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FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
DEBT COMMITMENTS |  |
Trade and other payables | $ 171.6 | $ 130.9
Outstanding borrowings | 714.5 | 780.5
Interest payable on long-term debt | 174.7 | 242.9
Gold stream obligation | 192.7 | 267.5
Total debt commitments | 1,247.7 | 1,423.0
Accounts Payable excluding current portion of Gold Stream Obligation [Member] |  |
DEBT COMMITMENTS |  |
Trade and other payables | 150.0 | 112.6
Principle of Long Term Debt [Member] |  |
DEBT COMMITMENTS |  |
Outstanding borrowings | 730.3 | $ 800.0
2020 |  |
DEBT COMMITMENTS |  |
Trade and other payables | 150.0 |
Outstanding borrowings | 0.0 |
Interest payable on long-term debt | 44.2 |
Gold stream obligation | 22.0 |
Total debt commitments | 216.2 |
Between 1 and 3 years |  |
DEBT COMMITMENTS |  |
Trade and other payables | 0.0 |
Outstanding borrowings | 430.3 |
Interest payable on long-term debt | 85.1 |
Gold stream obligation | 49.9 |
Total debt commitments | 565.3 |
2023 and thereafter |  |
DEBT COMMITMENTS |  |
Trade and other payables | 0.0 |
Interest payable on long-term debt | 38.3 |
Gold stream obligation | 54.9 |
Total debt commitments | 93.2 |
More than 5 years |  |
DEBT COMMITMENTS |  |
Trade and other payables | 0.0 |
Outstanding borrowings | 300.0 |
Interest payable on long-term debt | 7.1 |
Gold stream obligation | 65.9 |
Total debt commitments | $ 373.0 |

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