v3.26.1
Share-based compensation (Schedule of number and weighted average exercise prices of other equity instruments) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
$ / shares
Dec. 31, 2025
USD ($)
Share
Dec. 31, 2024
$ / shares
Dec. 31, 2024
USD ($)
Share
Deferred Share Unit [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of units, beginning of year   1,519,500   1,571,160
Number of units granted during the year   91,613   143,527
Credits for dividends   1,896   0
Number of units released/paid   (534,133)   (195,187)
Number of units, end of year   1,078,876   1,519,500
Weighted average price (C$/unit) | $ / shares $ 13.28   $ 10.05  
Expenses recognized during the year | $   $ 13.9   $ 6.3
Payments made during the year | $   $ 5.4   $ 1.6
Restricted Share Unit [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of units, beginning of year   2,223,237   1,787,728
Number of units granted during the year   691,843   984,758
Credits for dividends   2,714   4,618
Number of units forfeited during the year   (155,864)   (158,125)
Number of units released/paid   (889,851)   (395,742)
Number of units, end of year   1,872,079   2,223,237
Weighted average price (C$/unit) | $ / shares 12.03   7.56  
Expenses recognized during the year | $   $ 20.3   $ 6.7
Payments made during the year | $   $ 6.3   $ 2.2
Performance Share Unit [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of units, beginning of year   1,446,197   1,172,803
Number of units granted during the year   426,775   600,572
Number of units added by performance factor   183,152   0
Credits for dividends   2,142   2,997
Number of units forfeited during the year   (72,299)   (169,436)
Number of units released/paid   (490,455)   (160,739)
Number of units, end of year   1,495,512   1,446,197
Weighted average price (C$/unit) | $ / shares $ 12.05   $ 7.35  
Expenses recognized during the year | $   $ 24.6   $ 4.2
Payments made during the year | $   $ 3.5   $ 0.9