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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