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Common shares (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Change in common shares
Changes in common shares for the periods presented in this report were as follows:
 
Issued and fully paid share capital $0.10 par value each
Shares$ millions
December 31, 2018 100,000,000 10 
RSU share issuance234,973 — 
December 31, 2019 100,234,973 10 
RSU share issuance149,462 — 
December 31, 2020 100,384,435 10