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Employee Future Benefits (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
CAD ($)
year
Dec. 31, 2018
CAD ($)
age
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Disclosure of defined benefit plans [line items]            
Administration expenses $ 1.0       $ 2.0 $ 2.0
Weighted average duration of defined benefit obligation | year     14      
Minimum            
Disclosure of defined benefit plans [line items]            
Employer contribution (as percent)   500.00%        
Maximum            
Disclosure of defined benefit plans [line items]            
Employer contribution (as percent)   1000.00%        
Registered Pension Plan            
Disclosure of defined benefit plans [line items]            
Administration expenses 1.0       2.0 2.0
Registered Pension Plan | Letter of credit            
Disclosure of defined benefit plans [line items]            
Letter of credit, posted 80.0 $ 80.0 $ 80.0 $ 80.0    
Supplemental Pension Plan            
Disclosure of defined benefit plans [line items]            
Administration expenses 0.0       0.0 0.0
Other Post-Employment Benefit Plans            
Disclosure of defined benefit plans [line items]            
Maximum age disabled and retired members eligible for benefits   65   65    
Administration expenses 0.0       0.0 $ 0.0
Related parties [member] | Registered Pension Plan            
Disclosure of defined benefit plans [line items]            
Administration expenses $ 0.1       $ 0.1