Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenues	$ 1,226.3	$ 519.2	$ 3,188.6	$ 1,599.8
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 15)	34.8	6.1	101.3	12.9
Total costs of product/services sold	1,099.3	358.7	2,710.3	1,118.8
Operating expenses and other:
Operations and maintenance	31.6	31.0	90.2	100.2
General and administrative	25.9	19.6	67.4	64.0
Depreciation, amortization and accretion	64.6	60.8	182.6	177.9
Loss on long-lived assets, net	18.5	21.3	19.6	26.1
Goodwill impairment	0.0	0.0	0.0	80.3
Total expenses	140.6	132.7	359.8	448.5
Operating income (loss)	(13.6)	27.8	118.5	32.5
Earnings (loss) from unconsolidated affiliates, net	4.9	10.5	(125.9)	24.4
Interest and debt expense, net	(30.9)	(33.7)	(102.0)	(100.3)
Gain (Loss) on Extinguishment of Debt	0.0	0.0	(6.7)	0.0
Other income, net	0.1	0.0	0.2	0.2
Income (loss) before income taxes	(39.5)	4.6	(115.9)	(43.2)
(Provision) benefit for income taxes	(0.1)	0.0	(0.1)	0.1
Net income (loss)	(39.6)	4.6	(116.0)	(43.1)
Net income attributable to non-controlling partner	10.3	10.3	30.7	30.4
Net income (loss) attributable to parent	(49.9)	(5.7)	(146.7)	(73.5)
Net income attributable to preferred unit holders	15.0	15.0	45.0	45.0
Net loss attributable to partners	$ (64.9)	$ (20.7)	$ (191.7)	$ (118.5)
Net loss per limited partner unit: (Note 12)
Basic (in dollars per share)	$ (1.03)	$ (0.28)	$ (2.88)	$ (1.62)
Diluted (in dollars per share)	$ (1.03)	$ (0.28)	$ (2.88)	$ (1.62)
Weighted-average limited partners’ units outstanding:
Basic (units)	62.9	73.4	66.6	73.1
Diluted (units)	62.9	73.4	66.6	73.1
Affiliated Entity
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 15)	$ 34.8	$ 6.1	$ 101.3	$ 12.9
Crestwood Midstream Partners LP
Revenues:
Revenues	1,226.3	519.2	3,188.6	1,599.8
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 15)	34.8	6.1	101.3	12.9
Total costs of product/services sold	1,099.3	358.7	2,710.3	1,118.8
Operating expenses and other:
Operations and maintenance	31.6	31.0	90.2	100.2
General and administrative	24.4	18.5	61.3	60.4
Depreciation, amortization and accretion	68.2	64.2	193.2	188.4
Loss on long-lived assets, net	18.5	21.3	19.6	26.1
Goodwill impairment	0.0	0.0	0.0	80.3
Total expenses	142.7	135.0	364.3	455.4
Operating income (loss)	(15.7)	25.5	114.0	25.6
Earnings (loss) from unconsolidated affiliates, net	4.9	10.5	(125.9)	24.4
Interest and debt expense, net	(30.9)	(33.7)	(102.0)	(100.3)
Gain (Loss) on Extinguishment of Debt	0.0	0.0	(6.7)	0.0
Income (loss) before income taxes	(41.7)	2.3	(120.6)	(50.3)
(Provision) benefit for income taxes	(0.1)	0.0	(0.1)	0.2
Net income (loss)	(41.8)	2.3	(120.7)	(50.1)
Net income attributable to non-controlling partner	10.3	10.3	30.7	30.4
Net income (loss) attributable to parent	(52.1)	(8.0)	(151.4)	(80.5)
Product
Revenues:
Revenues	1,127.3	417.2	2,896.3	1,282.1
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	1,060.2	348.2	2,595.8	1,090.2
Product | Affiliated Entity
Revenues:
Revenues	6.5	10.7	24.2	25.4
Product | Crestwood Midstream Partners LP
Revenues:
Revenues	1,127.3	417.2	2,896.3	1,282.1
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	1,060.2	348.2	2,595.8	1,090.2
Product | Crestwood Midstream Partners LP | Affiliated Entity
Revenues:
Revenues	6.5	10.7	24.2	25.4
Service
Revenues:
Revenues	99.0	102.0	292.3	317.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	4.3	4.4	13.2	15.7
Service | Affiliated Entity
Revenues:
Revenues	0.6	0.2	1.0	0.5
Service | Crestwood Midstream Partners LP
Revenues:
Revenues	99.0	102.0	292.3	317.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	4.3	4.4	13.2	15.7
Service | Crestwood Midstream Partners LP | Affiliated Entity
Revenues:
Revenues	0.6	0.2	1.0	0.5
Gathering and Processing Segment | Product
Revenues:
Revenues	82.0	54.0	237.2	187.2
Gathering and Processing Segment | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	82.0	54.0	237.2	187.2
Gathering and Processing Segment | Service
Revenues:
Revenues	88.8	91.2	261.1	287.4
Gathering and Processing Segment | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	88.8	91.2	261.1	287.4
Marketing Supply and Logistics | Product
Revenues:
Revenues	1,038.8	352.5	2,634.9	1,069.5
Marketing Supply and Logistics | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	1,038.8	352.5	2,634.9	1,069.5
Marketing Supply and Logistics | Service
Revenues:
Revenues	7.6	7.1	24.2	19.7
Marketing Supply and Logistics | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	7.6	7.1	24.2	19.7
Storage and Transportation | Service
Revenues:
Revenues	2.0	3.5	6.0	10.1
Storage and Transportation | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	$ 2.0	$ 3.5	$ 6.0	$ 10.1