Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues	$ 519.2	$ 823.6	$ 1,599.8	$ 2,342.2
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 12)	6.1	3.8	12.9	39.1
Total costs of product/services sold	358.7	657.4	1,118.8	1,890.2
Operating expenses and other:
Operations and maintenance	31.0	36.0	100.2	99.3
General and administrative	19.6	24.9	64.0	84.4
Depreciation, amortization and accretion	60.8	51.5	177.9	140.6
Loss on long-lived assets, net	21.3	0.1	26.1	2.1
Goodwill impairment	0.0	0.0	80.3	0.0
Gain on acquisition	0.0	0.0	0.0	(209.4)
Total expenses	132.7	112.5	448.5	117.0
Operating income (loss)	27.8	53.7	32.5	335.0
Earnings from unconsolidated affiliates, net	10.5	10.4	24.4	21.0
Interest and debt expense, net	(33.7)	(30.6)	(100.3)	(83.3)
Other income, net	0.0	0.1	0.2	0.3
Income (loss) before income taxes	4.6	33.6	(43.2)	273.0
(Provision) benefit for income taxes	0.0	0.0	0.1	(0.3)
Net income (loss)	4.6	33.6	(43.1)	272.7
Net income attributable to non-controlling partner	10.3	9.9	30.4	24.5
Net income (loss) attributable to parent	(5.7)	23.7	(73.5)	248.2
Net income attributable to preferred unit holders	15.0	15.0	45.0	45.0
Net income (loss) attributable to partners	(20.7)	8.7	(118.5)	203.2
Subordinated unitholders’ interest in net income	0.0	0.1	0.0	1.2
Common unitholders’ interest in net income (loss)	$ (20.7)	$ 8.6	$ (118.5)	$ 202.0
Net income (loss) per limited partner unit:
Basic (in dollars per share)	$ (0.28)	$ 0.12	$ (1.62)	$ 2.81
Diluted (in dollars per share)	$ (0.28)	$ 0.12	$ (1.62)	$ 2.66
Weighted-average limited partners’ units outstanding:
Basic (units)	73.4	71.8	73.1	71.8
Dilutive units (units)	0.0	3.7	0.0	4.6
Diluted (units)	73.4	75.5	73.1	76.4
Crestwood Midstream Partners LP
Revenues:
Revenues	$ 519.2	$ 823.6	$ 1,599.8	$ 2,342.2
Related party (Note 12)	0.2	0.0	0.5	0.0
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 12)	6.1	3.8	12.9	39.1
Total costs of product/services sold	358.7	657.4	1,118.8	1,890.2
Operating expenses and other:
Operations and maintenance	31.0	36.0	100.2	99.3
General and administrative	18.5	23.7	60.4	80.6
Depreciation, amortization and accretion	64.2	55.1	188.4	151.2
Loss on long-lived assets, net	21.3	0.1	26.1	2.1
Goodwill impairment	0.0	0.0	80.3	0.0
Gain on acquisition	0.0	0.0	0.0	(209.4)
Total expenses	135.0	114.9	455.4	123.8
Operating income (loss)	25.5	51.3	25.6	328.2
Earnings from unconsolidated affiliates, net	10.5	10.4	24.4	21.0
Interest and debt expense, net	(33.7)	(30.6)	(100.3)	(83.3)
Income (loss) before income taxes	2.3	31.1	(50.3)	265.9
(Provision) benefit for income taxes	0.0	0.1	0.2	(0.2)
Net income (loss)	2.3	31.2	(50.1)	265.7
Net income attributable to non-controlling partner	10.3	9.9	30.4	24.5
Net income (loss) attributable to parent	(8.0)	21.3	(80.5)	241.2
Product
Revenues:
Revenues	417.2	710.7	1,282.1	2,037.9
Related party (Note 12)	10.7	0.3	25.4	2.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	348.2	646.8	1,090.2	1,829.8
Product | Crestwood Midstream Partners LP
Revenues:
Revenues	417.2	710.7	1,282.1	2,037.9
Related party (Note 12)	10.7	0.3	25.4	2.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	348.2	646.8	1,090.2	1,829.8
Service
Revenues:
Revenues	102.0	112.9	317.7	304.3
Related party (Note 12)	0.2	0.0	0.5	0.0
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	4.4	6.8	15.7	21.3
Service | Crestwood Midstream Partners LP
Revenues:
Revenues	102.0	112.9	317.7	304.3
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	4.4	6.8	15.7	21.3
Gathering and Processing Segment | Product
Revenues:
Revenues	54.0	155.0	187.2	370.8
Gathering and Processing Segment | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	54.0	155.0	187.2	370.8
Gathering and Processing Segment | Service
Revenues:
Revenues	91.2	102.8	287.4	269.0
Gathering and Processing Segment | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	91.2	102.8	287.4	269.0
Marketing Supply and Logistics
Revenues:
Revenues				1,685.6
Marketing Supply and Logistics | Product
Revenues:
Revenues	352.5	555.4	1,069.5	1,664.3
Marketing Supply and Logistics | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	352.5	555.4	1,069.5	1,664.3
Marketing Supply and Logistics | Service
Revenues:
Revenues	7.1	6.0	19.7	18.5
Marketing Supply and Logistics | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	7.1	6.0	19.7	18.5
Storage and Transportation | Service
Revenues:
Revenues	3.5	4.1	10.1	16.8
Storage and Transportation | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	$ 3.5	$ 4.1	$ 10.1	$ 16.8