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Other expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Auditor's remuneration [abstract] |  |  |
Research and development expenditures | $ 254.0 | $ 300.0 | $ 315.0
Disclosure of operating segments [line items] |  |  |
Total | 11.7 | 10.3 | 8.1
KPMG [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Audit fee |  | 2.8 | 7.1
Audit related fee |  | 1.2 | 1.0
Tax fee |  | 0.0 | 0.0
Other service fee |  | 0.0 | 0.0
Ernst and Young [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Audit fee | 10.7 | 4.7 |
Audit related fee | 1.0 | 0.5 |
Tax fee | 0.0 | 0.2 |
Other service fee | 0.0 | 0.9 |
Statoil operated licences [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
The audit fees and audit related fees | $ 0.5 | $ 0.5 | $ 0.9

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