Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 352.7	$ 683.4	$ 1,080.6	$ 1,518.6
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 12)	3.6	0.9	6.8	35.3
Total costs of product/services sold	225.7	537.2	760.1	1,232.8
Operating expenses and other:
Operations and maintenance	31.6	34.7	69.2	63.3
General and administrative	29.5	22.3	44.4	59.5
Depreciation, amortization and accretion	61.0	49.3	117.1	89.1
Loss on long-lived assets, net	3.8	0.0	4.8	2.0
Goodwill impairment	0.0	0.0	80.3	0.0
Gain on acquisition	0.0	(209.4)	0.0	(209.4)
Total expenses	125.9	(103.1)	315.8	4.5
Operating income (loss)	1.1	249.3	4.7	281.3
Earnings from unconsolidated affiliates, net	8.4	3.7	13.9	10.6
Interest and debt expense, net	(34.0)	(27.8)	(66.6)	(52.7)
Other income, net	0.1	0.1	0.2	0.2
Income (loss) before income taxes	(24.4)	225.3	(47.8)	239.4
(Provision) benefit for income taxes	(0.1)	0.3	(0.1)	0.3
Net income (loss)	(24.3)	225.0	(47.7)	239.1
Net income attributable to non-controlling partner	10.2	10.6	20.1	14.6
Net income (loss) attributable to parent	(34.5)	214.4	(67.8)	224.5
Net income attributable to preferred unit holders	15.0	15.0	30.0	30.0
Net income (loss) attributable to partners	(49.5)	199.4	(97.8)	194.5
Subordinated unitholders’ interest in net income	0.0	1.2	0.0	1.2
Common unitholders’ interest in net income (loss)	$ (49.5)	$ 198.2	$ (97.8)	$ 193.3
Net income (loss) per limited partner unit:
Basic (in dollars per share)	$ (0.68)	$ 2.76	$ (1.34)	$ 2.69
Diluted (in dollars per share)	$ (0.68)	$ 2.58	$ (1.34)	$ 2.53
Weighted-average limited partners’ units outstanding:
Basic (units)	73.2	71.8	73.0	71.8
Dilutive units (units)	0.0	11.2	0.0	5.2
Diluted (units)	73.2	83.0	73.0	77.0
Crestwood Midstream Partners LP
Revenues:
Revenues	$ 352.7	$ 683.4	$ 1,080.6	$ 1,518.6
Related party (Note 12)	0.1	0.0	0.3	0.0
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 12)	3.6	0.9	6.8	35.3
Total costs of product/services sold	225.7	537.2	760.1	1,232.8
Operating expenses and other:
Operations and maintenance	31.6	34.7	69.2	63.3
General and administrative	28.4	20.9	41.9	56.9
Depreciation, amortization and accretion	64.6	52.7	124.2	96.1
Loss on long-lived assets, net	3.8	0.0	4.8	2.0
Goodwill impairment	0.0	0.0	80.3	0.0
Gain on acquisition	0.0	(209.4)	0.0	(209.4)
Total expenses	128.4	(101.1)	320.4	8.9
Operating income (loss)	(1.4)	247.3	0.1	276.9
Earnings from unconsolidated affiliates, net	8.4	3.7	13.9	10.6
Interest and debt expense, net	(34.0)	(27.8)	(66.6)	(52.7)
Income (loss) before income taxes	(27.0)	223.2	(52.6)	234.8
(Provision) benefit for income taxes	(0.2)	0.3	(0.2)	0.3
Net income (loss)	(26.8)	222.9	(52.4)	234.5
Net income attributable to non-controlling partner	10.2	10.6	20.1	14.6
Net income (loss) attributable to parent	(37.0)	212.3	(72.5)	219.9
Product
Revenues:
Revenues	258.4	579.6	864.9	1,327.2
Related party (Note 12)	7.4	1.3	14.7	2.5
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	217.4	529.5	742.0	1,183.0
Product | Crestwood Midstream Partners LP
Revenues:
Revenues	258.4	579.6	864.9	1,327.2
Related party (Note 12)	7.4	1.3	14.7	2.5
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	217.4	529.5	742.0	1,183.0
Service
Revenues:
Revenues	94.3	103.8	215.7	191.4
Related party (Note 12)	0.1	0.0	0.3	0.0
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	4.7	6.8	11.3	14.5
Service | Crestwood Midstream Partners LP
Revenues:
Revenues	94.3	103.8	215.7	191.4
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	4.7	6.8	11.3	14.5
Gathering and Processing Segment | Product
Revenues:
Revenues	30.5	106.2	133.2	215.8
Gathering and Processing Segment | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	30.5	106.2	133.2	215.8
Gathering and Processing Segment | Service
Revenues:
Revenues	84.0	93.5	196.2	166.2
Gathering and Processing Segment | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	84.0	93.5	196.2	166.2
Marketing Supply and Logistics
Revenues:
Revenues				1,123.9
Marketing Supply and Logistics | Product
Revenues:
Revenues	220.5	472.1	717.0	1,108.9
Marketing Supply and Logistics | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	220.5	472.1	717.0	1,108.9
Marketing Supply and Logistics | Service
Revenues:
Revenues	7.1	5.4	12.6	12.5
Marketing Supply and Logistics | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	7.1	5.4	12.6	12.5
Storage and Transportation | Service
Revenues:
Revenues	3.1	4.9	6.6	12.7
Storage and Transportation | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	$ 3.1	$ 4.9	$ 6.6	$ 12.7