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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Long-term debt      
Long-term debt and credit facilities   $ 2,232.6 $ 2,556.9
Reclamation and remediation obligations      
Long-term debt      
Surety bonds outstanding   $ 375.1 317.0
Operations in Brazil, Mauritania, Ghana and Chile      
Long-term debt      
Fees incurred (as a percentage)   0.75%  
Surety bonds outstanding   $ 241.8 267.5
EDC      
Long-term debt      
Maximum borrowing capacity   $ 300.0  
Borrowings, maturity June 30, 2024    
Fees incurred (as a percentage)   0.75%  
Long-term debt and credit facilities   $ 235.7 230.4
Surety bond      
Long-term debt      
Fees incurred (as a percentage)   0.55%  
Surety bonds outstanding   $ 376.1 318.0
Surety bond | Reclamation and remediation obligations      
Long-term debt      
Surety bonds outstanding   $ 375.1 $ 317.0