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DISCONTINUED OPERATIONS - Net (loss) earnings from discontinued operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of non-current assets held for sale and discontinued operations [Line Items]    
Revenues $ 987.1 $ 958.8
Cost of sales (863.0) (810.9)
General and administrative expenses (48.6) (52.0)
Exploration expenses (26.3) (28.4)
Impairment charge 0.0 (17.1)
Other expenses (49.5) (9.1)
Finance costs (21.0) (8.6)
Foreign exchange gain (loss) (12.8) (5.0)
Interest income, derivatives and other investment gains 53.2 14.0
Earnings before income taxes 128.2 41.7
Net earnings (loss) from discontinued operations 6.3 (16.4)
Discontinued operations    
Disclosure of non-current assets held for sale and discontinued operations [Line Items]    
Revenues 47.2 405.2
Cost of sales (23.8) (330.7)
General and administrative expenses 0.0 (3.5)
Exploration expenses (0.1) (1.2)
Impairment charge 0.0 (110.1)
Other expenses (1.3) (2.5)
Finance costs (0.1) (1.2)
Foreign exchange gain (loss) (0.2) 0.4
Interest income, derivatives and other investment gains 0.0 6.6
Earnings before income taxes 21.7 (37.0)
Income tax (8.0) 20.6
Net earnings (loss) from discontinued operations before disposal 13.7 (16.4)
Loss on sale of Rosebel (7.4) 0.0
Net earnings (loss) from discontinued operations $ 6.3 $ (16.4)