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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Asset Impairment Charges [Abstract] |  |  |  |
Non-cash asset impairment charges | $ 5.7 | $ 15.2 | $ 18.2 | $ 53.3
Impairment of long-lived assets disposed of other than by sale |  |  | 11.7 | 43.3
Impairment of long-lived assets held and used |  |  |  | 4.2
Impairment of long-lived assets to be disposed of by sale |  |  | 6.5 | 5.8
NGL Pipelines and Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Non-cash asset impairment charges | 1.2 | 0.3 | 6.6 | 10.0
Onshore Natural Gas Pipelines and Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Non-cash asset impairment charges | 0.4 | 0 | 0.7 | 0
Onshore Crude Oil Pipelines and Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Non-cash asset impairment charges | 0.4 | 0 | 2.2 | 16.6
Offshore Pipelines And Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Non-cash asset impairment charges | 0 | 13.2 | 0 | 13.2
Petrochemical and Refined Products Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Non-cash asset impairment charges | 3.7 | 1.7 | 8.7 | 13.5
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
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value |  | 6.1 |  | 6.1
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 1.1 | 11.7 | 1.1 | 11.7
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
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value |  | 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 | 11.7 | 0 | 11.7
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
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value |  | 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 | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value |  | 6.1 |  | 6.1
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | $ 1.1 | $ 0 | $ 1.1 | $ 0

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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