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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, 2018   $ 3,705.2 $ 87.3   $ (7.3) $ (1.4) $ (0.5) $ (1,184.9)
Changes in equity [abstract]                
Repurchase and cancellation of common shares (note 11)   (26.1)           14.7
Issuance of shares related to share-based compensation   7.0            
Issuance of shares related to dividend reinvestment and share purchase plan   0.0            
Share-based compensation     5.8          
Transfer from contributed surplus of share-based compensation redeemed   2.5 (2.5)          
Stock Issued During Period, Value, Issued Flow-through Share Agreement   5.9            
Stock Issued During Period, Value, Merger     (3.8)          
Stock Reclassified Due to Expiration of Warrants     3.9          
Realized gain on sale of equity securities, reclassified to deficit         0.0      
Unrealized gain on equity securities, net of taxes         2.5      
Dividends (note 11(f)) $ 15.6             (15.6)
Reclassification of realized gain on sale of equity securities, net of tax               0.0
Cancellation of unexchanged post-amalgamation shares   (1.2)           1.2
Net earnings 96.1             96.1
Hedging gains (losses) for hedge of group of items with offsetting risk positions           6.0 0.5  
Ending balance at Dec. 31, 2019 2,695.3 3,693.3 90.7 $ (0.2) (4.8) 4.6 0.0 (1,088.5)
Changes in equity [abstract]                
Repurchase and cancellation of common shares (note 11)   (10.7)           5.2
Issuance of shares related to share-based compensation   7.5            
Issuance of shares related to dividend reinvestment and share purchase plan   10.0            
Share-based compensation     4.1          
Transfer from contributed surplus of share-based compensation redeemed   2.8 (2.8)          
Stock Issued During Period, Value, Issued Flow-through Share Agreement   0.0            
Stock Issued During Period, Value, Merger     (3.5)          
Stock Reclassified Due to Expiration of Warrants     0.0          
Realized gain on sale of equity securities, reclassified to deficit         (6.6)      
Unrealized gain on equity securities, net of taxes         23.8      
Dividends (note 11(f)) 1.7             (25.6)
Reclassification of realized gain on sale of equity securities, net of tax               6.6
Cancellation of unexchanged post-amalgamation shares   0.0           0.0
Net earnings 144.2              
Hedging gains (losses) for hedge of group of items with offsetting risk positions           1.1 0.1  
Ending balance at Dec. 31, 2020 $ 2,851.5 $ 3,702.9 $ 88.5 $ 18.2 $ 12.4 $ 5.7 $ 0.1 $ (958.1)