v3.25.4
Income Taxes - Changes in net deferred income tax asset (liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 $ (1,389.0) $ (949.2)
Amounts recorded in the consolidated statement of earnings (201.9) (255.0)
Amounts recorded in total equity (49.1) (7.6)
Acquisitions of subsidiaries 4.0 (207.0)
Divestitures of non-insurance subsidiaries 21.3  
Foreign exchange effect and other 35.1 29.8
Balance - December 31 (1,579.6) (1,389.0)
Operating and capital losses    
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 254.1 313.4
Amounts recorded in the consolidated statement of earnings (19.8) (59.8)
Amounts recorded in total equity 6.3 5.8
Acquisitions of subsidiaries 15.8 10.7
Divestitures of non-insurance subsidiaries (8.8)  
Foreign exchange effect and other 3.6 (16.0)
Balance - December 31 251.2 254.1
Investments    
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 (767.5) (611.8)
Amounts recorded in the consolidated statement of earnings (440.6) (183.7)
Amounts recorded in total equity (33.2) 14.4
Acquisitions of subsidiaries   0.1
Divestitures of non-insurance subsidiaries 0.1  
Foreign exchange effect and other 52.4 13.5
Balance - December 31 (1,188.8) (767.5)
Insurance contracts and reinsurance contracts assets held    
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 (476.8) (358.0)
Amounts recorded in the consolidated statement of earnings 188.7 (119.0)
Acquisitions of subsidiaries   (0.3)
Foreign exchange effect and other 0.5 0.5
Balance - December 31 (287.6) (476.8)
Intangible assets    
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 (442.8) (308.3)
Amounts recorded in the consolidated statement of earnings (9.6) 36.3
Acquisitions of subsidiaries (9.7) (186.1)
Divestitures of non-insurance subsidiaries (13.3)  
Foreign exchange effect and other (15.4) 15.3
Balance - December 31 (490.8) (442.8)
Tax credits    
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 59.0 33.6
Amounts recorded in the consolidated statement of earnings (5.5) 25.5
Acquisitions of subsidiaries   (0.3)
Foreign exchange effect and other (0.7) 0.2
Balance - December 31 52.8 59.0
Other    
Reconciliation of changes in the net deferred income tax asset (liability)    
Balance - January 1 (15.0) (18.1)
Amounts recorded in the consolidated statement of earnings 84.9 45.7
Amounts recorded in total equity (22.2) (27.8)
Acquisitions of subsidiaries (2.1) (31.1)
Divestitures of non-insurance subsidiaries 43.3  
Foreign exchange effect and other (5.3) 16.3
Balance - December 31 $ 83.6 $ (15.0)