Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 CAD ($)
Lessee, Lease, Description [Line Items]
Lessee, Operating lease, Option to extend	10 years
Lessee, Operating lease, Option to terminate	one year
Operating lease, Residual value guarantee	$ 1
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating lease, Term of contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating lease, Term of contract	14 years