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Commitments and Contingencies, Liquidity Option Agreement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Oct. 02, 2014
Liquidity Option Agreement [Abstract]
Liquidity Option Agreement	$ 235.5		$ 235.5		$ 219.7	$ 119.4
Business Acquisition [Line Items]
Purchase price adjustment to goodwill			1,454.1
Change in fair value of Liquidity Option Agreement (see Note 15)	$ 4.3	$ 0.0	$ 15.8	$ 0.0
Liquidity Option Agreement [Member] | Maximum [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair value inputs, Expected life of OTA following option exercise (in years)			30 years
Liquidity Option Agreement [Member] | Minimum [Member]
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Fair value inputs, Expected life of OTA following option exercise (in years)			1 year
Oiltanking Partners L.P. - Step 1 [Member]
Business Acquisition [Line Items]
Liquidity Option Agreement valuation adjustment					100.3
Purchase price adjustment to goodwill					$ 100.3

X

- Definition

Amount related to the option to purchase 100% of the issued and outstanding capital stock of the acquired entity.

+ References

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- Definition

Expense associated with the change in fair value of the Liquidity Option Agreement.

+ References

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- Definition

The expected business terms (in years), used as an input to measure fair value.

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial liabilities assumed in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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