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Accumulated Other Comprehensive Loss, Net of Tax | 12 Months Ended
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Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract] |
Accumulated Other Comprehensive Loss, Net of Tax | ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAX:
|  | Year ended December 31
| Note | 2021 |  | 2022 |  | 2023
Opening balance of foreign currency translation account |  | $ | (10.3) |  |  | $ | (18.0) |  |  | $ | (24.7) |
Foreign currency translation adjustments |  | (7.7) |  |  | (6.7) |  |  | (3.4) |
Closing balance |  | (18.0) |  |  | (24.7) |  |  | (28.1) |
Opening balance of unrealized net gain (loss) on currency forward cash flow hedges |  | $ | 11.6 |  |  | $ | (1.9) |  |  | $ | 5.3 |
Net gain (loss) on currency forward cash flow hedges(i) |  | (5.3) |  |  | (5.9) |  |  | 2.6 |
Reclassification of net loss (gain) on currency forward cash flow hedges to operations(ii) |  | (8.2) |  |  | 13.1 |  |  | (4.4) |
Closing balance(iii) |  | (1.9) |  |  | 5.3 |  |  | 3.5 |
Opening balance of unrealized net gain (loss) on interest rate swap cash flow hedges |  | $ | (16.5) |  |  | $ | (6.9) |  |  | $ | 13.7 |
Net gain on interest rate swap cash flow hedges(iv) |  | 2.4 |  |  | 18.1 |  |  | 5.0 |
Reclassification of net loss (gain) on interest rate swap cash flow hedges to operations |  | 7.2 |  |  | 2.5 |  |  | (9.0) |
Closing balance(v) |  | (6.9) |  |  | 13.7 |  |  | 9.7 |
Actuarial gains (losses) on pension and non-pension post-employment benefit plans | 18 | $ | 9.3 |  |  | $ | 33.5 |  |  | $ | (7.6) |
Reclassification of actuarial losses (gains) to deficit |  | (9.3) |  |  | (33.5) |  |  | 7.6 |
Closing balance |  | — |  |  | — |  |  | — |
Accumulated other comprehensive loss |  | $ | (26.8) |  |  | $ | (5.7) |  |  | $ | (14.9) |
(i) Net of an income tax expense of nil for 2023 (2022 — net of a $1.6 income tax recovery; 2021 — net of a $0.5 income tax recovery). (ii) Including a $1.0 release in income tax recovery for 2023 (2022 — net of release of $2.2 in income tax recovery; 2021 — net of release of $0.6 in income tax expense) associated with the reclassification of net hedge (gain) loss to the consolidated statements of operations. (iii) Net of an income tax expense of $1.5 at December 31, 2023 (December 31, 2022 — net of a $0.5 income tax expense; December 31, 2021 — net of $0.1 in income tax recovery). (iv) Including an income tax recovery of $1.5 for 2023 (2022 — net of $5.0 in income tax expense; 2021 — net of nil income tax expense). (v) Net of an income tax expense of $3.5 at December 31, 2023 (December 31, 2022 — net of $5.0 in income tax expense; and December 31, 2021 — net of nil income tax expense).

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