Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income (loss)	$ 72.5	$ (37.4)	$ (15.3)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	328.9	244.2	237.4
Amortization of debt-related deferred costs and fair value adjustment	2.2	6.7	6.5
Unit-based compensation charges	37.2	34.9	30.7
Loss on long-lived assets, net	187.7	39.6	26.0
Gain on acquisition	(75.3)	0.0	0.0
Goodwill impairment	0.0	0.0	80.3
(Gain) loss on modification/extinguishment of debt	0.0	7.5	(0.1)
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	(0.7)	138.0	6.5
Deferred income taxes	1.1	(0.4)	0.1
Other	(0.1)	0.3	(0.1)
Changes in operating assets and liabilities:
Accounts receivable	149.4	(114.3)	(27.5)
Inventory	34.3	(67.4)	(33.7)
Prepaid expenses and other current assets	(2.4)	(1.0)	(3.7)
Accounts payable, accrued expenses and other liabilities	(181.3)	148.3	(1.2)
Reimbursements of property, plant and equipment	7.1	4.3	15.7
Change in price risk management activities, net	(121.4)	23.4	86.5
Net cash provided by operating activities	439.2	426.7	408.1
Investing activities
Acquisitions, net of cash acquired (Note 3)	(604.3)	0.0	(162.3)
Purchases of property, plant and equipment	(229.3)	(83.2)	(168.3)
Investments in unconsolidated affiliates	(90.9)	(17.6)	(9.4)
Capital distributions from unconsolidated affiliates	11.8	652.0	39.4
Net proceeds from sale of assets, including equity investments	521.6	17.7	27.3
Net cash provided by (used in) investing activities	(391.1)	568.9	(273.3)
Financing activities
Proceeds from the issuance of long-term debt	3,743.0	2,859.5	1,125.1
Payments on long-term debt	(3,254.3)	(3,287.5)	(975.8)
-32000000	(32.0)	(2.8)	(3.1)
Payments for deferred financing costs	(3.7)	(17.9)	0.0
Net proceeds from issuance of non-controlling interest	0.0	1.0	2.8
Purchase of common units	(123.7)	0.0	0.0
Distributions to partners	(265.2)	(164.3)	(182.7)
Distributions to non-controlling partner	(41.4)	(40.2)	(37.1)
Distributions to preferred unitholders	(60.1)	(60.1)	(60.1)
Taxes paid for unit-based compensation vesting	(15.9)	(8.4)	(15.6)
Other	(0.6)	0.0	0.0
Net cash used in financing activities	(53.9)	(996.3)	(146.5)
Net change in cash	(5.8)	(0.7)	(11.7)
Cash at beginning of period	13.3	14.0	25.7
Cash at end of period	7.5	13.3	14.0
Supplemental disclosure of cash flow information
Cash paid for interest	178.2	125.9	129.8
Cash paid for income taxes	1.8	0.8	0.6
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	7.4	(5.8)	40.0
CMLP
Operating activities
Net income (loss)	(52.2)	(44.0)	(23.4)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	334.6	258.4	251.5
Amortization of debt-related deferred costs and fair value adjustment	2.2	6.7	6.5
Unit-based compensation charges	37.2	34.9	30.7
Loss on long-lived assets, net	312.7	39.4	26.0
Gain on acquisition	(75.3)	0.0	0.0
Goodwill impairment	0.0	0.0	80.3
(Gain) loss on modification/extinguishment of debt	0.0	7.5	(0.1)
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	(0.7)	138.0	6.5
Deferred income taxes	1.2	0.0	0.0
Other	(0.1)	0.3	(0.1)
Changes in operating assets and liabilities:
Accounts receivable	149.4	(114.3)	(27.8)
Inventory	34.3	(67.4)	(33.7)
Prepaid expenses and other current assets	(2.5)	(0.6)	(4.6)
Accounts payable, accrued expenses and other liabilities	(181.3)	147.8	(6.1)
Reimbursements of property, plant and equipment	7.1	4.3	15.7
Change in price risk management activities, net	(121.4)	23.4	86.5
Net cash provided by operating activities	445.2	434.4	407.9
Investing activities
Acquisitions, net of cash acquired (Note 3)	(602.7)	0.0	(162.3)
Purchases of property, plant and equipment	(228.6)	(81.3)	(168.3)
Investments in unconsolidated affiliates	(90.9)	(17.6)	(9.4)
Capital distributions from unconsolidated affiliates	11.8	652.0	39.4
Net proceeds from sale of assets, including equity investments	521.6	17.7	27.3
Net cash provided by (used in) investing activities	(388.8)	570.8	(273.3)
Financing activities
Proceeds from the issuance of long-term debt	3,743.0	2,859.5	1,125.1
Payments on long-term debt	(3,254.3)	(3,287.5)	(975.8)
-32000000	(32.0)	(2.8)	(3.1)
Payments for deferred financing costs	(3.7)	(17.9)	0.0
Net proceeds from issuance of non-controlling interest	0.0	1.0	2.8
Contributions from partner	164.3	0.0	0.0
Distributions to partners	(622.2)	(509.7)	(242.6)
Distributions to non-controlling partner	(41.4)	(40.2)	(37.1)
Taxes paid for unit-based compensation vesting	(15.9)	(8.4)	(15.6)
Net cash used in financing activities	(62.2)	(1,006.0)	(146.3)
Net change in cash	(5.8)	(0.8)	(11.7)
Cash at beginning of period	12.9	13.7	25.4
Cash at end of period	7.1	12.9	13.7
Supplemental disclosure of cash flow information
Cash paid for interest	178.2	125.9	129.8
Cash paid for income taxes	1.3	0.5	0.5
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$ 7.4	$ (5.8)	$ 40.0