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Commitments and Contingencies, Liquidity Option Agreement (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |  |
Federal corporate tax rate (in hundredths) |  | 35.00% |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Change in fair value of Liquidity Option Agreement |  | $ 64.3 | $ 24.5 | $ 25.4
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 |  |
Liquidity Option Agreement [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Increase in fair value of liquidity option agreement due to Tax Cuts and Jobs Act |  | $ 21.2 |  |
Increase in fair value of liquidity option agreement assuming retention of all units |  | 40.2 |  |
Plan [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal corporate tax rate (in hundredths) | 21.00% |  |  |
Level 3 [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Liquidity option agreement |  | $ 333.9 | $ 269.6 |
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, federal and state tax rate |  | 24.00% |  |
Cash flow projections discount rate |  | 7.60% |  |
Fair value inputs, weighted-average expected ownership percentage of contributed units at beginning of option period |  | 89.00% |  |
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 |  | 2.10% |  |
Fair value inputs, OTA ownership interest in Enterprise common units |  | 1.80% |  |
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 |  | 7.20% |  |
Fair value inputs, OTA ownership interest in Enterprise common units |  | 2.50% |  |

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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 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 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 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 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 domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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