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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