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EMPLOYEE BENEFITS - Evolution of share options outstanding (Details)
 12 Months Ended
Jul. 18, 2014
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Par value per share (in dollars per share) | $ / shares   $ 1.20    
Number of options (in shares)        
Balance at the beginning of year (in shares) | shares   1,786,467 2,155,851  
Options granted during the year (in shares) | shares   4,000 221,000  
Forfeited during the year (in shares) | shares   (21,625) (78,716)  
Exercised during the year (in shares) | shares   (717,240) (511,668) (338,709)
Balance at end of year (in shares) | shares   1,051,602 1,786,467 2,155,851
Weighted average exercise price (in usd per share)        
Balance at the beginning of year (in usd per share) | $ / shares   $ 27.96 $ 23.02  
Options granted during the year (in usd per share) | $ / shares   52.10 46.45  
Forfeited during the year (in usd per share) | $ / shares   31.77 36.89  
Exercised during the year (in usd per share) | $ / shares   22.06 13.76 $ 15.63
Balance at the end of year (in usd per share) | $ / shares   $ 31.82 $ 27.96 $ 23.02
Restricted Stock Units        
Number of RSU (in shares)        
Issued during the year (in shares) | shares   (181,860) (163,233)  
Balance at end of year (in shares) | shares   622,322    
Employee and Non Employee Restricted Stock Units        
Number of RSU (in shares)        
Balance at the beginning of year (in shares) | shares   535,838 164,859  
RSU granted during the year (in shares) | shares   309,539 564,995 254,328
Forfeited during the year (in shares) | shares   (38,621) (30,783)  
Issued during the year (in shares) | shares   (181,860) (163,233) (86,931)
Balance at end of year (in shares) | shares   624,896 535,838 164,859
Weighted average grant price (in usd per share)        
Balance at the beginning of year (in usd per share) | $ / shares   $ 44.70 $ 37.58  
RSU granted during the year (in usd per share) | $ / shares   85.80 46.29  
Forfeited during the year (in usd per share) | $ / shares   47.69 44.14  
Issued during the year (in usd per share) | $ / shares   37.00 43.13 $ 36.11
Balance at the end of year (in usd per share) | $ / shares   $ 64.05 $ 44.70 $ 37.58
2012 Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Maximum term       7 years
2014 Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Maximum term   10 years    
2014 Plan | Stock Options        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting term 4 years      
2014 Plan | Stock Options | Tranche One        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 25.00%      
2014 Plan | Stock Options | Tranche Two        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 25.00%      
2014 Plan | Stock Options | Tranche Three        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 25.00%      
2014 Plan | Stock Options | Tranche Four        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 25.00%      
2014 Plan | Restricted Stock Units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Par value per share (in dollars per share) | $ / shares   $ 1.20