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Financial risk management - Hedging activities (Details) $ in Thousands | Dec. 31, 2020 USD ($) $ / £ | Jun. 30, 2020 USD ($) $ / £ | Dec. 31, 2019 USD ($) $ / £
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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)

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of net debt of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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