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Impairment Reversal (Charge) (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of impairment of assets [Abstract]  
Disclosure of Impairment Loss
Years ended December 31,
20252024
Fayolle
Mining properties$— $(6.8)
Westwood CGU
Mining properties, Plant and equipment and ROU assets— 426.5 
Asset retirement obligations— 35.8 
Exploration Assets held for Sale (note 6)
(12.2)— 
$(12.2)$455.5