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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

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