Leases (Narrative) (Details)	3 Months Ended
	Mar. 30, 2019
Operating Leased Assets [Line Items]
Right-of-Use Asset for which lease had not commenced	As at March 30, 2019, the Company had commitments for approximately $15 million of right-of-use assets for which the leases had not commenced.
Minimum
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Term of Contract	15 years
Maximum | Real estate operating leases
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Renewal Term	10 years