Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income (loss)	$ (116.0)	$ (43.1)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	182.6	177.9
Amortization of debt-related deferred costs	5.1	4.9
Unit-based compensation charges	22.8	17.3
Loss on long-lived assets, net	19.6	26.1
Goodwill impairment	0.0	80.3
Loss on modification/extinguishment of debt	6.7	0.0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	137.5	5.4
Deferred income taxes	(0.4)	(0.4)
Other Operating Activities, Cash Flow Statement	0.2	0.0
Changes in operating assets and liabilities	114.8	26.9
Net cash provided by operating activities	372.9	295.3
Investing activities
Acquisition, net of cash acquired (Note 3)	0.0	(162.3)
Purchases of property, plant and equipment	(55.8)	(158.8)
Investments in unconsolidated affiliates	(10.2)	(6.0)
Capital distributions from unconsolidated affiliates	648.4	27.8
Other	0.5	1.6
Net cash provided by (used in) investing activities	582.9	(297.7)
Financing activities
Proceeds from the issuance of long-term debt	2,236.4	947.0
Payments on long-term debt	(2,695.9)	(731.1)
Payments on finance leases	(2.1)	(2.4)
Payments for deferred financing costs	(11.1)	0.0
Net proceeds from issuance of non-controlling interest	1.0	2.8
Payments for Crestwood Holdings Transactions	(275.6)	0.0
Distributions to partners	(125.0)	(136.7)
Distributions to non-controlling partner	(29.9)	(27.8)
Distributions to preferred unitholders	(45.0)	(45.0)
Taxes paid for unit-based compensation vesting	(8.3)	(15.6)
Net cash used in financing activities	(955.5)	(8.8)
Net change in cash	0.3	(11.2)
Cash at beginning of period	14.0	25.7
Cash at end of period	14.3	14.5
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(9.2)	40.0
Crestwood Midstream Partners LP
Operating activities
Net income (loss)	(120.7)	(50.1)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	193.2	188.4
Amortization of debt-related deferred costs	5.1	4.9
Unit-based compensation charges	22.8	17.3
Loss on long-lived assets, net	19.6	26.1
Goodwill impairment	0.0	80.3
Loss on modification/extinguishment of debt	6.7	0.0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	137.5	5.4
Deferred income taxes	0.0	(0.1)
Other Operating Activities, Cash Flow Statement	0.2	0.0
Changes in operating assets and liabilities	114.1	21.8
Net cash provided by operating activities	378.5	294.0
Investing activities
Acquisition, net of cash acquired (Note 3)	0.0	(162.3)
Purchases of property, plant and equipment	(55.8)	(158.8)
Investments in unconsolidated affiliates	(10.2)	(6.0)
Capital distributions from unconsolidated affiliates	648.4	27.8
Other	0.5	1.6
Net cash provided by (used in) investing activities	582.9	(297.7)
Financing activities
Proceeds from the issuance of long-term debt	2,236.4	947.0
Payments on long-term debt	(2,695.9)	(731.1)
Payments on finance leases	(2.1)	(2.4)
Payments for deferred financing costs	(11.1)	0.0
Net proceeds from issuance of non-controlling interest	1.0	2.8
Distributions to partners	(451.3)	(180.9)
Distributions to non-controlling partner	(29.9)	(27.8)
Taxes paid for unit-based compensation vesting	(8.3)	(15.6)
Net cash used in financing activities	(961.2)	(8.0)
Net change in cash	0.2	(11.7)
Cash at beginning of period	13.7	25.4
Cash at end of period	13.9	13.7
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(9.2)	40.0
Non-Controlling Partners
Financing activities
Net proceeds from issuance of non-controlling interest	$ 1.0	$ 2.8