XML 81 R50.htm IDEA: XBRL DOCUMENT v3.23.1
Inventory (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of inventories [Line Items]      
Mining and processing costs, inventories   $ 400.5 $ 360.4
Amortization   171.5 170.9
Amortization costs, Inventories     170.9
Inventory net realizable value adjustment (note 6) $ 33.9 33.9 $ 0.0
Inventory write-down, after tax   22.4  
Mining and Processing Costs      
Disclosure of inventories [Line Items]      
Inventory net realizable value adjustment (note 6)   27.6  
Amortization      
Disclosure of inventories [Line Items]      
Inventory net realizable value adjustment (note 6)   $ 6.3