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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     (963) (214,342)    
Issuance of performance share and restricted stock awards (Note 10)     209 30,538    
Change in redeemable noncontrolling interests       (1,594)    
Change in net unrealized gains (loss) on investments, net of tax $ 250       250  
Foreign currency translation adjustments, net of tax 934       934  
Net income (loss) 2,979,753          
Net (income) loss attributable to redeemable noncontrolling interests (919,734)         (919,734)
Dividends on common shares (Note 10) (60,900)         (60,894)
Dividends on preference shares (Note 10) (26,531)         (26,531)
Ending balance at Sep. 30, 2024 11,242,584 750,000 51,940 1,959,061 (13,027) 8,494,610
Beginning balance at Jun. 30, 2024   750,000 52,421 2,048,921 (13,409) 7,340,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (478) (106,293)    
Issuance of performance share and restricted stock awards (Note 10)     (3) 17,951    
Change in redeemable noncontrolling interests       (1,518)    
Change in net unrealized gains (loss) on investments, net of tax 84       84  
Foreign currency translation adjustments, net of tax 298       298  
Net income (loss) 1,632,663          
Net (income) loss attributable to redeemable noncontrolling interests (450,176)         (450,176)
Dividends on common shares (Note 10)           (19,996)
Dividends on preference shares (Note 10) (8,843)         (8,843)
Ending balance at Sep. 30, 2024 11,242,584 750,000 51,940 1,959,061 (13,027) 8,494,610
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     (3,898) (939,174)    
Issuance of performance share and restricted stock awards (Note 10)     218 32,249    
Change in redeemable noncontrolling interests       (205)    
Change in net unrealized gains (loss) on investments, net of tax 65       65  
Foreign currency translation adjustments, net of tax 1,044       1,044  
Net income (loss) 2,470,139          
Net (income) loss attributable to redeemable noncontrolling interests (548,287)         (548,287)
Dividends on common shares (Note 10) (57,300)         (57,266)
Dividends on preference shares (Note 10) (26,531)         (26,531)
Ending balance at Sep. 30, 2025 11,502,366 750,000 46,501 605,305 (13,647) 10,114,207
Beginning balance at Jun. 30, 2025   750,000 47,370 791,004 (13,766) 9,225,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (852) (204,551)    
Issuance of performance share and restricted stock awards (Note 10)     (17) 18,772    
Change in redeemable noncontrolling interests       80    
Change in net unrealized gains (loss) on investments, net of tax 201       201  
Foreign currency translation adjustments, net of tax (82)       (82)  
Net income (loss) 1,331,710          
Net (income) loss attributable to redeemable noncontrolling interests (415,200)         (415,200)
Dividends on common shares (Note 10)           (18,546)
Dividends on preference shares (Note 10) (8,843)         (8,843)
Ending balance at Sep. 30, 2025 $ 11,502,366 $ 750,000 $ 46,501 $ 605,305 $ (13,647) $ 10,114,207