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Property, Plant and Equipment (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization $ (413.1) $ (330.7)  
Property, plant and equipment, net excluding nondepreciable assets 966.9 698.1  
Property, plant and equipment, net 981.3 988.4  
Depreciation and amortization 82.6 71.7 $ 64.2
Tanks and Station equipment (primarily storage of crude oil and other refined products) [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 1,040.9 703.4  
Tanks and Station equipment (primarily storage of crude oil and other refined products) [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 5 years    
Tanks and Station equipment (primarily storage of crude oil and other refined products) [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 40 years    
Pipelines (primarily transportation of crude oil and other refined products) [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 143.7 151.9  
Pipelines (primarily transportation of crude oil and other refined products) [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 30 years    
Pipelines (primarily transportation of crude oil and other refined products) [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 64 years    
Other [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 195.4 173.5  
Other [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 5 years    
Other [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 35 years    
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 0.3 0.1  
Construction work in process [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 14.1 $ 290.2