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CAPITAL AND RESERVES - Public Offering (Details) - $ / shares | Jun. 21, 2018 | Dec. 31, 2019 | Jun. 20, 2018
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Disclosure of classes of share capital [line items] |  |  |
Par value per share (in dollars per share) |  | $ 1.20 |
Entity common stock, shares outstanding (in shares) |  | 35,669,330 |
Luxembourg |  |  |
Disclosure of classes of share capital [line items] |  |  |
Par value per share (in dollars per share) |  |  | $ 1.20
Sale of stock, price per share (in dollars per share) | $ 52.00 |  |
Luxembourg | Ordinary shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares reserved for issue under options and contracts for sale of shares |  |  | 5,815,259
Number of additional shares authorized (in shares) |  |  | 872,289
Stock options issued (in shares) | 872,289 |  |

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