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Finance income and expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finance income    
Interest $ 3.5 $ 3.1
Finance income 3.5 3.1
Finance expenses    
Interest 7.4 1.5
Standby charges 2.1 2.1
Amortization of debt issue costs 0.9 1.0
Accretion of lease liabilities 0.2  
Finance expenses $ 10.6 $ 4.6