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Share-based payment plans - Equity settled SARs - Exercise price (Details) - Equity-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 3,338,148 3,161,657 2,233,299
Weighted average remaining contractual life (in years) - Outstanding 5 years 2 months 12 days 5 years 3 months 18 days  
Weighted average exercise price per SAR - Outstanding $ 78.61 $ 78.04 $ 81.18
Weighted average exercise price per SAR - Outstanding $ 78.60    
Number of SARs - Exercisable | EquityInstruments 1,812,010 1,395,572  
Weighted average remaining contractual life (in years) - Exercisable 2 years 8 months 12 days 2 years 7 months 6 days  
Weighted average exercise price per SAR - Exercisable $ 83.50 $ 82.70  
$40.61 to $57.05      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments   1,179,971  
Weighted average remaining contractual life (in years) - Outstanding   9 years 2 months 12 days  
Weighted average exercise price per SAR - Outstanding   $ 65.45  
Number of SARs - Exercisable | EquityInstruments   94,071  
Weighted average remaining contractual life (in years) - Exercisable   9 months 18 days  
Weighted average exercise price per SAR - Exercisable   $ 51.22  
$40.61 To $69.86      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 1,216,810    
Weighted average remaining contractual life (in years) - Outstanding 9 years    
Weighted average exercise price per SAR - Outstanding $ 66.64    
Number of SARs - Exercisable | EquityInstruments 211,750    
Weighted average remaining contractual life (in years) - Exercisable 8 years 10 months 24 days    
Weighted average exercise price per SAR - Exercisable $ 66.72    
$71.22 to $85.82      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 1,347,504 1,202,352  
Weighted average remaining contractual life (in years) - Outstanding 3 years 8 months 12 days 3 years 1 month 6 days  
Weighted average exercise price per SAR - Outstanding $ 83.98 $ 83.89  
Number of SARs - Exercisable | EquityInstruments 847,093 774,845  
Weighted average remaining contractual life (in years) - Exercisable 1 year 10 months 24 days 2 years 7 months 6 days  
Weighted average exercise price per SAR - Exercisable $ 83.72 $ 83.00  
$87.70 to $95.67      
Share-based payment plans      
Number of SARs - Outstanding | EquityInstruments 773,834 779,334  
Weighted average remaining contractual life (in years) - Outstanding 1 year 10 months 24 days 2 years 10 months 24 days  
Weighted average exercise price per SAR - Outstanding $ 88.05 $ 88.05  
Number of SARs - Exercisable | EquityInstruments 753,167 526,656  
Weighted average remaining contractual life (in years) - Exercisable 1 year 10 months 24 days 2 years 10 months 24 days  
Weighted average exercise price per SAR - Exercisable $ 87.96 $ 87.89  
Minimum | $40.61 to $57.05      
Share-based payment plans      
Exercise price   40.61  
Minimum | $40.61 To $69.86      
Share-based payment plans      
Exercise price 65.82    
Minimum | $71.22 to $85.82      
Share-based payment plans      
Exercise price 72.33 71.22  
Minimum | $87.70 to $95.67      
Share-based payment plans      
Exercise price 87.70 87.70  
Maximum | $40.61 to $57.05      
Share-based payment plans      
Exercise price   66.72  
Maximum | $40.61 To $69.86      
Share-based payment plans      
Exercise price 69.86    
Maximum | $71.22 to $85.82      
Share-based payment plans      
Exercise price 85.82 85.82  
Maximum | $87.70 to $95.67      
Share-based payment plans      
Exercise price $ 95.67 $ 95.67