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FINANCIAL INSTRUMENTS - Cash Flow Hedge Fair Value Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | $ (1.9) | $ 23.5 | $ 64.0
Unrealized gain (loss) recognized in cash flow hedge reserve | (1.4) | 29.7 |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | (16.4) | (45.5) |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | (17.3) |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation | (0.2) | (17.3) |
Time value excluded from hedge relationship | (7.4) | (7.4) |
Current portion of hedge asset | 7.3 |  |
Non-current portion of hedge asset | 0.0 |  |
Current portion of hedge liability | (9.2) |  |
Non-current portion of hedge liability | 0.0 |  |
Hedging Instrument, assets (liabilities) | (1.9) |  |
Canadian dollar contracts |  |  |
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | 1.6 | 3.2 | 24.5
Unrealized gain (loss) recognized in cash flow hedge reserve | 2.9 | (13.1) |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | (4.4) | (7.2) |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | 0.0 |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation | 0.0 |  |
Time value excluded from hedge relationship | (0.1) | (1.0) |
Current portion of hedge asset | 1.6 |  |
Non-current portion of hedge asset | 0.0 |  |
Current portion of hedge liability | 0.0 |  |
Non-current portion of hedge liability | 0.0 |  |
Hedging Instrument, assets (liabilities) | 1.6 |  |
Oil contracts |  |  |
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | 5.7 | 20.4 | 38.5
Unrealized gain (loss) recognized in cash flow hedge reserve | (1.4) | 41.4 |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | (12.2) | (37.5) |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | (17.3) |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation | (0.2) |  |
Time value excluded from hedge relationship | (0.9) | (4.7) |
Current portion of hedge asset | 5.7 |  |
Non-current portion of hedge asset | 0.0 |  |
Current portion of hedge liability | 0.0 |  |
Non-current portion of hedge liability | 0.0 |  |
Hedging Instrument, assets (liabilities) | 5.7 |  |
Gold price contracts |  |  |
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | (9.2) | (0.1) | $ 1.0
Unrealized gain (loss) recognized in cash flow hedge reserve | (2.9) | 1.4 |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | 0.2 | (0.8) |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | 0.0 |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation | 0.0 |  |
Time value excluded from hedge relationship | (6.4) | $ (1.7) |
Current portion of hedge asset | 0.0 |  |
Non-current portion of hedge asset | 0.0 |  |
Current portion of hedge liability | (9.2) |  |
Non-current portion of hedge liability | 0.0 |  |
Hedging Instrument, assets (liabilities) | $ (9.2) |  |

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