Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net income (loss)	$ 22.2	$ (38.3)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	74.8	59.2
Amortization of debt-related deferred costs and fair value adjustment	0.8	1.7
Unit-based compensation charges	8.6	2.3
Loss on long-lived assets, net	3.8	1.4
Loss on modification/extinguishment of debt	0.0	5.5
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	(0.4)	103.8
Deferred income taxes	(0.1)	0.0
Other Operating Activities, Cash Flow Statement	(0.1)	0.1
Changes in operating assets and liabilities	112.9	122.8
Net cash provided by operating activities	222.5	258.5
Investing activities
Acquisition, net of cash acquired (Note 3)	(145.1)	0.0
Purchases of property, plant and equipment	(26.4)	(9.3)
Investments in unconsolidated affiliates	(14.5)	(10.2)
Capital distributions from unconsolidated affiliates	5.9	17.3
Net proceeds from sale of assets	0.4	0.2
Net cash used in investing activities	(179.7)	(2.0)
Financing activities
Proceeds from the issuance of long-term debt	919.1	1,126.3
Payments on long-term debt	(859.1)	(1,018.1)
Payments on finance leases	(0.8)	(0.7)
Payments for deferred financing costs	(1.7)	(11.1)
Payments for Crestwood Holdings Transactions	0.0	(271.8)
Distributions to partners	(60.9)	(46.4)
Distributions to non-controlling partner	(10.3)	(9.3)
Distributions to preferred unitholders	(15.0)	(15.0)
Taxes paid for unit-based compensation vesting	(14.9)	(8.1)
Other	(0.6)	0.0
Net cash used in financing activities	(44.2)	(254.2)
Net change in cash	(1.4)	2.3
Cash at beginning of period	13.3	14.0
Cash at end of period	11.9	16.3
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	3.8	(2.2)
Noncash or Part Noncash Acquisition, Current Assets Acquired	63.4
Noncash or Part Noncash Acquisition, Property, Plant and Equipment	1,245.8
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	497.0
Noncash or Part Noncash Acquisition, Goodwill Acquired	39.3
Noncash or Part Noncash Acquisition, Current Liabilities Assumed	(45.9)
Noncash or Part Noncash Acquisition, Debt Assumed	(698.7)
Noncash or Part Noncash Acquisition, Invested Capital	(930.0)
Noncash or Part Noncash Acquisition, Other Liabilities Assumed	(25.8)
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	145.1
Crestwood Midstream Partners LP
Operating activities
Net income (loss)	20.2	(40.4)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	78.2	62.8
Amortization of debt-related deferred costs and fair value adjustment	0.8	1.7
Unit-based compensation charges	8.6	2.3
Loss on long-lived assets, net	3.8	1.4
Loss on modification/extinguishment of debt	0.0	5.5
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	(0.4)	103.8
Other Operating Activities, Cash Flow Statement	(0.1)	0.1
Changes in operating assets and liabilities	112.8	122.0
Net cash provided by operating activities	223.9	259.2
Investing activities
Purchases of property, plant and equipment	(26.4)	(9.3)
Investments in unconsolidated affiliates	(14.5)	(10.2)
Capital distributions from unconsolidated affiliates	5.9	17.3
Net proceeds from sale of assets	0.4	0.2
Net cash used in investing activities	(34.6)	(2.0)
Financing activities
Proceeds from the issuance of long-term debt	919.1	1,126.3
Payments on long-term debt	(859.1)	(1,018.1)
Payments on finance leases	(0.8)	(0.7)
Payments for deferred financing costs	(1.7)	(11.1)
Proceeds from Contributions from Parent	14.9	0.0
Distributions to partners	(238.1)	(334.0)
Distributions to non-controlling partner	(10.3)	(9.3)
Taxes paid for unit-based compensation vesting	(14.9)	(8.1)
Net cash used in financing activities	(190.9)	(255.0)
Net change in cash	(1.6)	2.2
Cash at beginning of period	12.9	13.7
Cash at end of period	11.3	15.9
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	3.8	$ (2.2)
Noncash or Part Noncash Acquisition, Current Assets Acquired	63.4
Noncash or Part Noncash Acquisition, Property, Plant and Equipment	1,245.8
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	497.0
Noncash or Part Noncash Acquisition, Goodwill Acquired	39.3
Noncash or Part Noncash Acquisition, Current Liabilities Assumed	(45.9)
Noncash or Part Noncash Acquisition, Debt Assumed	(698.7)
Noncash or Part Noncash Acquisition, Other Liabilities Assumed	(25.8)
Crestwood Midstream Partners LP | Oasis Midstream Partners LP
Supplemental schedule of noncash investing activities
Noncash Contribution From Parent	$ 1,075.1