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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