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Financial risk management - Hedging activities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
$ / £
Jun. 30, 2020
USD ($)
$ / £
Dec. 31, 2019
USD ($)
$ / £
Financial risk management activities      
Closing exchange rate | $ / £ 1.3655 1.2374 1.3200
US dollar      
Financial risk management activities      
Net debt $ 647,566 $ 646,975 $ 591,108
Hedged future USD revenues (63,720) (177,524) (199,137)
Unhedged USD borrowings 583,846 469,451 391,971
Borrowings | US dollar      
Financial risk management activities      
Net debt 650,000 650,000 650,000
Cash | US dollar      
Financial risk management activities      
Net debt $ (2,434) $ (3,025) $ (58,892)