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Income Taxes - Deductible Temporary Differences (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 2,340.7 $ 2,270.7
Operating tax loss    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 1,360.3 1,236.6
Net capital tax loss    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 32.2 36.5
Resource pools and other tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 135.7 174.7
Mineral properties, plant, and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 207.7 314.2
Closure and decommissioning costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 239.6 297.6
Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 365.2 $ 211.1