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Employee Costs from Continuing Operations - Schedule of Employee Benefits Cost (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of employee costs [abstract]    
Wages, salaries, and benefits $ 2,358.8 $ 2,220.8
Pension costs 83.3 67.7
Share-based compensation 5.3 9.5
Total employee costs 2,447.4 2,298.0
Direct labor 1,540.0 1,411.9
Indirect labor 907.4 886.1
Total employee costs $ 2,447.4 $ 2,298.0