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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, 2022
Dec. 31, 2021
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Earnings (loss) before tax $ 106.7 $ 84.3
Income tax expense - net (76.1) (115.0)
Highland Gold Mining group    
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Revenue 213.8 862.8
Expenses 794.8 457.5
Earnings (loss) before tax (581.0) 405.3
Income tax expense - net (61.2) (143.8)
Earnings (Loss) and other comprehensive income (loss) from discontinued operations after tax (642.2) 261.5
Gain (loss) on disposition 80.9  
Impairment change on sale of business 671.0  
Chirano Mine    
ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS    
Gain (loss) on disposition 0.5  
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 162.3 267.0
Expenses 144.6 287.2
Earnings (loss) before tax 17.7 (20.2)
Income tax expense - net (11.8) 8.1
Earnings (Loss) and other comprehensive income (loss) from discontinued operations after tax $ 5.9 $ (12.1)