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Per Share Amounts - Additional Information (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Feb. 19, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of non-adjusting events after reporting period [line items]      
Total Preferred Share Dividends Declared   $ 36.0 $ 36.0
Common Shares      
Disclosure of non-adjusting events after reporting period [line items]      
Instruments excluded from calculation, value   $ 16.0 $ 0.0
Instruments excluded from calculation, shares (in shares)   9.8 1.6
Preferred Shares      
Disclosure of non-adjusting events after reporting period [line items]      
Total Preferred Share Dividends Declared   $ 45.0 $ 36.0
Preferred Shares | Potential ordinary share transactions      
Disclosure of non-adjusting events after reporting period [line items]      
Dividends declared (in CAD per share) $ 0.180    
Dividends declared $ 6.0