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LEASES - Lease liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of leases [Roll Forward]    
Balance, beginning of year $ 73.8 $ 65.6
Additions 79.7 72.1
Interest expense 7.5 3.1
Foreign exchange impact 1.0 (2.9)
Principal lease payments (6.0) (21.3)
Interest payments (5.3) (3.3)
UJV lease adjustment (29.4) 0.0
Reclassification of Rosebel mine leases to liabilities held for sale 0.0 (39.5)
Balance, end of year 121.3 73.8
Current portion 21.1 5.1
Non-current portion 100.2 68.7
Lease obligations $ 121.3 $ 73.8