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FAIR VALUE MEASUREMENT - Summary of financial assets and liabilities by category (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Long-term debts [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | $ 707.7 | $ 652.9
Gold stream obligation [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 164.5 | 182.4
Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 83.4 | 103.7
Trade and other receivables [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 14.5 | 36.6
Investment [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.5 | 0.8
Proceeds due from income tax refunds at Mesquite [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 9.0 | 8.5
Deferred share units [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 1.1 | 0.3
Financial liabilities at amortised cost, category [member] | Long-term debts [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 714.5 | 780.5
Financial liabilities at amortised cost, category [member] | Trade and other receivables [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 111.3 | 101.3
Financial liabilities at fair value through profit or loss, category [member] | Level 1 of fair value hierarchy [member] | Restricted share units [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.5 | 0.3
Financial liabilities at fair value through profit or loss, category [member] | Level 1 of fair value hierarchy [member] | Deferred share units [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.0 | 0.3
Financial liabilities at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Gold price option contracts [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 26.4 | 4.8
Financial liabilities at fair value through profit or loss, category [member] | Level 3 of fair value hierarchy [member] | Gold stream obligation [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 164.5 | 182.4
Financial liabilities at fair value through profit or loss, category [member] | Level 3 of fair value hierarchy [member] | Performance Share Units [Member] |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.2 | 0.2
Financial assets at amortised cost, category [member] | Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 83.4 | 103.7
Financial assets at amortised cost, category [member] | Trade and other receivables [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 14.5 | 36.6
Financial assets at amortised cost, category [member] | Level 3 of fair value hierarchy [member] | Proceeds due from income tax refunds at Mesquite [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 9.0 | 8.5
Financial assets at fair value through profit or loss, category [member] | Level 1 of fair value hierarchy [member] | Investment [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.5 | 0.8
Financial assets at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Provisionally priced contracts [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 1.5 | (1.6)
Financial assets at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Gold and copper swap contracts [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | (1.3) | 0.9
Financial assets at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Copper price option contracts [Member] |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | $ 0.0 | $ 0.7

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