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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Ordinary shares
Preference shares
Additional paid-in capital
Retained earnings
Cumulative foreign currency translation adjustments:
Gain on derivatives, net of taxes
Unrealized appreciation on available for sale investments:
Beginning balance at Dec. 31, 2020   $ 600 $ 753,500 $ 716,200 $ 1,397,200 $ (177,400) $ 4,600 $ 192,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Change for the year, net of income taxes           21,400   (157,900)
Net change from current period hedged transactions $ (6,200)           (6,200)  
Ending balance at Dec. 31, 2021 2,774,800 600 753,500 761,200 1,382,500 (156,000) (1,600) 34,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 29,800              
Preference share dividends (44,500)              
Total accumulated other comprehensive (loss)/income (123,000)              
Change for the year, net of income taxes           (30,900)   (367,800)
Net change from current period hedged transactions 15,400           15,400  
Ending balance at Dec. 31, 2022 2,358,000 600 753,500 761,200 1,349,000 (186,900) 13,800 (333,200)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 51,100              
Preference share dividends (44,600)              
Total accumulated other comprehensive (loss)/income (506,300)              
60,395,839 ordinary shares of par value $0.01 each (December 31, 2021 — 60,395,839 shares) 604              
Preference shares 753,500              
Additional paid in capital 761,200              
Retained earnings 1,349,000              
Dividends on ordinary shares         (40,000)      
Change for the year, net of income taxes           (6,900)   (34,500)
Net change from current period hedged transactions             (10,700)  
Ending balance at Sep. 30, 2023 2,535,100 600 753,500 761,200 1,578,200 (193,800) 3,100 (367,700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 305,200              
Preference share dividends         (36,000)      
Beginning balance at Dec. 31, 2022 2,358,000 600 753,500 761,200 1,349,000 (186,900) 13,800 (333,200)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Change for the year, net of income taxes           14,400   105,600
Net change from current period hedged transactions (14,000)           (14,000)  
Ending balance at Dec. 31, 2023 2,908,500 600 753,500 761,200 1,793,500 (172,500) (200) (227,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 534,700              
Preference share dividends (49,900)              
Beginning balance at Jun. 30, 2023   600 753,500 761,200 1,525,700 (179,300) 9,500 (322,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Dividends on ordinary shares         (20,000)      
Change for the year, net of income taxes           (14,500)   (45,200)
Net change from current period hedged transactions             (6,400)  
Ending balance at Sep. 30, 2023 2,535,100 600 753,500 761,200 1,578,200 (193,800) 3,100 (367,700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 86,300              
Preference share dividends         (13,800)      
Total accumulated other comprehensive (loss)/income (558,400)              
Total accumulated other comprehensive (loss)/income (400,300)              
60,395,839 ordinary shares of par value $0.01 each (December 31, 2021 — 60,395,839 shares) 604              
Preference shares 753,500              
Additional paid in capital 761,200              
Retained earnings 1,793,500              
Beginning balance at Dec. 31, 2023 2,908,500 600 753,500 761,200 1,793,500 (172,500) (200) (227,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Dividends on ordinary shares         (195,000)      
Change for the year, net of income taxes           20,900   90,500
Net change from current period hedged transactions             1,900  
Ending balance at Sep. 30, 2024 3,023,200         (151,600) 1,700 (137,100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 237,500              
Preference share dividends         (41,100)      
Beginning balance at Jun. 30, 2024   $ 600 $ 753,500 $ 761,200 1,772,000 (174,100) (400) (242,700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Dividends on ordinary shares         (20,000)      
Change for the year, net of income taxes           22,500   105,600
Net change from current period hedged transactions             2,100  
Ending balance at Sep. 30, 2024 3,023,200         $ (151,600) $ 1,700 $ (137,100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss)/income 56,700              
Preference share dividends         $ (13,800)      
Total accumulated other comprehensive (loss)/income (287,000)              
60,395,839 ordinary shares of par value $0.01 each (December 31, 2021 — 60,395,839 shares) 604              
Preference shares 753,500              
Additional paid in capital 761,200              
Retained earnings $ 1,794,900