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REMUNERATION TO AUDITORS APPOINTED AT THE PARENT COMPANY'S ANNUAL GENERAL MEETING (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Audit fees      
Fees payable to the Company's auditor for the audit of the Company's annual accounts $ 0.4 $ 0.4 $ 0.2
Audit of the Company's subsidiaries pursuant to legislation 0.2 0.1 0.1
Total audit fees 0.6 0.5 0.3
Non-audit fees      
Audit related services 0.4 0.6 1.1
Tax services 0.0 0.3 0.5
Other services 0.0 0.1 0.2
Total non-audit fees 0.4 1.0 1.8
Total $ 1.0 $ 1.5 $ 2.1