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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

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