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Accumulated Other Comprehensive Loss, Net of Tax | 12 Months Ended
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Dec. 31, 2021
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 | 2019 |  | 2020 |  | 2021
Opening balance of foreign currency translation account |  | $ | (14.4) |  |  | $ | (14.6) |  |  | $ | (10.3) |
Foreign currency translation adjustments |  | (0.2) |  |  | 4.3 |  |  | (7.7) |
Closing balance |  | (14.6) |  |  | (10.3) |  |  | (18.0) |
Opening balance of unrealized net gain (loss) on currency forward cash flow hedges |  | $ | (7.7) |  |  | $ | 3.1 |  |  | $ | 11.6 |
Net gain (loss) on currency forward cash flow hedges(i) |  | 6.7 |  |  | 9.0 |  |  | (5.3) |
Reclassification of net loss (gain) on currency forward cash flow hedges to operations(ii) |  | 4.1 |  |  | (0.5) |  |  | (8.2) |
Closing balance(iii) |  | 3.1 |  |  | 11.6 |  |  | (1.9) |
Opening balance of unrealized net loss on interest rate swap cash flow hedges |  | $ | (4.4) |  |  | $ | (12.1) |  |  | $ | (16.5) |
Net gain (loss) on interest rate swap cash flow hedges |  | (10.2) |  |  | (12.8) |  |  | 2.4 |
Reclassification of net loss on interest rate swap cash flow hedges to operations |  | 2.5 |  |  | 8.4 |  |  | 7.2 |
Closing balance(iv) |  | (12.1) |  |  | (16.5) |  |  | (6.9) |
Actuarial gains (losses) on pension and non-pension post-employment benefit plans | 18 | $ | (8.7) |  |  | $ | (9.1) |  |  | $ | 9.3 |
Reclassification of actuarial losses (gains) to deficit |  | 8.7 |  |  | 9.1 |  |  | (9.3) |
Loss on purchase of pension annuities | 18 | — |  |  | (0.2) |  |  | — |
Reclassification of loss on purchase of pension annuities to deficit | 18 | — |  |  | 0.2 |  |  | — |
Closing balance |  | — |  |  | — |  |  | — |
Accumulated other comprehensive loss |  | $ | (23.6) |  |  | $ | (15.2) |  |  | $ | (26.8) |
(i) Net of income tax recovery of $0.5 for 2021 (2020 — net of $0.8 income tax expense; 2019 — net of $0.2 income tax expense). (ii) Net of release of $0.6 income tax expense associated with the reclassification of net hedge (gain) loss to the consolidated statements of operations for 2021 (2020 — net of nil income tax expense; 2019 — net of release of $0.5 of income tax benefit). (iii) Net of income tax recovery of $0.1 as of December 31, 2021 (December 31, 2020 — net of $1.0 of income tax expense; December 31, 2019 — net of $0.2 of income tax expense). (iv) No income tax impact as of December 31, 2021, December 31, 2020 or December 31, 2019.

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