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Recent Accounting Pronouncements and Changes to Accounting Policies - Summary of Impacts of Adopting IFRS 15 in Consolidated Statement of Financial Position (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Current assets      
Unbilled receivables $ 384.6    
Contract assets 59.7 $ 69.2  
Other assets 23.2   $ 14.0
Non-current assets      
Deferred tax assets 21.2   23.2
Other assets 175.5   195.5
Current liabilities      
Deferred revenue 174.4    
Shareholders' equity      
Retained earnings 851.2   947.1
Accumulated other comprehensive income 163.1   $ 49.5
Previously stated [member]      
Current assets      
Unbilled receivables 444.4    
Other assets 20.3    
Non-current assets      
Deferred tax assets 21.8    
Other assets 167.3    
Current liabilities      
Deferred revenue 165.7    
Shareholders' equity      
Retained earnings 848.9    
Accumulated other comprehensive income 163.7    
Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Current assets      
Unbilled receivables (59.8)    
Contract assets 59.7    
Other assets 2.9    
Non-current assets      
Deferred tax assets (0.6)    
Other assets 8.2    
Current liabilities      
Deferred revenue 8.7    
Shareholders' equity      
Retained earnings 2.3    
Accumulated other comprehensive income $ (0.6)