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Share-based payment plans - Cash settled SARs - Exercise price (Details) - Cash-settled SARs
12 Months Ended
Dec. 31, 2017
CAD ($)
EquityInstruments
Dec. 31, 2016
CAD ($)
EquityInstruments
Dec. 31, 2015
CAD ($)
EquityInstruments
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 2,638,857 3,031,760 2,103,627
Weighted average remaining contractual life (in years) - Outstanding 3 years 6 months 4 years 2 months 12 days  
Weighted average exercise price per SAR - Outstanding $ 81.56 $ 79.64 $ 80.39
Weighted average exercise price per SAR - Outstanding $ 81.57    
Number of SARs - Exercisable | EquityInstruments 1,651,216 1,323,249  
Weighted average remaining contractual life (in years) - Exercisable 2 years 4 months 24 days 2 years 1 month 6 days  
Weighted average exercise price per SAR - Exercisable $ 83.61 $ 78.92  
$40.61 to $51.95      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments   123,592  
Weighted average remaining contractual life (in years) - Outstanding   7 months 6 days  
Weighted average exercise price per SAR - Outstanding   $ 48.58  
Number of SARs - Exercisable | EquityInstruments   123,592  
Weighted average remaining contractual life (in years) - Exercisable   7 months 6 days  
Weighted average exercise price per SAR - Exercisable   $ 48.58  
$56.95 to $70.46      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 612,364    
Weighted average remaining contractual life (in years) - Outstanding 7 years 8 months 12 days    
Weighted average exercise price per SAR - Outstanding $ 66.65    
Number of SARs - Exercisable | EquityInstruments 195,833    
Weighted average remaining contractual life (in years) - Exercisable 5 years 7 months 6 days    
Weighted average exercise price per SAR - Exercisable $ 66.15    
$71.25 to $83.36      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 825,143    
Weighted average remaining contractual life (in years) - Outstanding 1 year 10 months 24 days    
Weighted average exercise price per SAR - Outstanding $ 82.02    
Number of SARs - Exercisable | EquityInstruments 608,331    
Weighted average remaining contractual life (in years) - Exercisable 1 year 4 months 24 days    
Weighted average exercise price per SAR - Exercisable $ 81.97    
$56.95 to $69.73      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments   738,579  
Weighted average remaining contractual life (in years) - Outstanding   7 years 9 months 18 days  
Weighted average exercise price per SAR - Outstanding   $ 65.92  
Number of SARs - Exercisable | EquityInstruments   161,005  
Weighted average remaining contractual life (in years) - Exercisable   1 year 1 month 6 days  
Weighted average exercise price per SAR - Exercisable   $ 62.54  
$78.54 to $82.73      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments   887,472  
Weighted average remaining contractual life (in years) - Outstanding   2 years 9 months 18 days  
Weighted average exercise price per SAR - Outstanding   $ 82.10  
Number of SARs - Exercisable | EquityInstruments   554,515  
Weighted average remaining contractual life (in years) - Exercisable   1 year 10 months 24 days  
Weighted average exercise price per SAR - Exercisable   $ 81.86  
$83.60 to $90.48      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 863,475 923,242  
Weighted average remaining contractual life (in years) - Outstanding 2 years 6 months 3 years 6 months  
Weighted average exercise price per SAR - Outstanding $ 86.82 $ 86.82  
Number of SARs - Exercisable | EquityInstruments 621,825 364,546  
Weighted average remaining contractual life (in years) - Exercisable 2 years 3 months 18 days 3 years 1 month 6 days  
Weighted average exercise price per SAR - Exercisable $ 86.92 $ 87.00  
$92.13 to $97.93      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 337,875 358,875  
Weighted average remaining contractual life (in years) - Outstanding 2 years 4 months 24 days 3 years 4 months 24 days  
Weighted average exercise price per SAR - Outstanding $ 94.07 $ 94.06  
Number of SARs - Exercisable | EquityInstruments 225,227 119,591  
Weighted average remaining contractual life (in years) - Exercisable 2 years 4 months 24 days 3 years 4 months 24 days  
Weighted average exercise price per SAR - Exercisable $ 94.07 $ 94.06  
Minimum | $40.61 to $51.95      
Share-based payment plans      
Exercise price   40.61  
Minimum | $56.95 to $70.46      
Share-based payment plans      
Exercise price 56.95    
Minimum | $71.25 to $83.36      
Share-based payment plans      
Exercise price 71.25    
Minimum | $56.95 to $69.73      
Share-based payment plans      
Exercise price   56.95  
Minimum | $78.54 to $82.73      
Share-based payment plans      
Exercise price   78.54  
Minimum | $83.60 to $90.48      
Share-based payment plans      
Exercise price 83.60 83.60  
Minimum | $92.13 to $97.93      
Share-based payment plans      
Exercise price 93.30 92.13  
Maximum | $40.61 to $51.95      
Share-based payment plans      
Exercise price   51.95  
Maximum | $56.95 to $70.46      
Share-based payment plans      
Exercise price 70.46    
Maximum | $71.25 to $83.36      
Share-based payment plans      
Exercise price 82.73    
Maximum | $56.95 to $69.73      
Share-based payment plans      
Exercise price   69.73  
Maximum | $78.54 to $82.73      
Share-based payment plans      
Exercise price   82.73  
Maximum | $83.60 to $90.48      
Share-based payment plans      
Exercise price 90.48 90.48  
Maximum | $92.13 to $97.93      
Share-based payment plans      
Exercise price $ 97.93 $ 97.93