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Business Segments (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($) Segment | Mar. 31, 2017 USD ($)
Business Segments [Abstract] |  |  |
Number of reportable segments | Segment |  | 4 |
Segment Gross Operating Margin [Abstract] |  |  |
Operating income |  | $ 1,138.5 | $ 1,031.6
Adjustments to reconcile operating income to total gross operating margin: |  |  |
Add depreciation, amortization and accretion expense in operating costs and expenses |  | 394.3 | 376.2
Add asset impairment and related charges in operating costs and expenses |  | 0.9 | 11.2
Add net gains attributable to asset sales in operating costs and expenses |  | (0.5) | (0.3)
Add general and administrative costs |  | 53.0 | 50.4
Adjustments for make-up rights on certain new pipeline projects: |  |  |
Add non-refundable payments received from shippers attributable to make-up rights | [1] | 2.7 | 13.3
Subtract the subsequent recognition of revenues attributable to make-up rights | [2] | (14.2) | (9.1)
Total segment gross operating margin |  | $ 1,574.7 | $ 1,473.3
[1] | Since make-up rights entail a future performance obligation by the pipeline to the shipper, these receipts are recorded as deferred revenue for GAAP purposes; however, these receipts are included in gross operating margin in the period of receipt since they are nonrefundable to the shipper.
[2] | As deferred revenues attributable to make-up rights are subsequently recognized as revenue under GAAP, gross operating margin must be adjusted to remove such amounts to prevent duplication since the associated non-refundable payments were previously included in gross operating margin.

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- Definition The amount of expense recognized and charged to operating costs and expenses in the current period that reflects the allocation of the cost of assets over the assets' useful lives excluded from gross operating margin. + References No definition available. + Details
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- Definition The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss) recorded in operating costs and expenses excluded from gross operating margin. + References No definition available. + 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 No definition available. + Details
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- Definition Revenue related to make-up rights recognized during period. Amounts were previously deferred and included in gross operating margin. + References No definition available. + Details
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- Definition Non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects included in gross operating margin. + References No definition available. + Details
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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=63488584&loc=d3e20235-122688 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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