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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
May 15, 2019
Feb. 14, 2019
Mar. 31, 2019
Cash Distribution | 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 Distribution | 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 Distribution | 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    
Other current liabilities | Series B Preferred Units      
Partners Capital and Distribution [Line Items]      
Amount accrued to distributions payable     $ 18.0