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Financial risk management - Hedging activities (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
$ / £
Jun. 30, 2022
USD ($)
$ / £
Dec. 31, 2021
USD ($)
$ / £
Financial risk management activities      
Closing exchange rate | $ / £ 1.2040 1.2151 1.3486
US dollar      
Financial risk management activities      
Net debt $ 641,100 $ 613,000 $ 636,977
Hedged future revenues (50,780) (22,800) (34,124)
Unhedged borrowings 590,320 590,200 602,853
Borrowings | US dollar      
Financial risk management activities      
Net debt 650,000 650,000 650,000
Cash and cash equivalents | US dollar      
Financial risk management activities      
Net debt $ (8,900) $ (37,000) $ (13,023)