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FINANCIAL INSTRUMENTS - Maturity Date and Principal Amount of the Company's Obligations (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 1,612.2
2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 455.0
2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 34.1
2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 29.4
2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 1,093.7
Accounts payable and accrued liabilities  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 264.8
Accounts payable and accrued liabilities | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 264.8
Accounts payable and accrued liabilities | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Accounts payable and accrued liabilities | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Accounts payable and accrued liabilities | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Lease liabilities  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 124.2
Lease liabilities | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 38.1
Lease liabilities | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 33.0
Lease liabilities | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 29.4
Lease liabilities | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 23.7
Equipment loans  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 2.1
Equipment loans | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 1.0
Equipment loans | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 1.1
Equipment loans | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Equipment loans | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Credit facility  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 220.0
Credit facility | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Credit facility | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Credit facility | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Credit facility | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 220.0
Notes  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 450.0
Notes | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Notes | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Notes | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Notes | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 450.0
Gold sale prepayment arrangement  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 151.1
Gold sale prepayment arrangement | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 151.1
Gold sale prepayment arrangement | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Gold sale prepayment arrangement | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Gold sale prepayment arrangement | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Term Loan  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 400.0
Term Loan | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Term Loan | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Term Loan | 2027  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Term Loan | 2028 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 400.0