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Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | Share capital [Member] | Contributed Surplus [member] | Accumulated other comprehensive income (loss) [member] | Accumulated other comprehensive income (loss) [member] Equity securities [member] | Accumulated other comprehensive income (loss) [member] Currency hedging instruments [member] | Accumulated other comprehensive income (loss) [member] Fuel Hedging Instruments [Member] | Deficit [member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2020 |  | $ 3,702.9 | $ 88.5 |  | $ 12.4 | $ 5.7 | $ 0.1 | $ (958.1)
Changes in equity [abstract] |  |  |  |  |  |  |  |
Repurchase and cancellation of common shares (note 13a) |  | (14.9) |  |  |  |  |  | 3.2
Issuance of shares related to share-based compensation |  | 0.2 |  |  |  |  |  |
Issuance of shares related to dividend reinvestment and share purchase plan (note 13a) |  | 4.6 |  |  |  |  |  |
Issuance of shares related to employee share purchase plan |  | 0.0 |  |  |  |  |  |
Share-based compensation |  |  | 6.8 |  |  |  |  |
Transfer from contributed surplus of share-based compensation redeemed |  | 0.1 | (0.1) |  |  |  |  |
Stock Issued During Period, Value, Issued Flow-through Share Agreement |  | 0.0 |  |  |  |  |  |
Stock Issued During Period, Value, Merger |  |  | (5.7) |  |  |  |  |
Realized gain on sale of equity securities, reclassified to deficit |  |  |  |  | (12.0) |  |  |
Unrealized loss on equity securities, net of taxes |  |  |  |  | (2.9) |  |  |
Dividends (note 13(f)) | $ (34.5) | (4.6) |  |  |  |  |  | (39.1)
Reclassification of realized gain on sale of equity securities, net of tax |  |  |  |  |  |  |  | 12.0
Net earnings (loss) | (66.7) |  |  |  |  |  |  | (66.7)
Hedging gains (losses) for hedge of group of items with offsetting risk positions |  |  |  |  |  | (1.7) | 0.3 |
Ending balance at Dec. 31, 2021 | 2,735.6 | 3,692.9 | 89.5 | $ 1.9 | (2.5) | 4.0 | 0.4 | (1,048.7)
Changes in equity [abstract] |  |  |  |  |  |  |  |
Repurchase and cancellation of common shares (note 13a) |  | (10.4) |  |  |  |  |  | 2.2
Issuance of shares related to share-based compensation |  | 5.3 |  |  |  |  |  |
Issuance of shares related to dividend reinvestment and share purchase plan (note 13a) |  | 4.1 |  |  |  |  |  |
Issuance of shares related to employee share purchase plan |  | 2.7 |  |  |  |  |  |
Share-based compensation |  |  | 5.5 |  |  |  |  |
Transfer from contributed surplus of share-based compensation redeemed |  | 2.3 | (2.3) |  |  |  |  |
Stock Issued During Period, Value, Issued Flow-through Share Agreement |  | 6.9 |  |  |  |  |  |
Stock Issued During Period, Value, Merger |  |  | (2.0) |  |  |  |  |
Realized gain on sale of equity securities, reclassified to deficit |  |  |  |  | 0.0 |  |  |
Unrealized loss on equity securities, net of taxes |  |  |  |  | (20.5) |  |  |
Dividends (note 13(f)) |  |  |  |  |  |  |  | (39.2)
Reclassification of realized gain on sale of equity securities, net of tax |  |  |  |  |  |  |  | 0.0
Net earnings (loss) | 37.1 |  |  |  |  |  |  | 37.1
Hedging gains (losses) for hedge of group of items with offsetting risk positions |  |  |  |  |  | (5.9) | (0.3) |
Ending balance at Dec. 31, 2022 | $ 2,721.1 | $ 3,703.8 | $ 90.7 | $ (24.8) | $ (23.0) | $ (1.9) | $ 0.1 | $ (1,048.6)

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