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Financial Risk Management - Market Risk - Foreign currency risk (Details)
€ in Millions, $ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
EUR (€)
Hedges of net investment in Canadian subsidiaries | Unsecured senior notes            
Financial Risk Management.            
Debt hedges     $ 700.0      
Foreign currency risk            
Net gains (losses) on investments:            
Investing activities $ (350.4) $ 111.4        
Underwriting activities 91.1 (170.2)        
Foreign currency contracts 234.1 (60.0)        
Foreign currency net losses (25.2) (118.8)        
Foreign currency risk | Hedges of net investment in Canadian subsidiaries | Unsecured senior notes            
Financial Risk Management.            
Debt hedges     $ 3,140.0   $ 2,788.6  
Debt hedges at fair value 2,207.0 2,061.1        
Gains (losses) on hedge of net investment in Canadian subsidiaries 173.9 (56.6)        
Foreign currency risk | Hedges of net investment in European operations | Unsecured senior notes            
Financial Risk Management.            
Debt hedges | €       € 750.0   € 750.0
Debt hedges at fair value 767.5 791.9        
Gains (losses) on hedge of net investment in Canadian subsidiaries $ 51.5 $ (27.8)