Equity and Distributions, Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 02, 2014
Components of noncontrolling interests
Limited partners of Oiltanking other than EPO	$ 1,408.9	$ 0
Joint venture partners	220.1us-gaap_MinorityInterestInJointVentures	225.6us-gaap_MinorityInterestInJointVentures
Total	1,629.0	225.6
Components of net income attributable to noncontrolling interests
Limited partners of Oiltanking other than EPO	14.2	0	0
Joint venture partners	31.9	10.2	8.1
Total	46.1	10.2	8.1
Cash distributions paid to noncontrolling interests:
Limited partners of Oiltanking other than EPO	7.7	0	0
Joint venture partners	40.9	8.9	13.3
Total	48.6	8.9	13.3
Cash contributions from noncontrolling interests:
Joint venture partners	4.0	115.4	6.6
Oiltanking Partners L.P. [Member]
Components of noncontrolling interests
Limited partners of Oiltanking other than EPO				1,400.0
Enterprise EF78 LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Parent	75.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%
Initial contribution from joint venture partner		$ 90.2

Amount of cash contributions to our consolidated joint ventures by third party ownership interests.

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Amount of cash distributions made by our consolidated joint ventures to third party ownership interests.

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Amount of cash distributions made by our publicly traded subsidiary to third party and related party shareholders.

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Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

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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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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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Amount after tax of income (loss) attributable to nonredeemable noncontrolling shareholder, unit holder, partner, or other equity holder of a joint venture.

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Amount after tax of income (loss) attributable to nonredeemable noncontrolling partner of a limited partnership.

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Total of all Partners' Capital (deficit) items which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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