Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues	$ 727.9	$ 835.2
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 11)	3.2	34.4
Total costs of product/services sold	534.4	695.6
Operating expenses and other:
Operations and maintenance	37.6	28.6
General and administrative	14.9	37.2
Depreciation, amortization and accretion	56.1	39.8
Loss on long-lived assets, net	1.0	2.0
Goodwill, Impairment Loss	80.3	0.0
Total expenses	189.9	107.6
Operating income (loss)	3.6	32.0
Earnings from unconsolidated affiliates, net	5.5	6.9
Interest and debt expense, net	(32.6)	(24.9)
Other income, net	0.1	0.1
Net income (loss)	(23.4)	14.1
Net Income Attributable to Noncontrolling Interest	9.9	4.0
Net income (loss) attributable to parent	(33.3)	10.1
Net income attributable to preferred unit holders	15.0	15.0
Net loss attributable to partners	(48.3)	(4.9)
Common unitholders’ interest in net loss	$ (48.3)	$ (4.9)
Net loss per limited partner unit:
Basic (in dollars per share)	$ (0.66)	$ (0.07)
Diluted (in dollars per share)	$ (0.66)	$ (0.07)
Weighted-average limited partners’ units outstanding:
Basic (units)	72,900	71,800
Dilutive units (units)	0	0
Diluted (units)	72,900	71,800
Crestwood Midstream Partners LP
Revenues:
Revenues	$ 727.9	$ 835.2
Related party (Note 11)	0.2	0.0
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 11)	3.2	34.4
Total costs of product/services sold	534.4	695.6
Operating expenses and other:
Operations and maintenance	37.6	28.6
General and administrative	13.5	36.0
Depreciation, amortization and accretion	59.6	43.4
Loss on long-lived assets, net	1.0	2.0
Goodwill, Impairment Loss	80.3	0.0
Total expenses	192.0	110.0
Operating income (loss)	1.5	29.6
Earnings from unconsolidated affiliates, net	5.5	6.9
Interest and debt expense, net	(32.6)	(24.9)
Net income (loss)	(25.6)	11.6
Net Income Attributable to Noncontrolling Interest	9.9	4.0
Net income (loss) attributable to parent	(35.5)	7.6
Product
Revenues:
Revenues	606.5	747.6
Related party (Note 11)	7.3	1.2
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	524.6	653.5
Product | Crestwood Midstream Partners LP
Revenues:
Revenues	606.5	747.6
Related party (Note 11)	7.3	1.2
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	524.6	653.5
Service
Revenues:
Revenues	121.4	87.6
Related party (Note 11)	0.2	0.0
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	6.6	7.7
Service | Crestwood Midstream Partners LP
Revenues:
Revenues	121.4	87.6
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	6.6	7.7
Gathering and Processing Segment
Revenues:
Revenues	214.9	182.3
Costs of product/services sold (exclusive of items shown separately below):
Total costs of product/services sold	108.3	138.0
Operating expenses and other:
Operations and maintenance	27.0	18.1
General and administrative	0.0	0.0
Loss on long-lived assets, net	1.0	1.8
Goodwill, Impairment Loss	80.3
Earnings from unconsolidated affiliates, net	0.8	(0.2)
Gathering and Processing Segment | Crestwood Midstream Partners LP
Revenues:
Revenues	214.9	182.3
Costs of product/services sold (exclusive of items shown separately below):
Total costs of product/services sold	108.3	138.0
Operating expenses and other:
Operations and maintenance	27.0	18.1
General and administrative	0.0	0.0
Loss on long-lived assets, net	1.0	1.8
Goodwill, Impairment Loss	80.3
Earnings from unconsolidated affiliates, net	0.8	(0.2)
Gathering and Processing Segment | Product
Revenues:
Revenues	102.7	109.6
Gathering and Processing Segment | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	102.7	109.6
Gathering and Processing Segment | Service
Revenues:
Revenues	112.2	72.7
Gathering and Processing Segment | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	112.2	72.7
Marketing Supply and Logistics
Revenues:
Revenues	509.5	645.1
Costs of product/services sold (exclusive of items shown separately below):
Total costs of product/services sold	425.9	557.6
Operating expenses and other:
Operations and maintenance	9.2	9.5
General and administrative	0.0	0.0
Loss on long-lived assets, net	0.0	0.2
Goodwill, Impairment Loss	0.0
Earnings from unconsolidated affiliates, net	0.0	0.0
Marketing Supply and Logistics | Crestwood Midstream Partners LP
Revenues:
Revenues	509.5	645.1
Costs of product/services sold (exclusive of items shown separately below):
Total costs of product/services sold	425.9	557.6
Operating expenses and other:
Operations and maintenance	9.2	9.5
General and administrative	0.0	0.0
Loss on long-lived assets, net	0.0	0.2
Goodwill, Impairment Loss	0.0
Earnings from unconsolidated affiliates, net	0.0	0.0
Marketing Supply and Logistics | Product
Revenues:
Revenues	496.5	636.8
Marketing Supply and Logistics | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	496.5	636.8
Marketing Supply and Logistics | Service
Revenues:
Revenues	5.5	7.1
Marketing Supply and Logistics | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	5.5	7.1
Storage and Transportation
Revenues:
Revenues	3.5	7.8
Costs of product/services sold (exclusive of items shown separately below):
Total costs of product/services sold	0.2	0.0
Operating expenses and other:
Operations and maintenance	1.4	1.0
General and administrative	0.0	0.0
Loss on long-lived assets, net	0.0	0.0
Goodwill, Impairment Loss	0.0
Earnings from unconsolidated affiliates, net	4.7	7.1
Storage and Transportation | Crestwood Midstream Partners LP
Revenues:
Revenues	3.5	7.8
Costs of product/services sold (exclusive of items shown separately below):
Total costs of product/services sold	0.2	0.0
Operating expenses and other:
Operations and maintenance	1.4	1.0
General and administrative	0.0	0.0
Loss on long-lived assets, net	0.0	0.0
Goodwill, Impairment Loss	0.0
Earnings from unconsolidated affiliates, net	4.7	7.1
Storage and Transportation | Service
Revenues:
Revenues	3.5	7.8
Storage and Transportation | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	$ 3.5	$ 7.8