Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Total revenues	$ 1,021.2	$ 1,448.0	$ 2,284.3	$ 3,031.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	784.6	1,213.2	1,782.0	2,577.6
Operating expenses and other:
Operations and maintenance	53.2	46.6	109.8	89.0
General and administrative	25.0	26.5	56.6	69.9
Depreciation, amortization and accretion	81.1	80.6	162.5	155.4
Loss on long-lived assets, net	1.8	7.2	2.2	11.0
Total expenses	161.1	160.9	331.1	325.3
Operating income (loss)	75.5	73.9	171.2	128.9
Earnings from unconsolidated affiliates, net	132.4	6.0	134.1	9.0
Interest and debt expense, net	(55.4)	(40.1)	(111.0)	(76.2)
Other income (expense), net	0.0	(0.1)	0.1	0.2
Income (loss) before income taxes	152.5	39.7	194.4	61.9
Provision for income taxes	(0.6)	(0.3)	(0.9)	(0.3)
Net income	151.9	39.4	193.5	61.6
Net income attributable to non-controlling partner	10.3	10.3	20.5	20.5
Net income (loss) attributable to parent	141.6	29.1	173.0	41.1
Net income attributable to preferred unit holders	15.0	15.0	30.0	30.0
Net income attributable to partners	$ 126.6	$ 14.1	$ 143.0	$ 11.1
Net income per limited partner unit: (Note 12)
Basic (in dollars per share)	$ 1.20	$ 0.14	$ 1.36	$ 0.12
Diluted (in dollars per share)	$ 1.16	$ 0.14	$ 1.31	$ 0.11
Weighted-average limited partners’ units outstanding:
Basic (units)	105.3	98.0	105.2	92.0
Dilutive units (units)	4.1	4.6	4.2	4.7
Diluted (units)	109.4	102.6	109.4	96.7
Crestwood Midstream Partners LP
Revenues:
Total revenues	$ 1,021.2	$ 1,448.0	$ 2,284.3	$ 3,031.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	784.6	1,213.2	1,782.0	2,577.6
Operating expenses and other:
Operations and maintenance	53.2	46.6	109.8	89.0
General and administrative	23.6	25.0	53.8	66.7
Depreciation, amortization and accretion	81.1	83.0	162.4	161.2
Loss on long-lived assets, net	1.8	60.5	2.2	64.3
Total expenses	159.7	215.1	328.2	381.2
Operating income (loss)	76.9	19.7	174.1	73.0
Earnings from unconsolidated affiliates, net	132.4	6.0	134.1	9.0
Interest and debt expense, net	(55.4)	(40.1)	(111.0)	(76.2)
Income (loss) before income taxes	153.9	(14.4)	197.2	5.8
Provision for income taxes	(0.5)	(0.2)	(0.8)	(0.2)
Net income	153.4	(14.6)	196.4	5.6
Net income attributable to non-controlling partner	10.3	10.3	20.5	20.5
Net income (loss) attributable to parent	143.1	(24.9)	175.9	(14.9)
Crestwood Midstream Partners LP | Related Party
Operating expenses and other:
General and administrative	1.1	1.1	2.2	2.2
Product | Nonrelated Party
Revenues:
Total revenues	880.0	1,215.0	2,002.3	2,605.5
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	779.0	1,094.0	1,770.0	2,384.8
Product | Related Party
Revenues:
Total revenues	0.0	78.9	0.0	139.5
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	0.1	113.1	0.5	181.6
Product | Crestwood Midstream Partners LP | Nonrelated Party
Revenues:
Total revenues	880.0	1,215.0	2,002.3	2,605.5
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	779.0	1,094.0	1,770.0	2,384.8
Product | Crestwood Midstream Partners LP | Related Party
Revenues:
Total revenues	0.0	78.9	0.0	139.5
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	0.1	113.1	0.5	181.6
Service | Nonrelated Party
Revenues:
Total revenues	141.2	98.8	282.0	194.4
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	5.5	6.1	11.5	11.2
Service | Related Party
Revenues:
Total revenues	0.0	55.3	0.0	92.4
Service | Crestwood Midstream Partners LP | Nonrelated Party
Revenues:
Total revenues	141.2	98.8	282.0	194.4
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	5.5	6.1	11.5	11.2
Service | Crestwood Midstream Partners LP | Related Party
Revenues:
Total revenues	$ 0.0	$ 55.3	$ 0.0	$ 92.4