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Other expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Auditor's remuneration [abstract] |  |  |
Research and development expenditures | $ 300.0 | $ 315.0 | $ 307.0
Disclosure of operating segments [line items] |  |  |
Total | 10.3 | 8.1 | 7.0
KPMG [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Audit fee | 2.8 | 7.1 | 6.1
Audit related fee | 1.2 | 1.0 | 0.9
Tax fee | 0.0 | 0.0 | 0.0
Other service fee | 0.0 | 0.0 | 0.0
Ernst and Young [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Audit fee | 4.7 | 0.0 | 0.0
Audit related fee | 0.5 | 0.0 | 0.0
Tax fee | 0.2 | 0.0 | 0.0
Other service fee | 0.9 | 0.0 | 0.0
Statoil operated licences [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
The audit fees and audit related fees | $ 0.5 | $ 0.9 | $ 0.8

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