Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Gathering and processing	$ 825.5	$ 1,051.2	$ 1,831.5
Marketing, supply and logistics	1,144.3	857.5	1,339.4
Total product revenue	1,969.8	1,908.7	3,170.9
Gathering and processing	290.7	325.9	332.2
Storage and transportation	165.3	266.3	264.6
Marketing, supply and logistics	92.1	128.0	160.6
Related party (Note 16)	2.6	3.9	3.0
Total services revenues	550.7	724.1	760.4
Total revenues	2,520.5	2,632.8	3,931.3
Costs of product/services sold (exclusive of items shown separately below):
Gathering and processing	899.2	1,074.4	1,816.9
Marketing, supply and logistics	952.7	705.6	1,196.1
Related party (Note 16)	17.7	28.9	42.2
Total product costs	1,869.6	1,808.9	3,055.2
Gathering and processing	0.1	0.6	0.8
Storage and transportation	5.1	20.1	33.3
Marketing, supply and logistics	50.3	53.9	76.0
Total service costs	55.5	74.6	110.1
Total costs of products/services sold	1,925.1	1,883.5	3,165.3
Expenses:
Operations and maintenance	158.1	190.2	203.3
General and administrative	88.2	116.3	100.2
Depreciation, amortization and accretion	229.6	300.1	285.3
Total expenses	475.9	606.6	588.8
Loss on long-lived assets, net	(65.6)	(821.2)	(1.9)
Goodwill impairment	(162.6)	(1,406.3)	(48.8)
Loss on contingent consideration (Note 15)	0.0	0.0	(8.6)
Operating income (loss)	(108.7)	(2,084.8)	117.9
Earnings (loss) from unconsolidated affiliates, net	31.5	(60.8)	(0.7)
Interest and debt expense, net	(125.1)	(140.1)	(127.1)
Gain (loss) on modification/extinguishment of debt	10.0	(20.0)	0.0
Other income, net	0.5	0.6	0.6
Loss before income taxes	(191.8)	(2,305.1)	(9.3)
(Provision) benefit for income taxes	(0.3)	1.4	(1.1)
Net loss	(192.1)	(2,303.7)	(10.4)
Net income (loss) attributable to non-controlling partners	(24.2)	636.8	66.8
Net income (loss) attributable to parent	(216.3)	(1,666.9)	56.4
Net income attributable to preferred units	28.7	6.2	0.0
Net income (loss) attributable to partners	(245.0)	(1,673.1)	56.4
Subordinated unitholders’ interest in net income	0.0	0.0	1.3
Common unitholders’ interest in net income (loss)	$ (245.0)	$ (1,673.1)	$ 55.1
Net income (loss) per limited partner unit:
Basic (dollars per unit)	$ (3.55)	$ (54.00)	$ 3.03
Diluted (dollars per unit)	$ (3.55)	$ (54.00)	$ 3.03
Weighted-average limited partners’ units outstanding (in thousands):
Basic (units)	69,017	30,983	18,201
Dilutive units (units)	0	0	439
Diluted (units)	69,017	30,983	18,640
CMLP
Revenues:
Gathering and processing	$ 825.5	$ 1,051.2	$ 1,831.5
Marketing, supply and logistics	1,144.3	857.5	1,339.4
Total product revenue	1,969.8	1,908.7	3,170.9
Gathering and processing	290.7	325.9	332.2
Storage and transportation	165.3	266.3	250.8
Marketing, supply and logistics	92.1	128.0	160.6
Related party (Note 16)	2.6	3.9	3.0
Total services revenues	550.7	724.1	746.6
Total revenues	2,520.5	2,632.8	3,917.5
Costs of product/services sold (exclusive of items shown separately below):
Gathering and processing	899.2	1,074.4	1,816.9
Marketing, supply and logistics	952.7	705.6	1,196.1
Related party (Note 16)	17.7	28.9	42.2
Total product costs	1,869.6	1,808.9	3,055.2
Gathering and processing	0.1	0.6	0.8
Storage and transportation	5.1	20.1	22.8
Marketing, supply and logistics	50.3	53.9	76.0
Total service costs	55.5	74.6	99.6
Total costs of products/services sold	1,925.1	1,883.5	3,154.8
Expenses:
Operations and maintenance	155.0	188.7	195.4
General and administrative	85.6	105.6	91.7
Depreciation, amortization and accretion	240.5	278.5	255.4
Total expenses	481.1	572.8	542.5
Loss on long-lived assets, net	(65.6)	(227.8)	(35.1)
Goodwill impairment	(162.6)	(1,149.1)	(48.8)
Loss on contingent consideration (Note 15)	0.0	0.0	(8.6)
Operating income (loss)	(113.9)	(1,200.4)	127.7
Earnings (loss) from unconsolidated affiliates, net	31.5	(60.8)	(0.7)
Interest and debt expense, net	(125.1)	(130.5)	(111.4)
Gain (loss) on modification/extinguishment of debt	10.0	(18.9)	0.0
Loss before income taxes	(197.5)	(1,410.6)	15.6
(Provision) benefit for income taxes	0.0	0.0	(0.9)
Net loss	(197.5)	(1,410.6)	14.7
Net income (loss) attributable to non-controlling partners	(24.2)	(23.1)	(16.8)
Net income (loss) attributable to parent	(221.7)	(1,433.7)	(2.1)
Net income attributable to preferred units	0.0	23.1	17.2
Net income (loss) attributable to partners	$ (221.7)	$ (1,456.8)	$ (19.3)