v3.26.1
Consolidated Statements of Changes in Shareholders’ Equity (Unaudited) - USD ($)
$ in Millions
Total
Common shares
Common shares held in treasury, at cost
Additional paid-in capital
Accumulated other comprehensive income, net of tax
Retained earnings
Balance - beginning of period at Dec. 31, 2024   $ 1.2 $ (105.5) $ 2,044.6 $ 4.5 $ 503.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common shares repurchased and retired   (0.2)   (216.1)    
Repurchase of common shares     0.0      
Retirement of treasury shares     105.5      
Share compensation expense       2.9    
Shares withheld for employee taxes on restricted share unit vesting       (0.2)    
Unrealized gains/(losses) arising during the period, net of reclassification adjustment $ 28.2       28.2  
Net income/(loss) (22.8)         (22.8)
Dividends on common shares           (22.3)
Balance - end of period at Jun. 30, 2025 2,323.4 1.0 0.0 1,831.2 32.7 458.5
Balance - beginning of period at Mar. 31, 2025   1.1 (22.1) 1,940.5 22.0 449.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common shares repurchased and retired   (0.1)   (110.7)    
Repurchase of common shares     0.0      
Retirement of treasury shares     22.1      
Share compensation expense       1.6    
Shares withheld for employee taxes on restricted share unit vesting       (0.2)    
Unrealized gains/(losses) arising during the period, net of reclassification adjustment 10.7       10.7  
Net income/(loss)           19.7
Dividends on common shares           (11.1)
Balance - end of period at Jun. 30, 2025 2,323.4 1.0 0.0 1,831.2 32.7 458.5
Balance - beginning of period at Dec. 31, 2025   1.0 0.0 1,685.6 37.1 675.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common shares repurchased and retired   (0.2)   (279.3)    
Repurchase of common shares     0.0      
Retirement of treasury shares     0.0      
Share compensation expense       5.2    
Shares withheld for employee taxes on restricted share unit vesting       (1.6)    
Unrealized gains/(losses) arising during the period, net of reclassification adjustment (29.8)       (29.8)  
Net income/(loss) 152.4         152.4
Dividends on common shares           (25.8)
Balance - end of period at Jun. 30, 2026 2,220.5 0.8 0.0 1,409.9 7.3 802.5
Balance - beginning of period at Mar. 31, 2026   0.9 0.0 1,466.6 15.6 770.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common shares repurchased and retired   (0.1)   (60.0)    
Repurchase of common shares     0.0      
Retirement of treasury shares     0.0      
Share compensation expense       3.5    
Shares withheld for employee taxes on restricted share unit vesting       (0.2)    
Unrealized gains/(losses) arising during the period, net of reclassification adjustment (8.3)       (8.3)  
Net income/(loss)           44.4
Dividends on common shares           (12.7)
Balance - end of period at Jun. 30, 2026 $ 2,220.5 $ 0.8 $ 0.0 $ 1,409.9 $ 7.3 $ 802.5