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FINANCIAL INSTRUMENTS - Cash Flow Hedge Fair Value Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | $ (9.8) | $ (1.9) | $ 23.5
Unrealized gain (loss) recognized in cash flow hedge reserve | (39.7) | (1.4) |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | 24.8 | (16.4) |
Realized time value related to premiums paid | 2.2 |  |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | (0.2) |
Time value excluded from hedge relationship | 4.8 | (7.4) |
Current portion of hedge asset | 0.0 |  |
Non-current portion of hedge asset | 0.0 |  |
Current portion of hedge liability | (9.1) |  |
Non-current portion of hedge liability | (0.7) |  |
Hedging Instrument, assets (liabilities) | (9.8) |  |
Canadian dollar contracts |  |  |
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | (9.8) | 1.6 | 3.2
Unrealized gain (loss) recognized in cash flow hedge reserve | (13.1) | 2.9 |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | 1.7 | (4.4) |
Realized time value related to premiums paid | 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 | 0.0 | (0.1) |
Current portion of hedge asset | 0.0 |  |
Non-current portion of hedge asset | 0.0 |  |
Current portion of hedge liability | (9.1) |  |
Non-current portion of hedge liability | (0.7) |  |
Hedging Instrument, assets (liabilities) | (9.8) |  |
Oil contracts |  |  |
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | 0.0 | 5.7 | 20.4
Unrealized gain (loss) recognized in cash flow hedge reserve | 1.6 | (1.4) |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | (7.2) | (12.2) |
Realized time value related to premiums paid | 0.0 |  |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | (0.2) |
Time value excluded from hedge relationship | (0.1) | (0.9) |
Current portion of hedge asset | 0.0 |  |
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) | 0.0 |  |
Gold price contracts |  |  |
Gain (Loss) Recognized in Cash Flow Hedge [Abstract] |  |  |
Total cash flow hedge assets | 0.0 | (9.2) | $ (0.1)
Unrealized gain (loss) recognized in cash flow hedge reserve | (28.2) | (2.9) |
Realized (gain) loss reclassified or adjusted from cash flow hedge reserve | 30.3 | 0.2 |
Realized time value related to premiums paid | 2.2 |  |
Unrealized (gain) loss reclassified or adjusted from cash flow hedge reserve due to hedge de-designation |  | 0.0 |
Time value excluded from hedge relationship | 4.9 | $ (6.4) |
Current portion of hedge asset | 0.0 |  |
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) | $ 0.0 |  |

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