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Leases (Narrative) (Details)
6 Months Ended
Jun. 29, 2019
Operating Leased Assets [Line Items]  
Right-of-Use Asset for which lease had not commenced As at June 29, 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
Real estate operating leases  
Operating Leased Assets [Line Items]  
Lessee, Operating Lease, Renewal Term 10 years