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EQUITY - Dividend policy (Details) - $ / shares
1 Months Ended
Jan. 31, 2019
Oct. 31, 2018
Aug. 31, 2018
May 31, 2018
Jan. 31, 2018
Oct. 31, 2017
Aug. 31, 2017
May 31, 2017
Jan. 31, 2017
Series A                  
EQUITY                  
Interim dividend per share $ 21.50 $ 21.50     $ 21.50 $ 19.00     $ 19.00
Final dividend per share       $ 21.50       $ 19.00  
Additional dividend paid per share     $ 21.50       $ 19.00    
Series B Share                  
EQUITY                  
Interim dividend per share $ 23.65 $ 23.65     $ 23.65 $ 20.90     $ 20.90
Final dividend per share       $ 23.65       $ 20.90  
Additional dividend paid per share     $ 23.65       $ 20.90