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Other Expense (Income) (Tables)
12 Months Ended
Dec. 31, 2023
Analysis of income and expense [abstract]  
Schedule of Other Expense (Income)
 20232022
Change in closure and decommissioning estimates (1)
$20.4 $4.7 
Change in provisions4.5 5.0 
Provisions on supplies and other assets4.4 — 
Investment income(16.0)(5.4)
Other expense (income)8.0 (2.2)
Total$21.3 $2.1 
(1)Relates to changes in estimates after the completion of mining activities.