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Impairment - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment loss     $ 0.0 $ 78.6
Inventories, at net realisable value $ 170.0   76.2 170.0
Shahuindo        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment loss $ 36.2   0.0 36.2
Morococha        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment loss   $ 42.4 $ 0.0 $ 42.4
Carrying value   $ 25.0