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INTEREST INCOME, DERIVATIVES AND OTHER INVESTMENT GAINS (LOSSES) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]    
Interest income $ 27.8 $ 8.5
Gain on sale of royalties 15.5 0.0
Gains (losses) on non-hedge derivatives and warrants 12.6 3.1
Insurance recoveries 0.6 1.2
Fair value of deferred consideration from the sale of Sadiola (4.3) 0.7
Other gains (losses) 1.0 0.5
Interest income, derivatives and other investment gains $ 53.2 $ 14.0