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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preference shares
Common shares
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings
Beginning balance at Dec. 31, 2023   $ 750,000 $ 52,694 $ 2,144,459 $ (14,211) $ 6,522,016
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (485) (108,049)    
Issuance of performance share and restricted stock awards (Note 10)     212 12,587    
Change in redeemable noncontrolling interests       (76)    
Change in net unrealized gains (loss) on investments, net of tax $ 166       166  
Foreign currency translation adjustments, net of tax 636       636  
Net income (loss) 1,347,090          
Net (income) loss attributable to redeemable noncontrolling interests (469,558)         (469,558)
Dividends on common shares (Note 10) (40,900)         (40,898)
Dividends on preference shares (Note 10) (17,688)         (17,688)
Ending balance at Jun. 30, 2024 10,178,895 750,000 52,421 2,048,921 (13,409) 7,340,962
Beginning balance at Mar. 31, 2024   750,000 52,908 2,137,343 (13,778) 6,866,312
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (485) (108,049)    
Issuance of performance share and restricted stock awards (Note 10)     (2) 18,967    
Change in redeemable noncontrolling interests       660    
Change in net unrealized gains (loss) on investments, net of tax (183)       (183)  
Foreign currency translation adjustments, net of tax 552       552  
Net income (loss) 728,621          
Net (income) loss attributable to redeemable noncontrolling interests (224,731)         (224,731)
Dividends on common shares (Note 10)           (20,396)
Dividends on preference shares (Note 10) (8,844)         (8,844)
Ending balance at Jun. 30, 2024 10,178,895 750,000 52,421 2,048,921 (13,409) 7,340,962
Beginning balance at Dec. 31, 2024 10,574,012 750,000 50,181 1,512,435 (14,756) 8,276,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (3,046) (734,623)    
Issuance of performance share and restricted stock awards (Note 10)     235 13,477    
Change in redeemable noncontrolling interests       (285)    
Change in net unrealized gains (loss) on investments, net of tax (136)       (136)  
Foreign currency translation adjustments, net of tax 1,126       1,126  
Net income (loss) 1,138,429          
Net (income) loss attributable to redeemable noncontrolling interests (133,087)         (133,087)
Dividends on common shares (Note 10) (38,700)         (38,720)
Dividends on preference shares (Note 10) (17,688)         (17,688)
Ending balance at Jun. 30, 2025 10,799,694 750,000 47,370 791,004 (13,766) 9,225,086
Beginning balance at Mar. 31, 2025   750,000 48,928 1,146,653 (14,844) 8,417,766
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (1,554) (374,969)    
Issuance of performance share and restricted stock awards (Note 10)     (4) 19,665    
Change in redeemable noncontrolling interests       (345)    
Change in net unrealized gains (loss) on investments, net of tax 163       163  
Foreign currency translation adjustments, net of tax 915       915  
Net income (loss) 1,163,690          
Net (income) loss attributable to redeemable noncontrolling interests (328,339)         (328,339)
Dividends on common shares (Note 10)           (19,187)
Dividends on preference shares (Note 10) (8,844)         (8,844)
Ending balance at Jun. 30, 2025 $ 10,799,694 $ 750,000 $ 47,370 $ 791,004 $ (13,766) $ 9,225,086