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Acquisitions (Details)
bbl in Millions
3 Months Ended
Sep. 30, 2016
USD ($)
mi
bbl
Jun. 30, 2017
mi
bbl
Business Acquisition [Line Items]    
Pipeline, Miles | mi   705
Active Storage Capacity | bbl   12.4
St. Paul Park Logistics Assets [Member]    
Business Acquisition [Line Items]    
Pipeline, Miles | mi 2.5  
Payments to Acquire Businesses, Gross | $ $ 195,000,000  
Common Units [Member] | St. Paul Park Logistics Assets [Member]    
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ $ 628,224  
Crude Oil Storage Tanks [Member] | St. Paul Park Logistics Assets [Member]    
Business Acquisition [Line Items]    
Active Storage Capacity | bbl 4.0  
Pipelines and related assets | St. Paul Park Logistics Assets [Member]    
Business Acquisition [Line Items]    
Pipeline Segments 2  
Pipelines, Inactive [Member] | St. Paul Park Logistics Assets [Member]    
Business Acquisition [Line Items]    
Pipeline Segments 1