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Commitments and Contingencies, Liquidity Option Agreement (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Liquidity Option Agreement [Abstract] |  |  |
Change in fair value of Liquidity Option Agreement | $ 24.5 | $ 25.4 | $ 0.0
Percentage of capital stock we agreed to purchase under liquidity option agreement | 100.00% |  |
Liquidity Option exercise period | 90 days |  |
Percentage of fair market value of Enterprise units to be paid as consideration | 100.00% |  |
Trigger Event exercise period | 135 days |  |
Number of units held by limited partner (in units) | 54,807,352 |  |
Level 3 [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Liquidity option agreement | $ 269.6 | $ 245.1 |
Level 3 [Member] | Liquidity Option Agreement [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Fair value inputs, Assumed long-term debt | $ 2,200.0 |  |
Fair value inputs, Interest rate on assumed debt of OTA following option exercise | 4.63% |  |
Fair value inputs, Life of debt assumed after Liquidity option is exercised | 30 years |  |
Increase in fair value of liquidity option agreement if debt excluded from valuation model | $ 215.8 |  |
Fair value inputs, federal and state tax rate | 38.00% |  |
Decrease in fair value of liquidity option agreement assuming a 5% lower tax rate | $ (35.5) |  |
Cash flow projections discount rate | 7.60% |  |
Fair value inputs, weighted-average expected ownership percentage of contributed units at beginning of option period | 84.00% |  |
Increase in fair value of liquidity option agreement assuming retention of all units | $ 50.9 |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Minimum [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Fair value inputs, Expected life of OTA following option exercise | 1 year |  |
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 | 1.90% |  |
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 | 14.70% |  |
Fair value inputs, OTA ownership interest in Enterprise common units | 2.60% |  |

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- 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 Change in fair value of liquidity option agreement assuming a change in tax rate. + References No definition available. + Details
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- Definition Expense (benefit) associated with the change in fair value of the Liquidity Option Agreement. + References No definition available. + Details
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- Definition The assumed long-term debt, used as an input to measure fair value. + References No definition available. + Details
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- Definition The federal and state tax rate (in hundredths), used as an input to measure fair value. + References No definition available. + Details
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- Definition The expected interest rate on debt allocated post-option exercise, used as an input to measure fair value. + References No definition available. + Details
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- Definition The expected life of debt assumed in connection with the exercised of the Liquidity Option. + References No definition available. + Details
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- Definition The weighted-average expected ownership percentage of contributed units at beginning of option period (in hundredths), used as an input to measure fair value. + References No definition available. + Details
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- Definition Increase in fair value of liquidity option agreement in valuation model if all units are retained. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Number of days commencing February 1, 2020 that M&B can exercise the liquidity option agreement. + References No definition available. + Details
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- Definition Number of Enterprise Common Units Held at Exercise Date by OTA. + References No definition available. + Details
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- Definition Percentage of OTA capital stock we agreed to purchase from M&B under liquidity option agreement. + References No definition available. + Details
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- Definition Percentage of fair market value of Enterprise units to be paid as consideration upon exercise of the liquidity option. + References No definition available. + Details
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- Definition Number of days following a Trigger Event that M&B has to exercise liquidity option. Trigger Events include, among other scenarios, any Enterprise Tax Event (as defined in the underlying agreements) + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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