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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, 2023
Dec. 31, 2022
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   $ 4,537.9 $ 4,425.1
Liabilities   (2,273.8) (2,218.3)
Borrowing costs capitalised   68.3 37.8
Unamortized Deferred Gains      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.9
Liabilities   0.0  
Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Borrowing costs capitalised $ 7.5    
Notes | Unamortized deferred transactions costs      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Borrowing costs capitalised   4.5 5.5
Term Loan | Unamortized deferred transactions costs      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Borrowing costs capitalised   8.2  
Equipment loans | Unamortized deferred transactions costs      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Borrowing costs capitalised   0.1 0.1
Carrying Amount      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   501.4 535.9
Liabilities   (871.8) (942.1)
Carrying Amount | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (9.2) (4.7)
Carrying Amount | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (0.1)
Carrying Amount | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (1.4) (11.2)
Carrying Amount | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (0.5) (1.8)
Carrying Amount | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (452.5) (453.1)
Carrying Amount | Long-term debt | Credit Facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (455.0)
Carrying Amount | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (400.9)  
Carrying Amount | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (7.3) (16.2)
Carrying Amount | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   367.1 407.8
Carrying Amount | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   90.5 56.3
Carrying Amount | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   14.2 6.1
Carrying Amount | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   2.0 2.0
Carrying Amount | Deferred consideration from the sale of Sadiola      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   15.2 19.6
Carrying Amount | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.6 3.3
Carrying Amount | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   5.7 36.2
Carrying Amount | Embedded derivative      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   5.1 0.0
Carrying Amount | Gold bullion contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     4.6
Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   501.4 535.9
Liabilities   (817.7) (841.1)
Recurring fair value measurement | Option contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (9.2) (4.7)
Recurring fair value measurement | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (0.1)
Recurring fair value measurement | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (1.4) (11.2)
Recurring fair value measurement | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (0.5) (1.8)
Recurring fair value measurement | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (388.3) (352.5)
Recurring fair value measurement | Long-term debt | Credit Facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (455.0)
Recurring fair value measurement | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (411.0)  
Recurring fair value measurement | Long-term debt | Equipment loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (7.3) (15.8)
Recurring fair value measurement | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   367.1 407.8
Recurring fair value measurement | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   90.5 56.3
Recurring fair value measurement | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   14.2 6.1
Recurring fair value measurement | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   2.0 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   15.2 19.6
Recurring fair value measurement | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   1.6 3.3
Recurring fair value measurement | Option contracts | Crude Oil Option Contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   5.7 36.2
Recurring fair value measurement | Embedded derivative      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   5.1  
Recurring fair value measurement | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     4.6
Recurring fair value measurement | Level 1      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   473.8 471.8
Liabilities   (388.3) (352.5)
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 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 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 0.0
Recurring fair value measurement | Level 1 | Long-term debt | Notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (388.3) (352.5)
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 | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   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 | Cash and cash equivalents      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   367.1 407.8
Recurring fair value measurement | Level 1 | Restricted cash      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   90.5 56.3
Recurring fair value measurement | Level 1 | Marketable securities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   14.2 5.7
Recurring fair value measurement | Level 1 | Bond fund investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   2.0 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 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 0.0
Recurring fair value measurement | Level 1 | Embedded derivative      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0  
Recurring fair value measurement | Level 1 | Gold bullion contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     0.0
Recurring fair value measurement | Level 2      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   12.4 44.1
Liabilities   (429.4) (488.6)
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) (4.7)
Recurring fair value measurement | Level 2 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (0.1)
Recurring fair value measurement | Level 2 | TARF      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (1.4) (11.2)
Recurring fair value measurement | Level 2 | Extendible forward arrangement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (0.5) (1.8)
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 | Credit Facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     (455.0)
Recurring fair value measurement | Level 2 | Long-term debt | Term Loan      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities   (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   (7.3) (15.8)
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 | 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 3.3
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 36.2
Recurring fair value measurement | Level 2 | Embedded derivative      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   5.1  
Recurring fair value measurement | Level 2 | Gold bullion contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     4.6
Recurring fair value measurement | Level 3      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   15.2 20.0
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 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 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 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 | Credit Facility      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Liabilities     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  
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 | 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 | 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 0.4
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   15.2 19.6
Recurring fair value measurement | Level 3 | Currency contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   0.0 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 0.0
Recurring fair value measurement | Level 3 | Embedded derivative      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets   $ 0.0  
Recurring fair value measurement | Level 3 | Gold bullion contracts | Gold bullion contracts      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Assets     $ 0.0