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Assets held for sale - Summary of assets held for sale (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [line items]    
Assets held for sale $ 153.3 $ 0.0
Ashanko Gold investment    
Disclosure of transactions between related parties [line items]    
Assets held for sale 153.3 0.0
– Asanko Gold joint venture    
Disclosure of transactions between related parties [line items]    
Assets held for sale 53.6 0.0
Asanko redeemable preference shares    
Disclosure of transactions between related parties [line items]    
Assets held for sale 99.7 0.0
Rusoro Mining Limited    
Disclosure of transactions between related parties [line items]    
Assets held for sale $ 0.0 $ 0.0