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Commitments and Contingencies, Liquidity Option Agreement (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |
Limited partner interests of Oiltanking acquired |  |  |  | 65.90%
Number of units held by limited partner (in units) | shares | 54,807,352 |  |  |
Deferred tax liability | $ 103.5 | $ 83.1 |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Change in fair value of Liquidity Option Agreement | $ 119.6 | 56.1 | $ 64.3 |
Percentage of capital stock agreed to purchase under liquidity option agreement | 100.00% |  |  |
Liquidity Option exercise period | 90 days |  |  |
Level 3 [Member] | Liquidity Option Agreement [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Derivative Liability | $ 509.6 | $ 390.0 |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Minimum [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Fair value inputs, Estimated growth rates in Enterprise earnings before interest, taxes, depreciation and amortization | 0.70% |  |  |
Fair value inputs, OTA ownership interest in Enterprise common units | 2.30% |  |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Maximum [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Fair value inputs, Expected life of OTA following option exercise | 30 years |  |  |
Fair value inputs, Estimated growth rates in Enterprise earnings before interest, taxes, depreciation and amortization | 2.20% |  |  |
Fair value inputs, OTA ownership interest in Enterprise common units | 2.50% |  |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Measurement Input, Aggregate Tax Rate [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Derivative Liability, Measurement Input | 0.228 |  |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Measurement Input, Discount Rate [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Derivative Liability, Measurement Input | 0.057 |  |  |

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