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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | $ 63.4 | $ 27.8 | $ 8.4
Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 2.6 |  |
Carrying value prior to impairment | 4.8 |  |
Long-lived Assets Held and Used [Member] | Spare Parts Inventory [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges |  | 11.1 |
Carrying value prior to impairment |  | 13.8 |
Long-lived Assets Disposed of By Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 4.3 |  |
Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 56.5 | 16.4 |
Long-lived Assets Disposed of Other Than By Sale [Member] | Texas Intrastate System [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 29.2 | 5.1 | 3.7
Long-lived Assets Disposed of Other Than By Sale [Member] | Texas Crude Oil Pipelines [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 10.6 |  |
Long-lived Assets Disposed of Other Than By Sale [Member] | Hobbs Facility [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges |  |  | 2.6
Long-lived Assets Disposed of Other Than By Sale [Member] | Underground and other storage facilities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges |  | 9.1 |
Long-lived Assets Disposed of Other Than By Sale [Member] | Yscloskey Natural Gas Processing Plant [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 5.7 |  |
NGL Pipelines and Services [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 16.3 | 11.3 | 2.8
Onshore Natural Gas Pipelines And Services [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 29.2 | 10.4 | 5.2
Onshore Crude Oil Pipelines and Services [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 10.6 | 0 | 0
Offshore Pipelines And Services [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 4.0 | 5.5 | 0
Petrochemical and Refined Products Services [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Non-cash asset impairment charges | 3.3 | 0.6 | 0.4
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 2.2 |  |
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 0.8 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 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 |  |
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 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 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 |  |
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 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 2.2 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held and Used [Member] | Spare Parts Inventory [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value |  | 2.7 |
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 |  |
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 | $ 0.8 |  |

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- Definition Carrying value prior to impairment charges. + References No definition available. + Details
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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3602-108585 Reference 4: 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 This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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=7578670&loc=d3e19207-110258 + Details
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