v3.25.4
Total Equity - Preferred Shares (Details)
$ / shares in Units, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2025
CAD ($)
$ / shares
shares
Dec. 31, 2024
$ / shares
Total Equity        
Redemption price per share | $ / shares     $ 25 $ 25
Dividends paid, other shares $ 24.5 $ 48.6    
Preferred shares        
Total Equity        
Stated capital 231.7 1,108.2    
Liquidation preference per share (in dollars per share) | $ / shares     $ 25  
Carrying value 876.5 227.3    
Redemption cost 689.4 173.8    
Gain recognized in equity (in net changes in capitalization) 187.1 53.5    
Dividends paid, other shares $ 24.5 $ 48.6    
Series C        
Total Equity        
Number of shares redeemed | shares   7,515,642    
Carrying value   $ 170.8    
Redemption cost   130.6    
Gain recognized in equity (in net changes in capitalization)   $ 40.2    
Series D        
Total Equity        
Number of shares redeemed | shares   2,484,358    
Carrying value   $ 56.5    
Redemption cost   43.2    
Gain recognized in equity (in net changes in capitalization)   $ 13.3    
Series E        
Total Equity        
Number of shares redeemed | shares 5,440,132      
Carrying value $ 124.5      
Redemption cost 94.5      
Gain recognized in equity (in net changes in capitalization) $ 30.0      
Series F        
Total Equity        
Number of shares redeemed | shares 2,099,046      
Carrying value $ 48.0      
Redemption cost 36.5      
Gain recognized in equity (in net changes in capitalization) $ 11.5      
Series G        
Total Equity        
Number of shares redeemed | shares 7,719,843      
Carrying value $ 182.1      
Redemption cost 138.7      
Gain recognized in equity (in net changes in capitalization) $ 43.4      
Series H        
Total Equity        
Number of shares redeemed | shares 2,280,157      
Carrying value $ 53.8      
Redemption cost 41.0      
Gain recognized in equity (in net changes in capitalization) $ 12.8      
Series I        
Total Equity        
Number of shares redeemed | shares 10,420,101      
Carrying value $ 250.5      
Redemption cost 190.1      
Gain recognized in equity (in net changes in capitalization) $ 60.4      
Series J        
Total Equity        
Number of shares redeemed | shares 1,579,899      
Carrying value $ 38.0      
Redemption cost 28.8      
Gain recognized in equity (in net changes in capitalization) $ 9.2      
Series K        
Total Equity        
Number of shares outstanding (in shares) | shares 9,500,000   9,500,000  
Stated capital $ 231.7   $ 237.5  
Liquidation preference per share (in dollars per share) | $ / shares     $ 25  
Fixed dividend rate per annum 5.05%      
Fixed dividend rate (Percent) 3.51%   3.51%  
Series L        
Total Equity        
Adjustment to floating rate basis for payment of dividends 3.51%   3.51%  
Series M        
Total Equity        
Number of shares redeemed | shares 9,200,000      
Carrying value $ 179.6      
Redemption cost 159.8      
Gain recognized in equity (in net changes in capitalization) $ 19.8