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DISCONTINUED OPERATIONS - Assets and liabilities included in the held-for-sale categories (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of non-current assets held for sale and discontinued operations [Line Items]      
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  
Assets 4,537.9 4,425.1  
Accounts payable and accrued liabilities 317.6 294.1  
Current portion of provisions 5.4 5.6  
Deferred income tax liabilities 0.7 22.6  
Leases 100.2 68.7  
Provisions 360.1 310.4  
Other liabilities 0.0 19.6  
Liabilities 2,273.8 2,218.3  
Assets and liabilities classified as held for sale | Rosebel Mine      
Disclosure of non-current assets held for sale and discontinued operations [Line Items]      
Cash and cash equivalents 0.0 38.5  
Receivables and other current assets 0.0 4.9  
Inventories 0.0 155.8  
Property, plant and equipment 0.0 435.8  
Other non-current assets 0.0 34.6  
Assets 0.0 669.6  
Accounts payable and accrued liabilities 0.0 84.2  
Current portion of provisions 0.0 4.2  
Deferred income tax liabilities 0.0 17.4  
Leases 0.0 39.5  
Provisions 0.0 103.8  
Other liabilities 0.0 19.5  
Liabilities $ 0.0 $ 268.6