	69.4	184.0
Related parties amount in cost of sales		3.6	1.3	6.8	4.2
Other depreciation and amortization		150.1	156.1	299.1	316.9
Commodity swaps
Segment Reporting
Realized gain (loss) on derivatives		(14.4)	(3.6)	(89.9)	2.6
Permian
Segment Reporting
Revenue from contracts with customers		485.8	204.6	904.6	576.3
Cost of sales, exclusive of operating expenses and depreciation and amortization		(402.3)	(138.4)	(727.9)	(452.3)
Change in fair value of derivatives		(7.9)	(8.0)	(13.2)	1.4
Adjusted gross margin		71.4	57.1	102.4	125.2
Operating expenses		27.4	22.7	15.6	48.2
Segment profit		44.0	34.4	86.8	77.0
Depreciation and amortization		(34.6)	(31.0)	(68.1)	(60.2)
Impairments			0.0		(184.6)
Gain (loss) on disposition of assets		0.0	(5.3)	0.1	(4.9)
General and administrative		0.0	0.0	0.0	0.0
Interest expense, net of interest income		0.0	0.0	0.0	0.0
Gain on extinguishment of debt			0.0		0.0
Loss from unconsolidated affiliates		0.0	0.0	0.0	0.0
Other income		0.0		0.0
Income (loss) before non-controlling interest and income taxes		9.4	(1.9)	18.8	(172.7)
Capital expenditures		39.5	46.9	52.8	132.9
Permian | Commodity swaps
Segment Reporting
Realized gain (loss) on derivatives		(4.2)	(1.1)	(61.1)	(0.2)
Louisiana
Segment Reporting
Revenue from contracts with customers		953.7	409.7	1,816.6	973.2
Cost of sales, exclusive of operating expenses and depreciation and amortization		(838.9)	(312.5)	(1,579.3)	(772.2)
Change in fair value of derivatives		(9.4)	(4.1)	(9.8)	(5.1)
Adjusted gross margin		99.0	91.3	210.4	198.4
Operating expenses		31.7	27.5	60.9	59.3
Segment profit		67.3	63.8	149.5	139.1
Depreciation and amortization		(36.1)	(34.6)	(72.2)	(72.4)
Impairments			(1.5)		(169.9)
Gain (loss) on disposition of assets		0.2	0.1	0.1	0.1
General and administrative		0.0	0.0	0.0	0.0
Interest expense, net of interest income		0.0	0.0	0.0	0.0
Gain on extinguishment of debt			0.0		0.0
Loss from unconsolidated affiliates		0.0	0.0	0.0	0.0
Other income		0.0		0.0
Income (loss) before non-controlling interest and income taxes		31.4	27.8	77.4	(103.1)
Capital expenditures		2.2	15.6	5.0	30.8
Louisiana | Commodity swaps
Segment Reporting
Realized gain (loss) on derivatives		(6.4)	(1.8)	(17.1)	2.5
Oklahoma
Segment Reporting
Revenue from contracts with customers		276.5	179.8	510.5	399.8
Cost of sales, exclusive of operating expenses and depreciation and amortization		(164.9)	(61.1)	(315.9)	(154.8)
Change in fair value of derivatives		(5.3)	(5.9)	(7.1)	(2.1)
Adjusted gross margin		103.4	112.0	178.6	242.9
Operating expenses		17.8	19.4	37.5	42.3
Segment profit		85.6	92.6	141.1	200.6
Depreciation and amortization		(50.6)	(54.1)	(101.3)	(110.7)
Impairments			0.0		0.0
Gain (loss) on disposition of assets		0.0	(0.1)	0.0	0.1
General and administrative		0.0	0.0	0.0	0.0
Interest expense, net of interest income		0.0	0.0	0.0	0.0
Gain on extinguishment of debt			0.0		0.0
Loss from unconsolidated affiliates		0.0	0.0	0.0	0.0
Other income		0.0		0.0
Income (loss) before non-controlling interest and income taxes		35.0	38.4	39.8	90.0
Capital expenditures		4.9	3.0	6.8	11.5
Oklahoma | Commodity swaps
Segment Reporting
Realized gain (loss) on derivatives		(2.9)	(0.8)	(8.9)	0.0
North Texas
Segment Reporting
Revenue from contracts with customers		188.2	106.4	390.7	227.1
Cost of sales, exclusive of operating expenses and depreciation and amortization		(108.3)	(18.9)	(212.4)	(45.9)
Change in fair value of derivatives		(1.2)	(0.8)	(1.6)	0.0
Adjusted gross margin		77.8	86.8	173.9	181.5
Operating expenses		19.9	18.5	39.1	39.0
Segment profit		57.9	68.3	134.8	142.5
Depreciation and amortization		(28.8)	(36.4)	(57.5)	(73.6)
Impairments			0.0		0.0
Gain (loss) on disposition of assets		0.1	0.1	0.1	0.1
General and administrative		0.0	0.0	0.0	0.0
Interest expense, net of interest income		0.0	0.0	0.0	0.0
Gain on extinguishment of debt			0.0		0.0
Loss from unconsolidated affiliates		0.0	0.0	0.0	0.0
Other income		0.0		0.0
Income (loss) before non-controlling interest and income taxes		29.2	32.0	77.4	69.0
Capital expenditures		1.9	3.0	4.3	7.7
North Texas | Commodity swaps
Segment Reporting
Realized gain (loss) on derivatives		(0.9)	0.1	(2.8)	0.3
Corporate
Segment Reporting
Revenue from contracts with customers		(459.3)	(133.2)	(845.7)	(272.2)
Cost of sales, exclusive of operating expenses and depreciation and amortization		459.3	133.2	845.7	272.2
Change in fair value of derivatives		0.0	0.0	0.0	0.0
Adjusted gross margin		0.0	0.0	0.0	0.0
Operating expenses		0.0	0.0	0.0	0.0
Segment profit		0.0	0.0	0.0	0.0
Depreciation and amortization		(1.8)	(2.1)	(3.8)	(4.1)
Impairments			0.0		0.0
Gain (loss) on disposition of assets		0.0	0.0	0.0	0.0
General and administrative		(26.1)	(23.5)	(52.1)	(53.9)
Interest expense, net of interest income		(60.0)	(55.2)	(120.0)	(110.8)
Gain on extinguishment of debt			26.7		32.0
Loss from unconsolidated affiliates		(1.3)	(0.7)	(7.6)	1.0
Other income		0.2		0.1
Income (loss) before non-controlling interest and income taxes		(89.0)	(54.8)	(183.4)	(135.8)
Capital expenditures		0.1	0.7	0.5	1.1
Corporate | Commodity swaps
Segment Reporting
Realized gain (loss) on derivatives		0.0	0.0	0.0	0.0
Product sales
Segment Reporting
Revenue from contracts with customers		1,235.6	532.6	2,358.5	1,425.5
Product sales | Permian
Segment Reporting
Revenue from contracts with customers		268.3	119.3	500.6	419.6
Product sales | Louisiana
Segment Reporting
Revenue from contracts with customers		879.5	364.4	1,667.8	878.1
Product sales | Oklahoma
Segment Reporting
Revenue from contracts with customers		61.7	34.3	111.8	92.8
Product sales | North Texas
Segment Reporting
Revenue from contracts with customers		26.1	14.6	78.3	35.0
Product sales | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales, Natural gas sales
Segment Reporting
Revenue from contracts with customers		291.2	144.4	624.3	302.3
Product sales, Natural gas sales | Permian
Segment Reporting
Revenue from contracts with customers		97.4	32.4	222.4	47.5
Product sales, Natural gas sales | Louisiana
Segment Reporting
Revenue from contracts with customers		122.0	68.6	243.2	150.2
Product sales, Natural gas sales | Oklahoma
Segment Reporting
Revenue from contracts with customers		45.6	28.8	81.5	69.9
Product sales, Natural gas sales | North Texas
Segment Reporting
Revenue from contracts with customers		26.2	14.6	77.2	34.7
Product sales, Natural gas sales | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales, NGL sales
Segment Reporting
Revenue from contracts with customers		707.4	281.3	1,335.2	656.7
Product sales, NGL sales | Permian
Segment Reporting
Revenue from contracts with customers		0.5	(0.1)	0.5	0.1
Product sales, NGL sales | Louisiana
Segment Reporting
Revenue from contracts with customers		706.6	280.9	1,332.6	654.6
Product sales, NGL sales | Oklahoma
Segment Reporting
Revenue from contracts with customers		0.4	0.5	1.0	1.7
Product sales, NGL sales | North Texas
Segment Reporting
Revenue from contracts with customers		(0.1)	0.0	1.1	0.3
Product sales, NGL sales | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales, Crude oil and condensate sales
Segment Reporting
Revenue from contracts with customers		237.0	106.9	399.0	466.5
Product sales, Crude oil and condensate sales | Permian
Segment Reporting
Revenue from contracts with customers		170.4	87.0	277.7	372.0
Product sales, Crude oil and condensate sales | Louisiana
Segment Reporting
Revenue from contracts with customers		50.9	14.9	92.0	73.3
Product sales, Crude oil and condensate sales | Oklahoma
Segment Reporting
Revenue from contracts with customers		15.7	5.0	29.3	21.2
Product sales, Crude oil and condensate sales | North Texas
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales, Crude oil and condensate sales | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales—related parties
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales—related parties | Permian
Segment Reporting
Revenue from contracts with customers		195.5	59.5	360.4	105.5
Product sales—related parties | Louisiana
Segment Reporting
Revenue from contracts with customers		30.2	3.2	53.8	10.0
Product sales—related parties | Oklahoma
Segment Reporting
Revenue from contracts with customers		137.2	56.1	250.3	123.5
Product sales—related parties | North Texas
Segment Reporting
Revenue from contracts with customers		96.4	14.3	178.8	33.0
Product sales—related parties | Corporate
Segment Reporting
Revenue from contracts with customers		(459.3)	(133.1)	(843.3)	(272.0)
Product sales, NGL sales, related party
Segment Reporting
Revenue from contracts with customers		0.0	0.1	0.0	0.0
Product sales, NGL sales, related party | Permian
Segment Reporting
Revenue from contracts with customers		195.5	59.5	360.4	105.4
Product sales, NGL sales, related party | Louisiana
Segment Reporting
Revenue from contracts with customers		30.2	3.2	53.8	10.0
Product sales, NGL sales, related party | Oklahoma
Segment Reporting
Revenue from contracts with customers		137.1	56.0	250.2	123.6
Product sales, NGL sales, related party | North Texas
Segment Reporting
Revenue from contracts with customers		94.3	13.9	175.2	31.1
Product sales, NGL sales, related party | Corporate
Segment Reporting
Revenue from contracts with customers		(457.1)	(132.5)	(839.6)	(270.1)
Product sales, Crude oil and condensate sales, related party
Segment Reporting
Revenue from contracts with customers		0.0	(0.1)	0.0	0.0
Product sales, Crude oil and condensate sales, related party | Permian
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.1
Product sales, Crude oil and condensate sales, related party | Louisiana
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Product sales, Crude oil and condensate sales, related party | Oklahoma
Segment Reporting
Revenue from contracts with customers		0.1	0.1	0.1	(0.1)
Product sales, Crude oil and condensate sales, related party | North Texas
Segment Reporting
Revenue from contracts with customers		2.1	0.4	3.6	1.9
Product sales, Crude oil and condensate sales, related party | Corporate
Segment Reporting
Revenue from contracts with customers		(2.2)	(0.6)	(3.7)	(1.9)
Midstream services
Segment Reporting
Revenue from contracts with customers		209.3	234.7	418.2	478.7
Midstream services | Permian
Segment Reporting
Revenue from contracts with customers		22.0	25.8	43.6	51.2
Midstream services | Louisiana
Segment Reporting
Revenue from contracts with customers		44.0	42.1	92.7	85.1
Midstream services | Oklahoma
Segment Reporting
Revenue from contracts with customers		77.6	89.3	148.3	183.3
Midstream services | North Texas
Segment Reporting
Revenue from contracts with customers		65.7	77.5	133.6	159.1
Midstream services | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, Gathering and transportation
Segment Reporting
Revenue from contracts with customers		112.3	121.3	229.5	251.5
Midstream services, Gathering and transportation | Permian
Segment Reporting
Revenue from contracts with customers		11.8	13.1	21.5	29.4
Midstream services, Gathering and transportation | Louisiana
Segment Reporting
Revenue from contracts with customers		16.4	11.5	32.2	23.2
Midstream services, Gathering and transportation | Oklahoma
Segment Reporting
Revenue from contracts with customers		45.9	52.5	97.2	108.8
Midstream services, Gathering and transportation | North Texas
Segment Reporting
Revenue from contracts with customers		38.2	44.2	78.6	90.1
Midstream services, Gathering and transportation | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, Processing
Segment Reporting
Revenue from contracts with customers		61.6	73.2	113.3	146.9
Midstream services, Processing | Permian
Segment Reporting
Revenue from contracts with customers		6.0	7.5	14.2	11.8
Midstream services, Processing | Louisiana
Segment Reporting
Revenue from contracts with customers		0.5	0.6	1.0	1.3
Midstream services, Processing | Oklahoma
Segment Reporting
Revenue from contracts with customers		28.1	32.1	44.0	65.4
Midstream services, Processing | North Texas
Segment Reporting
Revenue from contracts with customers		27.0	33.0	54.1	68.4
Midstream services, Processing | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, NGL services
Segment Reporting
Revenue from contracts with customers		17.2	18.7	39.3	38.3
Midstream services, NGL services | Permian
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, NGL services | Louisiana
Segment Reporting
Revenue from contracts with customers		17.1	18.6	39.1	38.2
Midstream services, NGL services | Oklahoma
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, NGL services | North Texas
Segment Reporting
Revenue from contracts with customers		0.1	0.1	0.2	0.1
Midstream services, NGL services | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, Crude services
Segment Reporting
Revenue from contracts with customers		17.2	20.6	34.1	39.7
Midstream services, Crude services | Permian
Segment Reporting
Revenue from contracts with customers		4.0	5.0	7.5	9.2
Midstream services, Crude services | Louisiana
Segment Reporting
Revenue from contracts with customers		9.6	11.0	19.5	21.6
Midstream services, Crude services | Oklahoma
Segment Reporting
Revenue from contracts with customers		3.4	4.6	6.7	8.9
Midstream services, Crude services | North Texas
Segment Reporting
Revenue from contracts with customers		0.2	0.0	0.4	0.0
Midstream services, Crude services | Corporate
Segment Reporting
Revenue from contracts with customers		0.0	0.0	0.0	0.0
Midstream services, Other services
Segment Reporting
Revenue from contracts with customers		1.0	0.9	2.0	2.3
Midstream services, Other services | Permian
Segment Reporting
Revenue from contracts with customers		0.2	0.2	0.4	0.8
Midstream services, Other services | Louisiana
Segment Reporting
Revenue from contracts with customers		0.4	0.4	0.9	0.8
Midstream services, Other services | Oklahoma
Segment Reporting
Revenue from contracts with customers		0.2	0.1	0.4	0.2
Midstream services, Other services | North Texas
Segment Reporting
Revenue from contracts with customers		0.2	0.2	0.3	0.5
Midstream services, Other services | Corporate
Segment Reporting
Revenue from contracts with customers		$ 0.0	0.0	0.0	0.0
Midstream services—related parties
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services—related parties | Permian
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services—related parties | Louisiana
Segment Reporting
Revenue from contracts with customers			0.0	2.3	0.0
Midstream services—related parties | Oklahoma
Segment Reporting
Revenue from contracts with customers			0.1	0.1	0.2
Midstream services—related parties | North Texas
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services—related parties | Corporate
Segment Reporting
Revenue from contracts with customers			(0.1)	(2.4)	(0.2)
Midstream services, Crude services, related party
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services, Crude services, related party | Permian
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services, Crude services, related party | Louisiana
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services, Crude services, related party | Oklahoma
Segment Reporting
Revenue from contracts with customers			0.1	0.1	0.2
Midstream services, Crude services, related party | North Texas
Segment Reporting
Revenue from contracts with customers			0.0	0.0	0.0
Midstream services, Crude services, related party | Corporate
Segment Reporting
Revenue from contracts with customers			$ (0.1)	(0.1)	$ (0.2)
Midstream services, Other services, related party
Segment Reporting
Revenue from contracts with customers				0.0
Midstream services, Other services, related party | Permian
Segment Reporting
Revenue from contracts with customers				0.0
Midstream services, Other services, related party | Louisiana
Segment Reporting
Revenue from contracts with customers				2.3
Midstream services, Other services, related party | Oklahoma
Segment Reporting
Revenue from contracts with customers				0.0
Midstream services, Other services, related party | North Texas
Segment Reporting
Revenue from contracts with customers				0.0
Midstream services, Other services, related party | Corporate
Segment Reporting
Revenue from contracts with customers				$ (2.3)

[1] Includes related party cost of sales of $3.6 million and $1.3 million for the three months ended June 30, 2021 and 2020, respectively, and excludes all operating expenses as well as depreciation and amortization related to our operating segments of $150.1 million and $156.1 million for the three months ended June 30, 2021 and 2020, respectively.

[2] Includes related party cost of sales of $6.8 million and $4.2 million for the six months ended June 30, 2021 and 2020, respectively, and excludes all operating expenses as well as depreciation and amortization related to our operating segments of $299.1 million and $316.9 million for the six months ended June 30, 2021 and 2020, respectively.