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Finance income and expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Finance income        
Interest $ 2.8 $ 1.7 $ 3.5 $ 2.4
Finance income 2.8 1.7 3.5 2.4
Finance expenses        
Standby charges 0.5 0.5 1.1 1.1
Amortization of debt issue costs 0.3 0.3 0.6 0.5
Interest   0.2   0.2
Accretion of lease liabilities   0.1   0.1
Finance expenses $ 0.8 $ 1.1 $ 1.7 $ 1.9