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Business Segments (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2016 USD ($) Segment | Mar. 31, 2015 USD ($)
Business Segments [Abstract] |  |
Number of reportable segments | Segment | 5 |
Segment Gross Operating Margin [Abstract] |  |
Revenues | $ 5,005.3 | $ 7,472.5
Subtract operating costs and expenses | (4,146.9) | (6,616.4)
Add equity in income of unconsolidated affiliates | 101.1 | 89.2
Add depreciation, amortization and accretion expense amounts not reflected in gross operating margin | 358.2 | 345.3
Add impairment charges not reflected in gross operating margin | 1.7 | 33.3
Add net losses or subtract net gains attributable to asset sales not reflected in gross operating margin | 4.9 | (0.1)
Add non-refundable deferred revenues attributable to shipper make-up rights on major new pipeline projects reflected in gross operating margin | 7.1 | 30.7
Subtract subsequent recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin | (12.9) | (20.1)
Total segment gross operating margin | 1,318.5 | 1,334.4
Reconciliation of total Segment Gross Operating Margin [Abstract] |  |
Total segment gross operating margin | 1,318.5 | 1,334.4
Adjustments to reconcile total segment gross operating margin to operating income: |  |
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin | (358.2) | (345.3)
Subtract impairment charges not reflected in gross operating margin | (1.7) | (33.3)
Add net gains or subtract net losses attributable to asset sales not reflected in gross operating margin | (4.9) | 0.1
Subtract non-refundable deferred revenues attributable to shipper make-up rights on major new pipeline projects reflected in gross operating margin | (7.1) | (30.7)
Add subsequent recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin | 12.9 | 20.1
Subtract general and administrative costs not reflected in gross operating margin | (43.9) | (49.3)
Operating income | 915.6 | 896.0
Other expense, net | (237.0) | (238.6)
Income before income taxes | $ 678.6 | $ 657.4

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- Definition Operating income before: (i) depreciation, amortization and accretion expense; (ii) non-cash consolidated asset impairment charges; (iii) operating lease expenses for which the entity does not have the payment obligation; (iv) gains and losses from asset sales and related transactions and (v) general and administrative costs. + References No definition available. + Details
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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