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OTHER EXPENSES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
COVID-19 expenses $ 16.0 $ 27.4
Temporary Suspension Expenses 0.0 16.0
Care and maintenance costs 24.5 18.6
Write-down of assets 4.7 2.5
Consulting costs 0.5 1.5
Changes in asset retirement obligations at closed mines4 40.7 6.1
Restructuring costs 1.0 0.0
Other 4.6 3.9
Other expenses $ 92.0 $ 76.0