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ACQUISITIONS, DIVESTITURES AND CONTINUED OPERATIONS - Divestiture of Discontinued Operation - Cash flows from Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows of discontinued operations:    
Net cash flow provided from operating activities $ 47.6 $ 440.1
Net cash flow provided from (used) in investing activities 296.2 (257.0)
Net cash flow of discontinued operations 0.8 (1.7)
Highland Gold Mining group    
Cash flows of discontinued operations:    
Cash proceeds received on completion of the sale of business 300.0  
Discontinued operations    
Cash flows of discontinued operations:    
Net cash flow provided from operating activities 36.8 393.6
Net cash flow provided from (used) in investing activities 263.5 (218.2)
Effect of exchange rate changes on cash and cash equivalents 2.3 0.4
Net cash flow of discontinued operations 302.6 175.8
Discontinued operations | Highland Gold Mining group    
Cash flows of discontinued operations:    
Cash proceeds received on completion of the sale of business 300.0  
Paid to settle the deferred payment obligation 141.5  
Discontinued operations | Chirano Mine    
Cash flows of discontinued operations:    
Net cash flow provided from operating activities 10.8 46.5
Net cash flow provided from (used) in investing activities 32.7 (38.8)
Effect of exchange rate changes on cash and cash equivalents (0.7) 0.1
Net cash flow of discontinued operations 42.8 $ 7.8
Discontinued operations | Chulbatkan license    
Cash flows of discontinued operations:    
Cash proceeds received on completion of the sale of business $ 60.0