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PROVISIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Provisions    
Provisions at beginning of period $ 806.7  
Additions 142.8  
Reductions (6.4)  
Reclamation spending (22.2)  
Accretion 37.0  
Reclamation expense (19.2)  
Provisions at end of period 938.7 $ 806.7
Current portion 48.8  
Non-current portion 889.9  
Other operating expense 64.5 113.8
Reclamation and remediation obligations    
Provisions    
Provisions at beginning of period 779.0  
Additions 102.3  
Reclamation spending (22.2)  
Accretion 37.0  
Reclamation expense (19.2)  
Provisions at end of period 876.9 779.0
Current portion 43.4  
Non-current portion 833.5  
Other operating expense 19.2 23.5
Letter of credit issued to various agencies 440.8 463.2
Surety bonds outstanding $ 375.1 $ 317.0
Reclamation and remediation obligations | Minimum    
Provisions    
Discount rate used in estimating site restoration cost obligation (in percent) 3.80% 3.90%
Inflation rate used in estimating the site restoration cost obligation (in percent) 2.00% 2.00%
Reclamation and remediation obligations | Maximum    
Provisions    
Discount rate used in estimating site restoration cost obligation (in percent) 8.40% 8.80%
Inflation rate used in estimating the site restoration cost obligation (in percent) 4.50% 8.70%
Other    
Provisions    
Provisions at beginning of period $ 27.7  
Additions 40.5  
Reductions (6.4)  
Provisions at end of period 61.8 $ 27.7
Current portion 5.4  
Non-current portion $ 56.4