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DISCONTINUED OPERATIONS - Loss on disposal (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 31, 2023
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of analysis of single amount of discontinued operations [line items]          
Working capital     $ (14.9) $ (40.6)  
Cash and cash equivalents     367.1 407.8 $ 544.9
Receivables and other current assets     85.7 128.0  
Inventories     266.3 199.9  
Property, plant and equipment     3,496.5 2,598.0  
Other non-current assets     76.3 128.8  
Accounts payable and accrued liabilities     (317.6) (294.1)  
Provisions     (5.4) (5.6)  
Other liabilities     0.0 (1.0)  
Non-controlling interests     (58.1) (76.0)  
Assets     4,537.9 4,425.1  
Discontinued operations          
Disclosure of analysis of single amount of discontinued operations [line items]          
Assets     $ 34.6 $ 785.6  
Discontinued operations | Disposal of major subsidiary | Rosebel Mine          
Disclosure of analysis of single amount of discontinued operations [line items]          
Proceeds received on closing $ 360.0        
Cash and cash equivalents transferred since closing 39.4        
Working capital (3.4)        
Transaction costs (8.7)        
Net proceeds 387.3        
Cash and cash equivalents 39.8        
Receivables and other current assets 26.7        
Inventories 153.7        
Property, plant and equipment 446.2        
Other non-current assets 10.5        
Accounts payable and accrued liabilities (76.0)        
Provisions (103.8)        
Other liabilities (89.1)        
Net carrying amount 408.0        
Non-controlling interests (13.3)        
Assets 394.7        
Loss on sale of Rosebel $ 7.4 $ 7.4