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

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

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The expected ownership interests in company (in hundredths), used as an input to measure fair value.

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The expected partnership growth rate (in hundredths), used as an input to measure fair value.

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Number of days commencing February 1, 2020 that M&B can exercise the liquidity option agreement.

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Number of Enterprise Common Units Held at Exercise Date by OTA.

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Percentage of OTA capital stock we agreed to purchase from M&B under liquidity option agreement.

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Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Value of input used to measure derivative liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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