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DEFERRED REVENUE - Changes in Deferred Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period $ 240.8 $ 189.7
Proceeds from gold prepayment   236.0
Revenue recognized   (195.0)
Accretion expense, prepayment on qualifying assets 10.8 10.1
Contract liabilities at end of period 251.6 240.8
Current portion of deferred revenue 240.7 0.0
Deferred revenue 10.9 240.8
Current portion of deferred revenue 251.6  
2019 Prepay Arrangement    
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period 0.0 189.7
Proceeds from gold prepayment   0.0
Revenue recognized   (195.0)
Accretion expense, prepayment on qualifying assets 0.0 5.3
Contract liabilities at end of period 0.0 0.0
Current portion of deferred revenue 0.0  
Deferred revenue 0.0  
Current portion of deferred revenue 0.0  
2022 Prepay Arrangements    
Revenue From Contract With Customer [Roll Forward]    
Contract liabilities at beginning of period 240.8 0.0
Proceeds from gold prepayment   236.0
Revenue recognized   0.0
Accretion expense, prepayment on qualifying assets 10.8 4.8
Contract liabilities at end of period 251.6 $ 240.8
Current portion of deferred revenue 240.7  
Deferred revenue 10.9  
Current portion of deferred revenue $ 251.6