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OTHER (INCOME) EXPENSES
 12 Months Ended
Dec. 31, 2024
Analysis of income and expense [abstract]  
Other (Income) Expenses Other (Income) Expenses
Years ended December 31,
Notes20242023
Changes in asset retirement obligations at closed mines14(a)$(13.4)$9.7 
Write-down of assets0.9 1.3 
Forfeiture of carbon fines 14(b)— 13.5 
Settlement of carbon fines 14(b)— 15.0 
Other3.3 7.8 
$(9.2)$47.3