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ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS - Divestiture of Discontinued Operation - Earning (loss) from Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Loss before tax $ 708.6 $ 106.7
Income tax expense - net $ (293.2) (76.1)
Highland Gold Mining group    
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Revenue   213.8
Expenses   794.8
Loss before tax   (581.0)
Income tax expense - net   (61.2)
Loss and other comprehensive loss from discontinued operations after tax   (642.2)
Gain (loss) on disposition   80.9
Impairment change on sale of business   671.0
Discontinued operations | Highland Gold Mining group    
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Gain (loss) on disposition   80.9
Impairment change on sale of business   671.0
Reclassification of AOCI earnings from discontinued operation on discontinued of hedge   18.8
Discontinued operations | Chirano Mine    
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Revenue   162.3
Expenses   144.6
Loss before tax   17.7
Income tax expense - net   (11.8)
Loss and other comprehensive loss from discontinued operations after tax   $ 5.9