Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 4,569.0	$ 2,254.3	$ 3,181.9
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 19)	136.8	21.0	45.4
Total costs of products/services sold	3,843.9	1,600.5	2,544.9
Operating expenses and other:
Operations and maintenance	121.0	131.8	138.8
General and administrative	97.6	91.5	103.4
Depreciation, amortization and accretion	244.2	237.4	195.8
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
Total expenses	502.4	567.0	234.8
Operating income	222.7	86.8	402.2
Earnings (loss) from unconsolidated affiliates, net	(120.4)	32.5	32.8
Interest and debt expense, net	(132.1)	(133.6)	(115.4)
Gain (loss) on modification/extinguishment of debt	(7.5)	0.1	0.0
Other income (expense), net	0.1	(0.7)	0.6
Income (loss) before income taxes	(37.2)	(14.9)	320.2
Provision for income taxes	(0.2)	(0.4)	(0.3)
Net income (loss)	(37.4)	(15.3)	319.9
Net income attributable to non-controlling partner	41.1	40.8	34.8
Net income (loss) attributable to parent	(78.5)	(56.1)	285.1
Net income attributable to preferred units	60.1	60.1	60.1
Net income (loss) attributable to partners	$ (138.6)	$ (116.2)	$ 225.0
Net income (loss) per limited partner unit: (Note 14)
Basic (dollars per unit)	$ (2.11)	$ (1.59)	$ 3.11
Diluted (dollars per unit)	$ (2.11)	$ (1.59)	$ 2.93
Weighted-average limited partners’ units outstanding:
Basic (units)	65.6	73.2	71.8
Dilutive units (units)	0.0	0.0	5.1
Diluted (units)	65.6	73.2	76.9
CMLP
Revenues:
Revenues	$ 4,569.0	$ 2,254.3	$ 3,181.9
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 19)	136.8	21.0	45.4
Total costs of products/services sold	3,843.9	1,600.5	2,544.9
Operating expenses and other:
Operations and maintenance	121.0	131.8	138.8
General and administrative	90.2	86.7	98.2
Depreciation, amortization and accretion	258.4	251.5	209.9
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
Total expenses	509.0	576.3	243.7
Operating income	216.1	77.5	393.3
Earnings (loss) from unconsolidated affiliates, net	(120.4)	32.5	32.8
Interest and debt expense, net	(132.1)	(133.6)	(115.4)
Gain (loss) on modification/extinguishment of debt	(7.5)	0.1	0.0
Other income (expense), net	0.0	0.0	0.2
Income (loss) before income taxes	(43.9)	(23.5)	310.9
Provision for income taxes	(0.1)	0.1	(0.3)
Net income (loss)	(44.0)	(23.4)	310.6
Net income attributable to non-controlling partner	41.1	40.8	34.8
Net income (loss) attributable to parent	(85.1)	(64.2)	275.8
Product
Revenues:
Revenues	4,145.4	1,793.0	2,752.4
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	3,688.8	1,558.8	2,469.7
Product | CMLP
Revenues:
Revenues	4,145.4	1,793.0	2,752.4
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	3,688.8	1,558.8	2,469.7
Product, Related Party
Revenues:
Revenues	25.8	27.3	2.9
Product, Related Party | CMLP
Revenues:
Revenues	25.8	27.3	2.9
Service
Revenues:
Revenues	396.4	433.5	426.6
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	18.3	20.7	29.8
Service | CMLP
Revenues:
Revenues	396.4	433.5	426.6
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	18.3	20.7	29.8
Service, Related Party
Revenues:
Revenues	1.4	0.5	0.0
Service, Related Party | CMLP
Revenues:
Revenues	$ 1.4	$ 0.5	$ 0.0