Segments (Summary Of Segment Information) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating revenues	$ 3,181.9	$ 3,654.1	$ 3,880.9
Intersegment Revenues	0.0	0.0	0.0
Costs of product/services sold	2,544.9	3,129.4	3,374.7
Operations and maintenance	138.8	125.8	136.0
General and administrative	103.4	88.1	96.5
Gain (loss) on long-lived assets, net	(6.2)	(28.6)	(65.6)
Goodwill impairment	0.0	0.0	(38.8)
Loss on contingent consideration	0.0	0.0	(57.0)
Gain on acquisition	209.4	0.0	0.0
Earnings from unconsolidated affiliates, net	32.8	53.3	47.8
Other income, net	0.6	0.4	1.3
EBITDA	631.4	335.9	161.4
Goodwill	218.9	138.6	147.6
Assets	5,349.3	4,294.5
Purchases of property, plant and equipment	455.5	305.5	188.4
CMLP
Segment Reporting Information [Line Items]
Operating revenues	3,181.9	3,654.1	3,880.9
Intersegment Revenues	0.0	0.0	0.0
Costs of product/services sold	2,544.9	3,129.4	3,374.7
Operations and maintenance	138.8	125.8	136.0
General and administrative	98.2	83.5	93.1
Gain (loss) on long-lived assets, net	(6.2)	(28.6)	(65.6)
Goodwill impairment	0.0	0.0	(38.8)
Loss on contingent consideration	0.0	0.0	(57.0)
Gain on acquisition	209.4	0.0	0.0
Earnings from unconsolidated affiliates, net	32.8	53.3	47.8
Other income, net	0.2	0.0	0.8
EBITDA	636.2	340.1	164.3
Goodwill	218.9	138.6
Assets	5,504.0	4,462.0
Purchases of property, plant and equipment	455.5	305.5	188.4
Corporate
Segment Reporting Information [Line Items]
Operating revenues	0.0	0.0	0.0
Intersegment Revenues	0.0	0.0	0.0
Costs of product/services sold	0.0	0.0	0.0
Operations and maintenance	0.0	0.0	0.0
General and administrative	103.4	88.1	96.5
Gain (loss) on long-lived assets, net	0.2	1.7	(3.0)
Goodwill impairment			0.0
Loss on contingent consideration			0.0
Gain on acquisition	0.0
Earnings from unconsolidated affiliates, net	0.0	0.0	0.0
Other income, net	0.6	0.4	0.5
EBITDA	(102.6)	(86.0)	(99.0)
Goodwill	0.0	0.0
Assets	29.1	44.2
Purchases of property, plant and equipment	1.9	4.6	6.7
Corporate \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	0.0	0.0	0.0
Intersegment Revenues	0.0	0.0	0.0
Costs of product/services sold	0.0	0.0	0.0
Operations and maintenance	0.0	0.0	0.0
General and administrative	98.2	83.5	93.1
Gain (loss) on long-lived assets, net	0.2	1.7	(3.0)
Goodwill impairment			0.0
Loss on contingent consideration			0.0
Gain on acquisition	0.0
Earnings from unconsolidated affiliates, net	0.0	0.0	0.0
Other income, net	0.2		0.0
EBITDA	(97.8)	(81.8)	(96.1)
Goodwill	0.0	0.0
Assets	24.4	38.0
Purchases of property, plant and equipment	1.9	4.6	6.7
Gathering and Processing Segment \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	835.8	946.7	1,688.2
Intersegment Revenues	175.0	192.4	134.5
Costs of product/services sold	526.1	767.0	1,480.8
Operations and maintenance	98.7	71.7	68.4
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	(6.2)	(3.0)	(14.4)
Goodwill impairment			0.0
Loss on contingent consideration			0.0
Gain on acquisition	209.4
Earnings from unconsolidated affiliates, net	(2.1)	22.5	18.9
Other income, net	0.0	0.0	0.8
EBITDA	587.1	319.9	278.8
Goodwill	126.2	45.9
Assets	3,715.3	2,633.4
Purchases of property, plant and equipment	447.7	294.7	162.7
Gathering and Processing Segment \| Operating Segments \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	835.8	946.7	1,688.2
Intersegment Revenues	175.0	192.4	134.5
Costs of product/services sold	526.1	767.0	1,480.8
Operations and maintenance	98.7	71.7	68.4
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	(6.2)	(3.0)	(14.4)
Goodwill impairment			0.0
Loss on contingent consideration			0.0
Gain on acquisition	209.4
Earnings from unconsolidated affiliates, net	(2.1)	22.5	18.9
Other income, net	0.0		0.8
EBITDA	587.1	319.9	278.8
Goodwill	126.2	45.9
Assets	3,874.7	2,807.1
Purchases of property, plant and equipment	447.7	294.7	162.7
Storage and Transportation \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	20.4	17.1	37.2
Intersegment Revenues	14.2	10.5	6.7
Costs of product/services sold	0.2	0.2	0.3
Operations and maintenance	4.0	3.3	4.2
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	0.0	0.0	0.0
Goodwill impairment			0.0
Loss on contingent consideration			(57.0)
Gain on acquisition	0.0
Earnings from unconsolidated affiliates, net	34.9	30.8	28.9
Other income, net	0.0	0.0	0.0
EBITDA	65.3	54.9	11.3
Goodwill	0.0	0.0
Assets	980.2	1,004.4
Purchases of property, plant and equipment	0.1	0.6	1.3
Storage and Transportation \| Operating Segments \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	20.4	17.1	37.2
Intersegment Revenues	14.2	10.5	6.7
Costs of product/services sold	0.2	0.2	0.3
Operations and maintenance	4.0	3.3	4.2
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	0.0	0.0	0.0
Goodwill impairment			0.0
Loss on contingent consideration			(57.0)
Gain on acquisition	0.0
Earnings from unconsolidated affiliates, net	34.9	30.8	28.9
Other income, net	0.0		0.0
EBITDA	65.3	54.9	11.3
Goodwill	0.0	0.0
Assets	980.2	1,004.4
Purchases of property, plant and equipment	0.1	0.6	1.3
Marketing Supply and Logistics
Segment Reporting Information [Line Items]
Operating revenues		2,690.3
Marketing Supply and Logistics \| Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	2,325.7	2,690.3	2,155.5
Intersegment Revenues	(189.2)	(202.9)	(141.2)
Costs of product/services sold	2,018.6	2,362.2	1,893.6
Operations and maintenance	36.1	50.8	63.4
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	(0.2)	(27.3)	(48.2)
Goodwill impairment			(38.8)
Loss on contingent consideration			0.0
Gain on acquisition	0.0
Earnings from unconsolidated affiliates, net	0.0	0.0	0.0
Other income, net	0.0	0.0	0.0
EBITDA	81.6	47.1	(29.7)
Goodwill	92.7	92.7
Assets	624.7	612.5
Purchases of property, plant and equipment	5.8	5.6	17.7
Marketing Supply and Logistics \| Operating Segments \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	2,325.7	2,690.3	2,155.5
Intersegment Revenues	(189.2)	(202.9)	(141.2)
Costs of product/services sold	2,018.6	2,362.2	1,893.6
Operations and maintenance	36.1	50.8	63.4
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	(0.2)	(27.3)	(48.2)
Goodwill impairment			(38.8)
Loss on contingent consideration			0.0
Gain on acquisition	0.0
Earnings from unconsolidated affiliates, net	0.0	0.0	0.0
Other income, net	0.0		0.0
EBITDA	81.6	47.1	(29.7)
Goodwill	92.7	92.7
Assets	624.7	612.5
Purchases of property, plant and equipment	$ 5.8	$ 5.6	$ 17.7

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