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Finance income and expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Finance income    
Interest $ 3.7 $ 3.7
Finance income 3.7 3.7
Finance expenses    
Standby charges 2.2 2.1
Amortization of debt issue costs 1.1 1.0
Interest 0.2 0.3
Accretion of lease liabilities 0.1 0.1
Finance expenses $ 3.6 $ 3.5