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COST OF SALES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
Operating costs $ 748.6 $ 675.5
Royalties 60.6 59.2
Depreciation expense 339.8 256.7
Cost of sales $ 1,149.0 $ 991.4