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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - Portion at Fair Value Measurement [Member] - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges	$ 79.0		$ 3.7	$ 112.3		$ 12.5
Impairment of long-lived assets disposed of other than by sale				55.1		7.5
Impairment of long-lived assets to be disposed of by sale				57.2	[1]	5.0
Offshore Business [Member]
Asset Impairment Charges [Abstract]
Impairment of long-lived assets to be disposed of by sale				54.8
NGL Pipelines and Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges	5.2		2.8	6.0		5.4
Crude Oil Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges	18.1		0.8	25.9		1.8
Natural Gas Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges	0.8		0.1	21.5		0.3
Petrochemical and Refined Products Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges	0.0		0.0	0.4		5.0
Offshore Pipelines And Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges	54.9		0.0	58.5		0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	0.0		0.0	0.0		0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	1,689.4	[1]	0.1	1,689.4	[1]	0.1
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	0.0		0.0	0.0		0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	0.0	[1]	0.0	0.0	[1]	0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	0.0		0.0	0.0		0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	0.0	[1]	0.0	0.0	[1]	0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	0.0		0.0	0.0		0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value	$ 1,689.4	[1]	$ 0.1	$ 1,689.4	[1]	$ 0.1
[1] Primarily includes long-lived assets of our Offshore Business that were reclassified to held for sale at June 30, 2015, net of an associated non-cash impairment charge of $54.8 million related to goodwill. See Note 6.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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