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CAPITAL STOCK (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Disclosure of classes of share capital [line items]        
Dividends paid, ordinary shares $ 76.3      
Common shares        
Disclosure of classes of share capital [line items]        
Number of shares issued (shares)   1,752,668,983    
Par value per share (in dollars per share)   $ 0    
Capital stock        
Disclosure of classes of share capital [line items]        
Number of Shares Issued in Dividend Reinvestment Plan with Owners   1,127,895 571,000  
Randgold [Member]        
Disclosure of classes of share capital [line items]        
Dividends paid, ordinary shares $ 256.2      
Randgold [Member] | Common shares        
Disclosure of classes of share capital [line items]        
Number of shares issued (shares)       583,669,178