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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 09, 2016
Jun. 09, 2016
May 23, 2016
Mar. 29, 2016
Jul. 01, 2015
May 18, 2015
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Nov. 17, 2015
Business Acquisition [Line Items]                    
Units issued in connection with public offering (in units)               25,229,591    
Contributions from general partner               $ 9.8 $ 6.1 [1]  
Aggregate percentage of general partner interest               2.00%    
Capital distributions to general partner, cash               $ 599.2 712.1 [1]  
Other non-cash capital distributions to Parent               7.1 0.0 [1]  
Net proceeds from private placement               $ 0.0 297.7 [1]  
Shell Treasury Center West Inc | Five Year Revolver                    
Business Acquisition [Line Items]                    
Debt instrument term               5 years    
Common Units                    
Business Acquisition [Line Items]                    
Net proceeds from private placement           $ 297.7        
General Partner                    
Business Acquisition [Line Items]                    
Units issued in connection with public offering (in units)   32,143   258,163       504,591    
Contributions from general partner   $ 1.1   $ 8.2   $ 6.1 $ 0.5      
Aggregate percentage of general partner interest       2.00%   2.00% 2.00% 2.00%    
Explorer                    
Business Acquisition [Line Items]                    
Interest acquired               2.62%    
Minority interest ownership percentage by parent 35.97%                  
August 2016 Acquisition                    
Business Acquisition [Line Items]                    
Interest acquired 2.62%                  
Consideration transferred $ 26.2                  
Consideration, cash on hand 26.3                  
Transaction costs $ 0.1                  
Zydeco                    
Business Acquisition [Line Items]                    
Interest acquired     30.00%     19.50%        
Bengal                    
Business Acquisition [Line Items]                    
Interest acquired     1.00%              
Colonial                    
Business Acquisition [Line Items]                    
Interest acquired     3.00%     1.388%        
May 2016 Acquisition                    
Business Acquisition [Line Items]                    
Consideration transferred     $ 700.0              
Consideration, cash on hand     50.4              
Transaction costs     0.4              
Capital distributions to general partner     606.3              
Capital distributions to general partner, cash     599.2              
Other non-cash capital distributions to Parent     7.1              
Book value of assets acquired     93.7              
May 2016 Acquisition | Shell Treasury Center West Inc | Five Year Revolver                    
Business Acquisition [Line Items]                    
Consideration, funded with borrowings     $ 296.7              
Debt instrument term     5 years              
May 2016 Acquisition | Common Units                    
Business Acquisition [Line Items]                    
Net proceeds from public offering     $ 345.8              
Units issued in connection with public offering (in units)     10,500,000              
May 2016 Acquisition | General Partner                    
Business Acquisition [Line Items]                    
Units issued in connection with public offering (in units)     214,285              
Contributions from general partner     $ 7.1              
Aggregate percentage of general partner interest     2.00%              
May 2015 Acquisition                    
Business Acquisition [Line Items]                    
Consideration transferred           $ 448.0        
Consideration, cash on hand           80.0        
Transaction costs           0.5        
Consideration, funded with borrowings           70.8        
Capital distributions to general partner           392.6        
Book value of assets acquired           $ 55.4        
May 2015 Acquisition | Shell Treasury Center West Inc | Five Year Revolver                    
Business Acquisition [Line Items]                    
Debt instrument term           5 years        
May 2015 Acquisition | Common Units                    
Business Acquisition [Line Items]                    
Net proceeds from private placement           $ 297.7        
Poseidon                    
Business Acquisition [Line Items]                    
Interest acquired         36.00%          
Consideration, cash on hand         $ 350.0          
Capital distributions to general partner         319.5          
Book value of assets acquired         $ 30.5          
Pecten                    
Business Acquisition [Line Items]                    
Interest acquired                   100.00%
Contributions from general partner                 6.1  
Capital distributions to general partner, cash                 712.1  
Net proceeds from private placement                 $ 297.7  
[1] (1) The 2015 financial information has been retrospectively adjusted for the acquisition of the Shell Auger and Lockport Operations.