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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

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