The percentage of additional interest acquired by the entity.

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The percentage of additional interest acquired by the entity.

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No definition available.

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The percentage of joint funding arrangement non-controlling interest.

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Represents the percentage of parent entity's funding in a joint funding arrangement

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No definition available.

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The percentage of option to increase general partnership interest percentage.

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No definition available.

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The percentage of ownership interest in affiliate of Partnership.

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Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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RELATED PARTY TRANSACTIONS (Joint Funding Arrangement Discussions) (Details) - USD ($) $ in Millions			1 Months Ended		3 Months Ended		9 Months Ended
	Apr. 27, 2017	Jan. 26, 2017	Apr. 27, 2017	Jan. 26, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive income (loss) attributable to noncontrolling interests					$ 102.9	$ (191.9)	$ 261.8	$ (52.8)
Acquisition of noncontrolling interest in subsidiary							360.0
Proceeds from noncontrolling interests							1,390.3	62.4
Noncontrolling Interest [Member]
Comprehensive income (loss) attributable to noncontrolling interests							(261.8)	52.8
Distribution payable							376.0	125.2
Increase from sale of parent equity interest							411.0	0.0
Line 3 Replacement [Member]
Joint funding arrangement, parent (in percent)		99.00%		99.00%
Joint funding arrangement noncontrolling interest (in percentage)				1.00%
Option to increase general partnership interest percentage (in percentage)				40.00%
Consideration transferred				$ 450.1			185.0
Increase from sale of parent equity interest		$ 411.0		411.0
Acquisition of noncontrolling interest in subsidiary							39.1
Bakken Pipeline Systems [Member]
Noncontrolling interest, ownership percentage by parent (in percent)	75.00%		75.00%
Ownership interest in affiliate of Partnership (in percentage)			25.00%
Additional acquisitions percentages			20.00%
Comprehensive income (loss) attributable to noncontrolling interests							(21.7)
Consideration transferred							420.0
Bakken Pipeline Systems [Member] \| Noncontrolling Interest [Member]
Distribution payable							(28.1)
Eastern Access Pipeline [Member]
Consideration transferred							$ 8.5	7.2
Acquisition of noncontrolling interest in subsidiary				$ 360.0
Additional acquisition percentages				15.00%
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest				25.00%			40.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest				75.00%			60.00%
US Mainline Expansion Interests [Member]
Noncontrolling interest, ownership percentage by parent (in percent)					75.00%		75.00%
Ownership interest in affiliate of Partnership (in percentage)							25.00%
Additional acquisition percentages							15.00%
Proceeds from noncontrolling interests							$ 27.3	58.5
General Partner [Member]
Noncontrolling interest, ownership percentage by parent (in percent)					75.00%		75.00%
Proceeds from related party debt			$ 1,140.0
Distribution payable							$ 9.5	12.9
Consideration transferred							92.1	0.0
Increase from sale of parent equity interest							$ 0.8	$ 0.0
Proceeds from noncontrolling interests	$ 1,140.0