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FINANCIAL INSTRUMENTS - Maturity Date and Principal Amount of the Company's Obligations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
oz
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 1,547.8
2022 Prepay Arrangements  
Disclosure of detailed information about financial instruments [line items]  
Sales arrangement, deferred delivery, amount of ounces | oz 6,250
2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 590.8
2024 | 2022 Prepay Arrangements  
Disclosure of detailed information about financial instruments [line items]  
Sales arrangement, deferred delivery, amount of ounces | oz 143,750
2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 42.4
2025 | 2022 Prepay Arrangements  
Disclosure of detailed information about financial instruments [line items]  
Sales arrangement, deferred delivery, amount of ounces | oz 6,250
2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 27.0
2027 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 887.6
Accounts Payable And Accrued Liabilities  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 317.6
Accounts Payable And Accrued Liabilities | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 317.6
Accounts Payable And Accrued Liabilities | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
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 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Gold bullion option contracts per ounce  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 251.6
Gold bullion option contracts per ounce | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 240.7
Gold bullion option contracts per ounce | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 10.9
Gold bullion option contracts per ounce | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Gold bullion option contracts per ounce | 2027 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 121.3
Lease liabilities | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 27.6
Lease liabilities | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 29.9
Lease liabilities | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 26.2
Lease liabilities | 2027 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 37.6
Equipment loans  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 7.3
Equipment loans | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 4.9
Equipment loans | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 1.6
Equipment loans | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.8
Equipment loans | 2027 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 0.0
Credit Facility | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
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 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Senior Notes  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 450.0
Senior Notes | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Senior Notes | 2025  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Senior Notes | 2026  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
Senior Notes | 2027 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 450.0
Term Loan  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 400.0
Term Loan | 2024  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost 0.0
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 onwards  
Disclosure of detailed information about financial instruments [line items]  
Current financial assets at amortised cost $ 400.0