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Financial risk management - Hedging activities (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
$ / £
Jun. 30, 2021
USD ($)
$ / £
Dec. 31, 2020
USD ($)
$ / £
Financial risk management activities      
Closing exchange rate | $ / £ 1.3486 1.3820 1.3655
US dollar      
Financial risk management activities      
Net debt $ 636,977 $ 626,300 $ 647,566
Hedged future USD revenues (34,124) (61,453) (63,720)
Unhedged USD borrowings 602,853 564,847 583,846
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 $ (13,023) $ (23,700) $ (2,434)