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ACCOUNTING POLICIES, CRITICAL ACCOUNTING ESTIMATES AND JUDGEMENTS - Reconciliation of lease liabilities pursuant to IFRS 16 on transition (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
ACCOUNTING POLICIES, CRITICAL ACCOUNTING ESTIMATES AND JUDGEMENTS      
Total operating lease commitments at 31 December 2018     $ 6.2
Operating lease liabilities before discounting   $ 6.2  
Discounted using incremental borrowing rate   (0.6)  
Operating lease liability   5.6  
Reasonably certain extension options   4.5  
Other adjustments   (0.2)  
Finance lease liabilities recognized under IAS 17   25.3  
Total lease liabilities recognized under IFRS 16 at 1 January 2019 $ 30.6 $ 35.2 $ 25.3