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PROVISIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Provisions    
Balance at the beginning of the period $ 938.7  
Balance at the end of the period 1,004.0 $ 938.7
Less: current portion (62.5) (48.8)
Non-current portion 941.5 889.9
Reclamation and remediation obligations    
Provisions    
Balance at the beginning of the period 876.9 779.0
Change in estimate 60.0 83.1
Accretion 40.9 37.0
Payments (29.2) (22.2)
Balance at the end of the period 948.6 876.9
Less: current portion (55.7) (43.4)
Non-current portion 892.9 833.5
Other operating expense 6.9 19.2
Letter of credit issued to various agencies 478.4 418.9
Surety bonds outstanding $ 451.8 $ 375.1
Reclamation and remediation obligations | Minimum    
Provisions    
Discount rate used in estimating site restoration cost obligation (in percent) 4.30% 3.80%
Inflation rate used in estimating the site restoration cost obligation (in percent) 1.90% 2.00%
Reclamation and remediation obligations | Maximum    
Provisions    
Discount rate used in estimating site restoration cost obligation (in percent) 8.40% 8.40%
Inflation rate used in estimating the site restoration cost obligation (in percent) 4.20% 4.50%
Other    
Provisions    
Balance at the beginning of the period $ 61.8  
Balance at the end of the period $ 55.4 $ 61.8