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FINANCIAL INSTRUMENTS - Cash Flow Hedge Fair Value Reserve (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gain (Loss) Recognized in Cash Flow Hedge [Abstract]      
Unrealized gain (loss) recognized in cash flow hedge reserve $ 57.8 $ 18.8  
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve 33.6 (9.8)  
Premiums paid 1.8 6.6  
Time value excluded from hedge relationship (3.3) 3.3  
Other comprehensive income, before tax, cash flow hedges 64.0 34.7 $ 2.8
Current portion of hedge asset 30.7    
Non-current portion of hedge asset 34.0    
Current portion of hedge liability 0.0    
Non-current portion of hedge liability (0.7)    
Hedging Instrument, assets (liabilities) 64.0    
Canadian dollar contracts      
Gain (Loss) Recognized in Cash Flow Hedge [Abstract]      
Unrealized gain (loss) recognized in cash flow hedge reserve 11.4 32.3  
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve 20.6 (0.3)  
Premiums paid 0.0 0.0  
Time value excluded from hedge relationship 1.4 (1.1)  
Other comprehensive income, before tax, cash flow hedges 24.5 35.1 1.4
Current portion of hedge asset 13.6    
Non-current portion of hedge asset 10.9    
Current portion of hedge liability 0.0    
Non-current portion of hedge liability 0.0    
Hedging Instrument, assets (liabilities) 24.5    
Oil contracts      
Gain (Loss) Recognized in Cash Flow Hedge [Abstract]      
Unrealized gain (loss) recognized in cash flow hedge reserve 44.3 (13.5)  
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve 10.9 (9.5)  
Premiums paid 0.0 0.0  
Time value excluded from hedge relationship (13.5) 5.8  
Other comprehensive income, before tax, cash flow hedges 38.5 (8.4) 1.4
Current portion of hedge asset 15.7    
Non-current portion of hedge asset 22.8    
Current portion of hedge liability 0.0    
Non-current portion of hedge liability 0.0    
Hedging Instrument, assets (liabilities) 38.5    
Gold price contracts      
Gain (Loss) Recognized in Cash Flow Hedge [Abstract]      
Unrealized gain (loss) recognized in cash flow hedge reserve 2.1 0.0  
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve 2.1 0.0  
Premiums paid 1.8 6.6  
Time value excluded from hedge relationship 8.8 (1.4)  
Other comprehensive income, before tax, cash flow hedges 1.0 $ 8.0 $ 0.0
Current portion of hedge asset 1.4    
Non-current portion of hedge asset 0.3    
Current portion of hedge liability 0.0    
Non-current portion of hedge liability (0.7)    
Hedging Instrument, assets (liabilities) $ 1.0