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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 No definition available. + Details
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- Definition Expense associated with the change in fair value of the Liquidity Option Agreement. + References No definition available. + Details
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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 -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1500-128463 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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