Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income (loss)	$ (37.4)	$ (15.3)	$ 319.9
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	244.2	237.4	195.8
Amortization of debt-related deferred costs	6.7	6.5	6.2
Unit-based compensation charges	34.9	30.7	47.0
Loss on long-lived assets, net	39.6	26.0	6.2
Goodwill impairment	0.0	0.0	(209.4)
Goodwill impairment	0.0	80.3	0.0
(Gain) loss on modification/extinguishment of debt	7.5	(0.1)	0.0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	138.0	6.5	6.9
Deferred income taxes	(0.4)	0.1	0.0
Other	0.3	(0.1)	0.0
Changes in operating assets and liabilities:
Accounts receivable	(114.3)	(27.5)	42.9
Inventory	(67.4)	(33.7)	10.9
Prepaid expenses and other current assets	(1.0)	(3.7)	0.1
Accounts payable, accrued expenses and other liabilities	148.3	(1.2)	(23.3)
Reimbursements of property, plant and equipment	4.3	15.7	24.8
Increase (Decrease) in Derivative Assets and Liabilities	23.4	86.5	(7.6)
Net cash provided by operating activities	426.7	408.1	420.4
Investing activities
Acquisitions, net of cash acquired (Note 3)	0.0	(162.3)	(462.1)
Purchases of property, plant and equipment	(83.2)	(168.3)	(455.5)
Investments in unconsolidated affiliates	(17.6)	(9.4)	(61.3)
Capital distributions from unconsolidated affiliates	652.0	39.4	35.5
Net proceeds from sale of long-lived assets, including equity investments	17.7	27.3	0.8
Other	0.0	0.0	(1.1)
Net cash provided by (used in) investing activities	568.9	(273.3)	(943.7)
Financing activities
Proceeds from the issuance of long-term debt	2,859.5	1,125.1	2,307.3
Payments on long-term debt	(3,287.5)	(975.8)	(1,729.5)
Payments on finance leases	2.8	3.1	3.5
Payments for deferred financing costs	(17.9)	0.0	(9.0)
Net proceeds from issuance of non-controlling interest	1.0	2.8	235.0
Payments for Crestwood Holdings Transactions	(275.6)	0.0	0.0
Distributions to partners	(164.3)	(182.7)	(172.4)
Distributions to non-controlling partner	(40.2)	(37.1)	(25.0)
Distributions to preferred unitholders	(60.1)	(60.1)	(60.1)
Taxes paid for unit-based compensation vesting	(8.4)	(15.6)	(11.0)
Net cash provided by (used in) financing activities	(996.3)	(146.5)	531.8
Net change in cash and restricted cash	(0.7)	(11.7)	8.5
Cash and restricted cash at beginning of period	14.0	25.7	17.2
Cash and restricted cash at end of period	13.3	14.0	25.7
Supplemental disclosure of cash flow information
Cash paid for interest	125.9	129.8	123.7
Cash paid for income taxes	0.8	0.6	0.6
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(5.8)	40.0	(27.7)
CMLP
Operating activities
Net income (loss)	(44.0)	(23.4)	310.6
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	258.4	251.5	209.9
Amortization of debt-related deferred costs	6.7	6.5	6.2
Unit-based compensation charges	34.9	30.7	47.0
Loss on long-lived assets, net	39.4	26.0	6.2
Goodwill impairment	0.0	0.0	(209.4)
Goodwill impairment	0.0	80.3	0.0
(Gain) loss on modification/extinguishment of debt	7.5	(0.1)	0.0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	138.0	6.5	6.9
Deferred income taxes	0.0	0.0	0.2
Other	0.3	(0.1)	0.0
Changes in operating assets and liabilities:
Accounts receivable	(114.3)	(27.8)	41.6
Inventory	(67.4)	(33.7)	10.9
Prepaid expenses and other current assets	(0.6)	(4.6)	0.1
Accounts payable, accrued expenses and other liabilities	147.8	(6.1)	(23.3)
Reimbursements of property, plant and equipment	4.3	15.7	24.8
Increase (Decrease) in Derivative Assets and Liabilities	23.4	86.5	(7.6)
Net cash provided by operating activities	434.4	407.9	424.1
Investing activities
Acquisitions, net of cash acquired (Note 3)	0.0	(162.3)	(462.1)
Purchases of property, plant and equipment	(81.3)	(168.3)	(455.5)
Investments in unconsolidated affiliates	(17.6)	(9.4)	(61.3)
Capital distributions from unconsolidated affiliates	652.0	39.4	35.5
Net proceeds from sale of long-lived assets, including equity investments	17.7	27.3	0.8
Other	0.0	0.0	(1.1)
Net cash provided by (used in) investing activities	570.8	(273.3)	(943.7)
Financing activities
Proceeds from the issuance of long-term debt	2,859.5	1,125.1	2,307.3
Payments on long-term debt	(3,287.5)	(975.8)	(1,729.5)
Payments on finance leases	2.8	3.1	3.5
Payments for deferred financing costs	(17.9)	0.0	(9.0)
Net proceeds from issuance of non-controlling interest	1.0	2.8	235.0
Distributions to partners	(509.7)	(242.6)	(235.8)
Distributions to non-controlling partner	(40.2)	(37.1)	(25.0)
Taxes paid for unit-based compensation vesting	(8.4)	(15.6)	(11.0)
Net cash provided by (used in) financing activities	(1,006.0)	(146.3)	528.5
Net change in cash and restricted cash	(0.8)	(11.7)	8.9
Cash and restricted cash at beginning of period	13.7	25.4	16.5
Cash and restricted cash at end of period	12.9	13.7	25.4
Supplemental disclosure of cash flow information
Cash paid for interest	125.9	129.8	123.7
Cash paid for income taxes	0.5	0.5	0.6
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$ (5.8)	$ 40.0	$ (27.7)