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CASH FLOW ITEMS - Reconciliation of Long-Term Debt Arising from Financing Activities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 23, 2020
Long-term debt |  |  |
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward] |  |  |
Beginning balance | $ 830.8 | $ 918.7 |
Draws | 280.0 | 400.0 |
Deferred transaction costs |  | (23.0) |
Repayments | (65.1) | (464.2) |
Non-cash changes: |  |  |
Amortization of deferred financing charges | 5.3 | 3.8 |
Foreign currency translation |  | 0.2 |
Change in fair value of embedded derivative | (21.6) | (4.1) |
Other | (0.5) | (0.6) |
Ending balance | 1,028.9 | 830.8 |
Equipment loans | Long-term debt |  |  |
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward] |  |  |
Beginning balance | 7.2 | 16.1 |
Draws | 0.0 | 0.0 |
Deferred transaction costs |  | 0.0 |
Repayments | (5.1) | (9.2) |
Non-cash changes: |  |  |
Amortization of deferred financing charges | 0.0 | 0.1 |
Foreign currency translation |  | 0.2 |
Change in fair value of embedded derivative | 0.0 | 0.0 |
Other | 0.0 | 0.0 |
Ending balance | $ 2.1 | 7.2 |
5.75% senior notes | Fixed interest rate |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |  |
Interest rate | 5.75% |  | 5.75%
5.75% senior notes | Long-term debt |  |  |
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward] |  |  |
Beginning balance | $ 448.0 | 447.6 |
Draws | 0.0 | 0.0 |
Deferred transaction costs |  | 0.0 |
Repayments | 0.0 | 0.0 |
Non-cash changes: |  |  |
Amortization of deferred financing charges | 0.9 | 0.9 |
Foreign currency translation |  | 0.0 |
Change in fair value of embedded derivative | 0.0 | 0.0 |
Other | (0.5) | (0.5) |
Ending balance | 448.4 | 448.0 |
Credit facility | Long-term debt |  |  |
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward] |  |  |
Beginning balance | 0.0 | 455.0 |
Draws | 280.0 | 0.0 |
Deferred transaction costs |  | 0.0 |
Repayments | (60.0) | (455.0) |
Non-cash changes: |  |  |
Amortization of deferred financing charges | 0.0 | 0.0 |
Foreign currency translation |  | 0.0 |
Change in fair value of embedded derivative | 0.0 | 0.0 |
Other | 0.0 | 0.0 |
Ending balance | $ 220.0 | 0.0 |
Term Loan | Fixed interest rate |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |  |
Interest rate | 8.25% |  |
Term Loan | Long-term debt |  |  |
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward] |  |  |
Beginning balance | $ 375.6 | 0.0 |
Draws | 0.0 | 400.0 |
Deferred transaction costs |  | (23.0) |
Repayments | 0.0 | 0.0 |
Non-cash changes: |  |  |
Amortization of deferred financing charges | 4.4 | 2.8 |
Foreign currency translation |  | 0.0 |
Change in fair value of embedded derivative | (21.6) | (4.1) |
Other | 0.0 | (0.1) |
Ending balance | $ 358.4 | $ 375.6 |

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