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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 23, 2020
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   $ 5,374.4 $ 4,537.9
Liabilities   (1,973.7) (2,273.8)
Unamortized deferred transaction costs   77.8 68.3
Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Unamortized deferred transaction costs $ 7.5    
Notes | Unamortized deferred transactions costs      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Unamortized deferred transaction costs   3.6 4.5
Term Loan | Unamortized deferred transactions costs      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Unamortized deferred transaction costs   3.7 8.2
Equipment loans | Unamortized deferred transactions costs      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Unamortized deferred transaction costs     0.1
TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (1.4)
Carrying Amount      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   472.0 501.4
Liabilities   (1,084.7) (871.8)
Carrying Amount | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (9.2)
Carrying Amount | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (9.8)  
Carrying Amount | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (1.4)
Carrying Amount | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (0.5)
Carrying Amount | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (452.0) (452.5)
Carrying Amount | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (400.8) (400.9)
Carrying Amount | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (2.1) (7.3)
Carrying Amount | Long-term debt | Credit facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (220.0)  
Carrying Amount | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   347.5 367.1
Carrying Amount | Short-term investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.0  
Carrying Amount | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   68.4 90.5
Carrying Amount | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   10.3 14.2
Carrying Amount | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.0 2.0
Carrying Amount | Deferred consideration from the sale of Sadiola      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   17.1 15.2
Carrying Amount | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     1.6
Carrying Amount | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     5.7
Carrying Amount | Embedded derivative      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Carrying Amount | Embedded derivative | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.0
Carrying Amount | Embedded derivative | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   26.7 5.1
Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   472.0 501.4
Liabilities   (1,117.1) (817.7)
Recurring fair value measurement | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (9.2)
Recurring fair value measurement | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (9.8)  
Recurring fair value measurement | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (1.4)
Recurring fair value measurement | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (0.5)
Recurring fair value measurement | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (435.8) (388.3)
Recurring fair value measurement | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (449.2) (411.0)
Recurring fair value measurement | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (2.3) (7.3)
Recurring fair value measurement | Long-term debt | Credit facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (220.0) 0.0
Recurring fair value measurement | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   347.5 367.1
Recurring fair value measurement | Short-term investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.0  
Recurring fair value measurement | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   68.4 90.5
Recurring fair value measurement | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   10.3 14.2
Recurring fair value measurement | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.0 2.0
Recurring fair value measurement | Deferred consideration from the sale of Sadiola      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   17.1 15.2
Recurring fair value measurement | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     1.6
Recurring fair value measurement | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     5.7
Recurring fair value measurement | Embedded derivative | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0  
Recurring fair value measurement | Embedded derivative | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   26.7 5.1
Recurring fair value measurement | Level 1      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   428.2 473.8
Liabilities   (435.8) (388.3)
Recurring fair value measurement | Level 1 | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     0.0
Recurring fair value measurement | Level 1 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0  
Recurring fair value measurement | Level 1 | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     0.0
Recurring fair value measurement | Level 1 | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     0.0
Recurring fair value measurement | Level 1 | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (435.8) (388.3)
Recurring fair value measurement | Level 1 | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0 0.0
Recurring fair value measurement | Level 1 | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0 0.0
Recurring fair value measurement | Level 1 | Long-term debt | Credit facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0  
Recurring fair value measurement | Level 1 | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   347.5 367.1
Recurring fair value measurement | Level 1 | Short-term investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.0  
Recurring fair value measurement | Level 1 | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   68.4 90.5
Recurring fair value measurement | Level 1 | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   10.3 14.2
Recurring fair value measurement | Level 1 | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.0 2.0
Recurring fair value measurement | Level 1 | Deferred consideration from the sale of Sadiola      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 1 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.0
Recurring fair value measurement | Level 1 | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.0
Recurring fair value measurement | Level 1 | Embedded derivative | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 2      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   26.7 12.4
Liabilities   (681.3) (429.4)
Recurring fair value measurement | Level 2 | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (9.2)
Recurring fair value measurement | Level 2 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (9.8)  
Recurring fair value measurement | Level 2 | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (1.4)
Recurring fair value measurement | Level 2 | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (0.5)
Recurring fair value measurement | Level 2 | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0 0.0
Recurring fair value measurement | Level 2 | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (449.2) (411.0)
Recurring fair value measurement | Level 2 | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (2.3) (7.3)
Recurring fair value measurement | Level 2 | Long-term debt | Credit facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (220.0)  
Recurring fair value measurement | Level 2 | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 2 | Short-term investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0  
Recurring fair value measurement | Level 2 | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 2 | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 2 | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 2 | Deferred consideration from the sale of Sadiola      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 2 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     1.6
Recurring fair value measurement | Level 2 | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     5.7
Recurring fair value measurement | Level 2 | Embedded derivative | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   26.7 5.1
Recurring fair value measurement | Level 3      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   17.1 15.2
Liabilities   0.0 0.0
Recurring fair value measurement | Level 3 | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     0.0
Recurring fair value measurement | Level 3 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0  
Recurring fair value measurement | Level 3 | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     0.0
Recurring fair value measurement | Level 3 | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     0.0
Recurring fair value measurement | Level 3 | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0 0.0
Recurring fair value measurement | Level 3 | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0 0.0
Recurring fair value measurement | Level 3 | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0 0.0
Recurring fair value measurement | Level 3 | Long-term debt | Credit facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   0.0  
Recurring fair value measurement | Level 3 | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 3 | Short-term investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0  
Recurring fair value measurement | Level 3 | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 3 | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 3 | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 0.0
Recurring fair value measurement | Level 3 | Deferred consideration from the sale of Sadiola      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   17.1 15.2
Recurring fair value measurement | Level 3 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.0
Recurring fair value measurement | Level 3 | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.0
Recurring fair value measurement | Level 3 | Embedded derivative | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   $ 0.0 $ 0.0