Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Total revenues	$ 1,139.4	$ 1,566.0	$ 3,423.7	$ 4,597.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	901.6	1,286.8	2,683.6	3,864.4
Operating expenses and other:
Operations and maintenance	56.9	55.0	166.7	144.0
General and administrative	30.2	33.9	86.8	103.8
Depreciation, amortization and accretion	80.2	86.9	242.7	242.3
Loss on long-lived assets, net	2.6	175.9	4.8	186.9
Gain on acquisition	0.0	(75.3)	0.0	(75.3)
Total expenses	169.9	276.4	501.0	601.7
Operating income (loss)	67.9	2.8	239.1	131.7
Earnings from unconsolidated affiliates, net	1.1	3.2	135.2	12.2
Interest and debt expense, net	(56.9)	(47.6)	(167.9)	(123.8)
Other income, net	0.2	0.0	0.3	0.2
Income (loss) before income taxes	12.3	(41.6)	206.7	20.3
Provision for income taxes	(0.2)	(1.4)	(1.1)	(1.7)
Net income (loss)	12.1	(43.0)	205.6	18.6
Net income attributable to non-controlling partner	32.1	10.3	52.6	30.8
Net income (loss) attributable to parent	(20.0)	(53.3)	153.0	(12.2)
Net income attributable to preferred unit holders	15.1	15.0	45.1	45.0
Net income (loss) attributable to partners	$ (35.1)	$ (68.3)	$ 107.9	$ (57.2)
Net income (loss) per limited partner unit: (Note 12)
Basic (in dollars per share)	$ (0.33)	$ (0.64)	$ 1.03	$ (0.59)
Diluted (in dollars per share)	$ (0.33)	$ (0.64)	$ 0.99	$ (0.59)
Weighted-average limited partners’ units outstanding:
Basic (units)	105.2	107.1	105.2	97.1
Dilutive units (units)	0.0	0.0	3.9	0.0
Diluted (units)	105.2	107.1	109.1	97.1
Crestwood Midstream Partners LP
Revenues:
Total revenues	$ 1,139.4	$ 1,566.0	$ 3,423.7	$ 4,597.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	901.6	1,286.8	2,683.6	3,864.4
Operating expenses and other:
Operations and maintenance	56.9	55.0	166.7	144.0
General and administrative	20.8	32.3	74.6	99.0
Depreciation, amortization and accretion	80.1	86.8	242.5	248.0
Loss on long-lived assets, net	2.6	247.6	4.8	311.9
Gain on acquisition	0.0	(75.3)	0.0	(75.3)
Total expenses	160.4	346.4	488.6	727.6
Operating income (loss)	77.4	(67.2)	251.5	5.8
Earnings from unconsolidated affiliates, net	1.1	3.2	135.2	12.2
Interest and debt expense, net	(56.9)	(47.6)	(167.9)	(123.8)
Income (loss) before income taxes	21.6	(111.6)	218.8	(105.8)
Provision for income taxes	(0.2)	(1.4)	(1.0)	(1.6)
Net income (loss)	21.4	(113.0)	217.8	(107.4)
Net income attributable to non-controlling partner	32.1	10.3	52.6	30.8
Net income (loss) attributable to parent	(10.7)	(123.3)	165.2	(138.2)
Crestwood Midstream Partners LP | Related Party
Operating expenses and other:
General and administrative	1.1	1.1	3.3	3.3
Product | Nonrelated Party
Revenues:
Total revenues	989.2	1,332.8	2,991.5	3,938.3
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	898.1	1,228.6	2,668.1	3,613.4
Product | Related Party
Revenues:
Total revenues	0.0	83.2	0.0	222.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	0.0	51.3	0.5	232.9
Product | Crestwood Midstream Partners LP | Nonrelated Party
Revenues:
Total revenues	989.2	1,332.8	2,991.5	3,938.3
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	898.1	1,228.6	2,668.1	3,613.4
Product | Crestwood Midstream Partners LP | Related Party
Revenues:
Total revenues	0.0	83.2	0.0	222.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	0.0	51.3	0.5	232.9
Service | Nonrelated Party
Revenues:
Total revenues	150.2	92.4	432.2	286.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	3.5	6.9	15.0	18.1
Service | Related Party
Revenues:
Total revenues	0.0	57.6	0.0	150.0
Service | Crestwood Midstream Partners LP | Nonrelated Party
Revenues:
Total revenues	150.2	92.4	432.2	286.8
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	3.5	6.9	15.0	18.1
Service | Crestwood Midstream Partners LP | Related Party
Revenues:
Total revenues	$ 0.0	$ 57.6	$ 0.0	$ 150.0