Commitments and Contingencies, Liquidity Option Agreement (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Liquidity Option Agreement [Abstract]
Liquidity Option Agreement	$ 350.3	$ 333.9
Percentage of capital stock we agreed to purchase under liquidity option agreement	100.00%
Liquidity Option exercise period	90 days
Number of units held by limited partner	54,807,352
Liquidity Option Agreement [Member]
Liquidity Option Agreement [Abstract]
Fair value inputs, federal and state tax rate	24.00%
Cash flow projections discount rate	8.00%
Fair value inputs, weighted-average expected ownership percentage of contributed units at beginning of option period	92.00%
Increase in fair value of liquidity option agreement assuming retention of all units	$ 31.1
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%
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%

Amount related to the option to purchase 100% of the issued and outstanding capital stock of the acquired entity.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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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.

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- Definition

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

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No definition available.

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- Definition

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

+ References

No definition available.

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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

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

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