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Commitments and Contingencies, Liquidity Option Agreement (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Liquidity Option Agreement [Abstract] |  |
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 | 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 | $ 27.2 |
Liquidity Option Agreement [Member] | Minimum [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Fair value inputs, Expected life of OTA following option exercise | 1 year |
Liquidity Option Agreement [Member] | Maximum [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Fair value inputs, Expected life of OTA following option exercise | 30 years |
Liquidity Option Agreement [Member] | Measurement Input, EBITDA Multiple [Member] | Minimum [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.021 |
Liquidity Option Agreement [Member] | Measurement Input, EBITDA Multiple [Member] | Maximum [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.072 |
Liquidity Option Agreement [Member] | Measurement Input, Ownership Interest in Units [Member] | Minimum [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.018 |
Liquidity Option Agreement [Member] | Measurement Input, Ownership Interest in Units [Member] | Maximum [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.025 |
Liquidity Option Agreement [Member] | Measurement Input, Aggregate Tax Rate [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.24 |
Liquidity Option Agreement [Member] | Measurement Input, Discount Rate [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.079 |
Liquidity Option Agreement [Member] | Measurement Input, Unit Retention Percentage [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability, Measurement Input | 0.930 |
Valuation, Income Approach [Member] | Liquidity Option Agreement [Member] |  |
Liquidity Option Agreement [Abstract] |  |
Derivative Liability | $ 368.8 | $ 333.9

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