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Commitments and Contingencies, Liquidity Option Agreement (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Liquidity Option Agreement [Abstract] |  |  |
Change in fair market value of Liquidity Option Agreement | $ 57.8 | $ 7.5 |
Percentage of capital stock we agreed to purchase under liquidity option agreement | 100.00% |  |
Liquidity Option exercise period | 90 days |  |
Percent increase (decrease) in weighted-average cost of capital | (1.00%) |  |
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 | $ 20.1 |  |
Liquidity Option Agreement [Member] | Measurement Input, Unit Retention Percentage [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Derivative Liability, Measurement Input | 0.960 |  |
Valuation, Income Approach [Member] | Liquidity Option Agreement [Member] |  |  |
Liquidity Option Agreement [Abstract] |  |  |
Derivative Liability | $ 447.8 |  | $ 390.0

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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 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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