EQUITY INVESTMENTS IN JOINT VENTURES (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
Feb. 15, 2017	Jun. 30, 2017	Jun. 30, 2016
Reduction To Equity Earnings		$ 2.9
Income (Loss) from Equity Method Investments		$ 6.4	$ 0.0
Bakken Pipeline System [Member]
Noncontrolling Interest, Ownership Percentage by Parent	75.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	27.60%
Business Combination, Consideration Transferred	$ 1,500.0
Goodwill	14.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 931.4
MarEn Bakken Company LLC [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%

Amount which reported as a reduction in equity earnings during the year.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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

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