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EMPLOYEE BENEFITS - Share options exercised during the year (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 717,240 511,668 338,709
Exercised during the year (in usd per share) | $ / shares $ 22.06 $ 13.76 $ 15.63
Weighted average share price (in usd per share) | $ / shares $ 88.51 $ 52.82  
Employee Stock Options | Exercise Price, $.95      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 9,900  
Exercised during the year (in usd per share) | $ / shares $ 0.95 $ 0.95  
Employee Stock Options | Exercise Price, $.71      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 200,000  
Exercised during the year (in usd per share) | $ / shares $ 0.71 $ 0.71  
Employee Stock Options | Exercise Price, $1.40      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 616  
Exercised during the year (in usd per share) | $ / shares $ 1.40 $ 1.40  
Employee Stock Options | Exercise Price, $2.48      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 1,793  
Exercised during the year (in usd per share) | $ / shares $ 2.48 $ 2.48  
Employee Stock Options | Exercise Price, $3.38      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 19,732  
Exercised during the year (in usd per share) | $ / shares $ 3.38 $ 3.38  
Employee Stock Options | Exercise Price, $2.71      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 6,031  
Exercised during the year (in usd per share) | $ / shares $ 2.71 $ 2.71  
Employee Stock Options | Exercise Price, $6.77      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 22,170 0  
Exercised during the year (in usd per share) | $ / shares $ 6.77 $ 6.77  
Employee Stock Options | Exercise Price, $0.95      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 1,103 0  
Exercised during the year (in usd per share) | $ / shares $ 0.95 $ 0.95  
Employee Stock Options | Exercise Price, $2.48      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 1,304 0  
Exercised during the year (in usd per share) | $ / shares $ 2.48 $ 2.48  
Employee Stock Options | Exercise Price, $3.38      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 13,223 0  
Exercised during the year (in usd per share) | $ / shares $ 3.38 $ 3.38  
Employee Stock Options | Exercise Price, $10.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 22,170 0  
Exercised during the year (in usd per share) | $ / shares $ 10.00 $ 10.00  
Employee Stock Options | Exercise Price, $12.22      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 47,169 0  
Exercised during the year (in usd per share) | $ / shares $ 12.22 $ 12.22  
Employee Stock Options | Exercise Price, $10.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 173,211 66,146  
Exercised during the year (in usd per share) | $ / shares $ 10.00 $ 10.00  
Employee Stock Options | Exercise Price, $13.20      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 0 3,769  
Exercised during the year (in usd per share) | $ / shares $ 13.20 $ 13.20  
Employee Stock Options | Exercise Price, $28.31      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 163,834 111,843  
Exercised during the year (in usd per share) | $ / shares $ 28.31 $ 28.31  
Employee Stock Options | Exercise Price, $34.20      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 8,000 3,000  
Exercised during the year (in usd per share) | $ / shares $ 34.20 $ 34.20  
Employee Stock Options | Exercise Price, $29.34      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 12,097 1,200  
Exercised during the year (in usd per share) | $ / shares $ 29.34 $ 29.34  
Employee Stock Options | Exercise Price, $22.77      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 30,000 0  
Exercised during the year (in usd per share) | $ / shares $ 22.77 $ 22.77  
Employee Stock Options | Exercise Price, $29.01      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 105,020 18,750  
Exercised during the year (in usd per share) | $ / shares $ 29.01 $ 29.01  
Employee Stock Options | Exercise Price, $32.36      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 98,939 68,888  
Exercised during the year (in usd per share) | $ / shares $ 32.36 $ 32.36  
Employee Stock Options | Exercise Price, $44.97      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 5,000 0  
Exercised during the year (in usd per share) | $ / shares $ 44.97 $ 44.97  
Employee Stock Options | Exercise Price, $46.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 10,000 0  
Exercised during the year (in usd per share) | $ / shares $ 46.00 $ 46.00  
Employee Stock Options | Exercise Price $50.92      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 1,500 0  
Exercised during the year (in usd per share) | $ / shares $ 50.92 $ 50.92  
Employee Stock Options | Exercise Price $55.07      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options exercised in share-based payment arrangement (in shares) | shares 2,500 0  
Exercised during the year (in usd per share) | $ / shares $ 55.07 $ 55.07  
Restricted Stock Units      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 181,860 163,233  
Restricted Stock Units | Grant Price, $36.30      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 500 500  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 36.30 $ 36.30  
Restricted Stock Units | Grant Price, $37.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 45,283 45,906  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 37.00 $ 37.00  
Restricted Stock Units | Grant Price, $38.21      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 0 2,671  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 38.21 $ 38.21  
Restricted Stock Units | Grant Price, $42.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 2,250 2,250  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 42.00 $ 42.00  
Restricted Stock Units | Grant Price, $45.50      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 0 107,463  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 45.50 $ 45.50  
Restricted Stock Units | Grant Price, $53.29      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 0 4,443  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 53.29 $ 53.29  
Restricted Stock Units | Grant Price, $46.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 100,206 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 46.00 $ 46.00  
Restricted Stock Units | Grant Price, $55.07      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 1,000 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 55.07 $ 55.07  
Restricted Stock Units | Grant Price, $57.39      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 436 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 57.39 $ 57.39  
Restricted Stock Units | Grant Price, $52.74      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 1,000 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 52.74 $ 52.74  
Restricted Stock Units | Grant Price, $50.92      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 2,500 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 50.92 $ 50.92  
Restricted Stock Units | Grant Price, $56.87      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 1,500 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 56.87 $ 56.87  
Restricted Stock Units | Grant Price, $69.77      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | shares 27,185 0  
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in usd per share) | $ / shares $ 69.77 $ 69.77