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DEFERRED REVENUE - Changes in Deferred Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period $ 251.6 $ 240.8
Proceeds from gold prepayment 119.3  
Deferred revenue recognized 235.7  
Finance costs 15.9 10.8
Contract liabilities at end of period 151.1 251.6
Current portion of deferred revenue 151.1 240.7
Deferred revenue 0.0 10.9
Current portion of deferred revenue 151.1  
2022 Prepay Arrangements    
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period 251.6 240.8
Proceeds from gold prepayment 0.0  
Deferred revenue recognized 235.7  
Finance costs 6.7 10.8
Contract liabilities at end of period 22.6 251.6
Current portion of deferred revenue 22.6  
Deferred revenue 0.0  
Current portion of deferred revenue 22.6  
2024 Q1 Prepay Arrangements    
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period 0.0 0.0
Proceeds from gold prepayment 59.9  
Deferred revenue recognized 0.0  
Finance costs 5.6 0.0
Contract liabilities at end of period 65.5 0.0
Current portion of deferred revenue 65.5  
Deferred revenue 0.0  
Current portion of deferred revenue 65.5  
2024 Q2 Prepay Arrangements    
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period 0.0 0.0
Proceeds from gold prepayment 59.4  
Deferred revenue recognized 0.0  
Finance costs 3.6 0.0
Contract liabilities at end of period 63.0 $ 0.0
Current portion of deferred revenue 63.0  
Deferred revenue 0.0  
Current portion of deferred revenue $ 63.0