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Commitments (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of future cash outflows not reflected in measurement of lease liability and purchase obligations [line items]    
Variable lease payments $ 291.2  
Short-term and low value lease payments 2.8  
Leases not commenced but committed 33.3  
Total minimum lease payments 327.3  
Future minimum payments receivable under non-cancelable sublease agreements 7.2 $ 7.9
Sublease receivables 3.0 $ 2.1
Less than 1 Year    
Disclosure of future cash outflows not reflected in measurement of lease liability and purchase obligations [line items]    
Variable lease payments 50.6  
Short-term and low value lease payments 2.2  
Leases not commenced but committed 1.5  
Total minimum lease payments 54.3  
1 to 3 Years    
Disclosure of future cash outflows not reflected in measurement of lease liability and purchase obligations [line items]    
Variable lease payments 79.4  
Short-term and low value lease payments 0.6  
Leases not commenced but committed 6.1  
Total minimum lease payments 86.1  
After 3 Years    
Disclosure of future cash outflows not reflected in measurement of lease liability and purchase obligations [line items]    
Variable lease payments 161.2  
Short-term and low value lease payments 0.0  
Leases not commenced but committed 25.7  
Total minimum lease payments $ 186.9