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Equity - Public Offering (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 29, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]        
Consideration for units issued in connection with private placement   $ 0.0 $ 8.7  
Aggregate percentage of general partner interest   2.00%    
Shell Treasury Center West Inc | Five Year Revolver        
Class of Stock [Line Items]        
Debt instrument term   5 years    
Shell Treasury Center West Inc | 364 Day Revolver        
Class of Stock [Line Items]        
Debt instrument term   364 days   364 days
General Partner        
Class of Stock [Line Items]        
Units issued in connection with public offering (in units) 258,163      
Consideration for units issued in connection with private placement $ 8.2   $ 0.5  
Aggregate percentage of general partner interest 2.00% 2.00% 2.00%  
General Public | Common Units        
Class of Stock [Line Items]        
Units issued in connection with public offering (in units) 12,650,000      
Net proceeds from public offering $ 395.1      
Gross proceeds from public offering $ 401.6      
Common units per share (in units per share) $ 31.75   $ 34.00  
Underwriter fees $ 6.3      
Placement fees $ 0.2   $ 0.1