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Commitments and Contingencies, Liquidity Option Agreement (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Liquidity Option Agreement [Abstract] |  |  |
Change in fair value of Liquidity Option Agreement | $ 56.1 | $ 64.3 | $ 24.5
Percentage of capital stock 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) | shares | 54,807,352 |  |
Liquidity Option Agreement [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Increase in fair value of liquidity option agreement assuming retention of all units | $ 23.1 |  |
Level 3 [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Derivative Liability | $ 390.0 | $ 333.9 |
Level 3 [Member] | Liquidity Option Agreement [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Fair value inputs, Life of debt assumed after Liquidity option is exercised | 30 years |  |
Fair value inputs, weighted-average expected ownership percentage of contributed units at beginning of option period | 94.00% |  |
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 | 1.90% |  |
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 | 5.60% |  |
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 | 0.24 |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Measurement Input, Discount Rate [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Derivative Liability, Measurement Input | 0.079 |  |

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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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- 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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