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REMUNERATION TO AUDITORS APPOINTED AT THE PARENT COMPANY'S ANNUAL GENERAL MEETING (Detail Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Auditor's remuneration [abstract]      
Auditor's remuneration $ 1.0 $ 1.5 $ 2.1
Total audit fees 0.6 0.5 0.3
Auditor's remuneration for audit services 0.4 0.6 1.1
Auditor's remuneration for tax services 0.0 0.3 0.5
Auditor's remuneration for other services $ 0.0 $ 0.1 $ 0.2