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CASH FLOW ITEMS - Changes in Other Investing Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash Flow Statement [Abstract]    
Interest received $ 26.3 $ 8.4
Disposition of investments 0.0 10.3
Acquisition of royalty interests (1.1) 0.0
Increase in restricted cash (31.0) (16.0)
Capital expenditures for exploration and evaluation assets 0.0 (1.9)
Acquisition of non-controlling interests 0.0 (0.7)
Other 0.9 (8.4)
Other investing activities $ (4.9) $ (8.3)