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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges		$ 26.8	$ 5.7	$ 139.1	$ 18.2
Impairment of long-lived assets disposed of other than by sale				69.9	11.7
Impairment of long-lived assets held for sale				14.2	6.5
Impairment of long-lived assets disposed of by sale	[1]			55.0
Offshore Business [Member]
Asset Impairment Charges [Abstract]
Impairment of long-lived assets disposed of by sale				54.8
NGL Pipelines and Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges		14.6	1.2	20.6	6.6
Crude Oil Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges		0.0	0.4	25.9	2.2
Natural Gas Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges		0.0	0.4	21.5	0.7
Petrochemical & Refined Products Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges		12.2	3.7	12.6	8.7
Offshore Pipelines And Services [Member]
Asset Impairment Charges [Abstract]
Non-cash asset impairment charges		0.0	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		0.4	0.0	0.4	0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held For Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value		34.2	1.1	34.2	1.1
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value		0.0		0.0
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 Held For 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		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 Held For 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		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		0.4	0.0	0.4	0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held For Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value		34.2	$ 1.1	34.2	$ 1.1
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, fair value		$ 0.0		$ 0.0
[1] Primarily represents the impairment charge recorded in second quarter of 2015 upon reclassification of our Offshore Business to held for sale status.

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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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