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REMUNERATION TO AUDITORS APPOINTED AT THE PARENT COMPANY'S ANNUAL GENERAL MEETING - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
REMUNERATION TO AUDITORS APPOINTED AT THE PARENT COMPANY'S ANNUAL GENERAL MEETING      
Auditor's remuneration $ 0.7 $ 0.8 $ 1.0
Total audit fees 0.6 0.6 0.6
Auditor's remuneration for audit services $ 0.1 $ 0.2 $ 0.4