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OTHER EXPENSES (Tables)
12 Months Ended
Dec. 31, 2023
Analysis of income and expense [abstract]  
Disclosure of other expenses (income)
Years ended December 31,
Notes20232022
Changes in asset retirement obligations at closed mines15(a)$9.7 $1.6 
Write-down of assets1.3 0.6 
Forfeiture of carbon fines 15(b)13.5 — 
Settlement of carbon fines 15(b)15.0 — 
Other10.0 6.9 
$49.5 $9.1