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Employee Future Benefits (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
age
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
CAD ($)
year
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Disclosure of defined benefit plans [line items]            
Administration expenses   $ 2.0     $ 1.0 $ 2.0
Weighted average duration of defined benefit obligation | year     15.6      
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            
Disclosure of defined benefit plans [line items]            
Administration expenses   2.0     1.0 2.0
Registered | Letter of credit            
Disclosure of defined benefit plans [line items]            
Letter of credit, posted $ 83.0 83.0 $ 83.0 $ 83.0    
Registered | Related parties [member]            
Disclosure of defined benefit plans [line items]            
Administration expenses   0.0     0.1  
Supplemental Pension Plan            
Disclosure of defined benefit plans [line items]            
Administration expenses   0.0     0.0 0.0
Other            
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