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LONG-TERM DEBT AND CREDIT FACILITY - Senior Notes (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 23, 2020 | Sep. 08, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 29, 2020
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowing costs capitalised |  |  | $ 31,400,000 | $ 24,500,000 |
Long-term debt |  |  | 450,000,000.0 | 450,000,000.0 |
Assets |  |  | 3,971,600,000 | 4,154,300,000 |
Loss on redemption of 7% senior notes |  |  | 0 | 22,500,000 |
Carrying Amount |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Assets |  |  | 728,600,000 | 1,078,100,000 |
Carrying Amount | Embedded derivative |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Assets |  |  | 1,500,000 | 8,400,000 |
5.75% senior notes |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount | $ 450,000,000 |  |  |  |
Borrowing costs capitalised | $ 7,500,000 |  |  |  |
Percentage of principal amount redeemed utilizing equity offering proceeds | 40.00% |  |  |  |
Redemption price percentage utilizing equity offering proceeds | 101.00% |  |  |  |
Long-term debt | $ 454,200,000 |  | $ 450,000,000.0 | $ 450,000,000.0 |
5.75% senior notes | Prior to October 15, 2023 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |
5.75% senior notes | October 15, 2023 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Redemption price percentage | 104.313% |  |  |  |
5.75% senior notes | October 15, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Redemption price percentage | 102.875% |  |  |  |
5.75% senior notes | October 15, 2025 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Redemption price percentage | 101.438% |  |  |  |
5.75% senior notes | October 15, 2026 and thereafter |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |
5.75% senior notes | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate | 5.75% |  | 5.75% | 5.75% |
7.0% Senior Notes |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowing redeemed |  |  |  |  | $ 421,300,000
Loss on redemption of 7% senior notes |  | $ 22,500,000 |  |  |
7.0% Senior Notes | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate |  | 7.00% |  | 7.00% |

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