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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 23, 2020 | Jun. 27, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | May 12, 2020
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | $ 3,971,600,000 | $ 4,154,300,000 |
Liabilities |  |  | (1,654,500,000) | (1,608,800,000) |
Borrowing costs capitalised |  |  | 31,400,000 | 24,500,000 |
Unamortized Deferred Gains |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,900,000 |  |
5.75% senior notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Borrowing costs capitalised | $ 7,500,000 |  |  |  |
5.75% senior notes | Unamortized deferred transactions costs |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Borrowing costs capitalised |  |  | 6,300,000 | 7,200,000 |
Equipment loans |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Interest rate |  | 5.23% |  |  | 5.95%
Borrowing costs capitalised |  | $ 300,000 |  |  |
Equipment loans | Unamortized deferred transactions costs |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Borrowing costs capitalised |  |  | 200,000 | 200,000 |
Carrying Amount |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 728,600,000 | 1,078,100,000 |
Liabilities |  |  | (505,300,000) | (517,700,000) |
Carrying Amount | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (3,000,000.0) |  |
Carrying Amount | Option contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | (12,000,000.0) |
Carrying Amount | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (700,000) |  |
Carrying Amount | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (29,200,000) | (23,300,000) |
Carrying Amount | Long-term debt | 5.75% senior notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (453,500,000) |  |
Carrying Amount | Long-term debt | Equipment loans |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (18,900,000) | (28,200,000) |
Carrying Amount | Long-term debt | 7.0% Senior Notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | (454,200,000) |
Carrying Amount | Cash and cash equivalents |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 544,900,000 | 941,500,000 |
Carrying Amount | Short-term investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 7,600,000 | 6,000,000.0 |
Carrying Amount | Restricted cash |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 42,200,000 | 38,600,000 |
Carrying Amount | Marketable securities and warrants |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 40,400,000 | 16,400,000 |
Carrying Amount | Bond fund investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 4,700,000 | 6,200,000 |
Carrying Amount | Deferred consideration from the sale of Sadiola |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 18,900,000 | 14,300,000 |
Carrying Amount | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 24,500,000 | 35,100,000 |
Carrying Amount | Option contracts | Oil contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 38,500,000 | 3,500,000 |
Carrying Amount | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,700,000 | 8,100,000 |
Carrying Amount | Extendible forward arrangement |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 3,700,000 |  |
Carrying Amount | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,500,000 | 8,400,000 |
Recurring fair value measurement |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 728,600,000 | 1,078,100,000 |
Liabilities |  |  | (498,000,000.0) | (524,600,000) |
Recurring fair value measurement | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (3,000,000) | 0 |
Recurring fair value measurement | Option contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (700,000) | (12,000,000.0) |
Recurring fair value measurement | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (29,200,000) | (23,300,000) |
Recurring fair value measurement | Long-term debt | 5.75% senior notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (446,000,000.0) |  |
Recurring fair value measurement | Long-term debt | Equipment loans |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (19,100,000) | (28,900,000) |
Recurring fair value measurement | Long-term debt | 7.0% Senior Notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | (460,400,000) |
Recurring fair value measurement | Cash and cash equivalents |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 544,900,000 | 941,500,000 |
Recurring fair value measurement | Short-term investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 7,600,000 | 6,000,000.0 |
Recurring fair value measurement | Restricted cash |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 42,200,000 | 38,600,000 |
Recurring fair value measurement | Marketable securities and warrants |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 40,400,000 | 16,400,000 |
Recurring fair value measurement | Bond fund investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 4,700,000 | 6,200,000 |
Recurring fair value measurement | Deferred consideration from the sale of Sadiola |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 18,900,000 | 14,300,000 |
Recurring fair value measurement | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 24,500,000 | 35,100,000 |
Recurring fair value measurement | Option contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,700,000 | 8,100,000 |
Recurring fair value measurement | Option contracts | Oil contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 38,500,000 | 3,500,000 |
Recurring fair value measurement | Extendible forward arrangement |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 3,700,000 |  |
Recurring fair value measurement | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,500,000 | 8,400,000 |
Recurring fair value measurement | Level 1 |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 639,400,000 | 1,008,300,000 |
Liabilities |  |  | (446,000,000.0) | (460,400,000) |
Recurring fair value measurement | Level 1 | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 |  |
Recurring fair value measurement | Level 1 | Option contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | 0 |
Recurring fair value measurement | Level 1 | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 |  |
Recurring fair value measurement | Level 1 | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 | 0 |
Recurring fair value measurement | Level 1 | Long-term debt | 5.75% senior notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (446,000,000.0) |  |
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 |
Recurring fair value measurement | Level 1 | Long-term debt | 7.0% Senior Notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | (460,400,000) |
Recurring fair value measurement | Level 1 | Cash and cash equivalents |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 544,900,000 | 941,500,000 |
Recurring fair value measurement | Level 1 | Short-term investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 7,600,000 | 6,000,000.0 |
Recurring fair value measurement | Level 1 | Restricted cash |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 42,200,000 | 38,600,000 |
Recurring fair value measurement | Level 1 | Marketable securities and warrants |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 40,000,000.0 | 16,000,000.0 |
Recurring fair value measurement | Level 1 | Bond fund investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 4,700,000 | 6,200,000 |
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 |
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 | Oil contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 0 | 0 |
Recurring fair value measurement | Level 1 | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 0 | 0 |
Recurring fair value measurement | Level 1 | Extendible forward arrangement |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 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 2 |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 69,900,000 | 55,100,000 |
Liabilities |  |  | (52,000,000.0) | (64,200,000) |
Recurring fair value measurement | Level 2 | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (3,000,000.0) |  |
Recurring fair value measurement | Level 2 | Option contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | (12,000,000.0) |
Recurring fair value measurement | Level 2 | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (700,000) |  |
Recurring fair value measurement | Level 2 | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (29,200,000) | (23,300,000) |
Recurring fair value measurement | Level 2 | Long-term debt | 5.75% senior notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 |  |
Recurring fair value measurement | Level 2 | Long-term debt | Equipment loans |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | (19,100,000) | (28,900,000) |
Recurring fair value measurement | Level 2 | Cash and cash equivalents |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 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 |
Recurring fair value measurement | Level 2 | Marketable securities and warrants |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 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 |
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 |
Recurring fair value measurement | Level 2 | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 24,500,000 | 35,100,000 |
Recurring fair value measurement | Level 2 | Option contracts | Oil contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 38,500,000 | 3,500,000 |
Recurring fair value measurement | Level 2 | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,700,000 | 8,100,000 |
Recurring fair value measurement | Level 2 | Extendible forward arrangement |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 3,700,000 |  |
Recurring fair value measurement | Level 2 | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 1,500,000 | 8,400,000 |
Recurring fair value measurement | Level 3 |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 19,300,000 | 14,700,000 |
Liabilities |  |  | 0 | 0 |
Recurring fair value measurement | Level 3 | Currency contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 |  |
Recurring fair value measurement | Level 3 | Option contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  |  | 0 |
Recurring fair value measurement | Level 3 | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 |  |
Recurring fair value measurement | Level 3 | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 0 | 0 |
Recurring fair value measurement | Level 3 | Long-term debt | 5.75% senior notes |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Liabilities |  |  | 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 |
Recurring fair value measurement | Level 3 | Cash and cash equivalents |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 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 |
Recurring fair value measurement | Level 3 | Marketable securities and warrants |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 400,000 | 400,000 |
Recurring fair value measurement | Level 3 | Bond fund investments |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 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 |  |  | 18,900,000 | 14,300,000 |
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 | Oil contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 0 | 0 |
Recurring fair value measurement | Level 3 | Option contracts | Gold price contracts |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 0 | 0 |
Recurring fair value measurement | Level 3 | Extendible forward arrangement |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | 0 |  |
Recurring fair value measurement | Level 3 | Embedded derivative |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |
Assets |  |  | $ 0 | $ 0 |

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