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Other (Income) Expenses
 12 Months Ended
Dec. 31, 2025
Analysis of income and expense [abstract]  
Other (Income) Expenses Other (Income) Expenses
Years ended December 31,
Notes20252024
Changes in asset retirement obligations at closed mines14(a)$8.0 $(13.4)
Write-down of assets3.6 0.9 
Other3.2 3.3 
$14.8 $(9.2)