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Finance income and expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finance income    
Interest $ 3.7 $ 3.5
Finance income 3.7 3.5
Finance expenses    
Standby charges 2.1 2.1
Amortization of debt issue costs 1.0 0.9
Interest 0.3 7.4
Accretion of lease liabilities 0.1 0.2
Finance expenses $ 3.5 $ 10.6