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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
May 15, 2018 | Feb. 14, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Series A Preferred Units |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distribution of units in lieu of cash (units) |  |  | 1,393,926 | 1,287,773
Series B Preferred Units |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions payable |  |  | $ 18.0 |
In-Kind Unit Distribution | Series A Preferred Units |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distribution of units in lieu of cash (units) |  | 1,393,926 |  |
Preferred unit distribution amount |  | $ 37.0 |  |
Forecast | Cash Distributions | Series A Preferred Units |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Preferred unit distribution amount | $ 37.0 |  |  |
Preferred distributions per unit (in dollars per unit) | $ 0.525 |  |  |
Forecast | Cash Distributions | Series B Preferred Units |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Preferred unit distribution amount | $ 24.5 |  |  |
Preferred distributions per unit (in dollars per unit) | $ 30.625 |  |  |

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