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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
Total
Ordinary shares
Preference shares
Additional paid-in capital
Retained earnings
Retained earnings
Ordinary shares
Cumulative foreign currency translation adjustments:
Unrealized appreciation on available for sale investments:
Gain on derivatives, net of taxes
Beginning balance at Dec. 31, 2020   $ 600,000 $ 753,500,000 $ 716,200,000 $ 1,397,200,000   $ (177,400,000) $ 192,500,000 $ 4,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Capital contribution $ 45,000,000.0                
Net income/(loss) for the year 29,800,000                
Dividends           $ 0      
Change for the year, net of income taxes             21,400,000 (157,900,000)  
Net change from current period hedged transactions (6,200,000)               (6,200,000)
Ending balance at Dec. 31, 2021 2,774,800,000 600,000 753,500,000 761,200,000 1,382,500,000   (156,000,000.0) 34,600,000 (1,600,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total accumulated other comprehensive (loss)/income (123,000,000.0)                
Aggregate liquidation preferences 775,000,000.0                
Capital contribution 0                
Net income/(loss) for the year 51,100,000                
Dividends           (40,000,000.0)      
Change for the year, net of income taxes             (30,900,000) (367,800,000)  
Net change from current period hedged transactions 15,400,000               15,400,000
Ending balance at Dec. 31, 2022 2,358,000,000 600,000 753,500,000 761,200,000 1,349,000,000   (186,900,000) (333,200,000) 13,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total accumulated other comprehensive (loss)/income (506,300,000)                
Aggregate liquidation preferences 775,000,000.0                
Change for the year, net of income taxes             (6,900,000) (34,500,000)  
Net change from current period hedged transactions                 (10,700,000)
Ending balance at Sep. 30, 2023 2,535,100,000 600,000 753,500,000 761,200,000 1,578,200,000   (193,800,000) (367,700,000) 3,100,000
Beginning balance at Dec. 31, 2022 2,358,000,000 600,000 753,500,000 761,200,000 1,349,000,000   (186,900,000) (333,200,000) 13,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Capital contribution 0                
Net income/(loss) for the year 534,700,000                
Dividends (49,865,700)         $ (40,300,000)      
Change for the year, net of income taxes             14,400,000 105,600,000  
Net change from current period hedged transactions (14,000,000.0)               (14,000,000.0)
Ending balance at Dec. 31, 2023 2,908,500,000 600,000 753,500,000 761,200,000 1,793,500,000   (172,500,000) (227,600,000) (200,000)
Beginning balance at Jun. 30, 2023   600,000 753,500,000 761,200,000 1,525,700,000   (179,300,000) (322,500,000) 9,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Change for the year, net of income taxes             (14,500,000) (45,200,000)  
Net change from current period hedged transactions                 (6,400,000)
Ending balance at Sep. 30, 2023 2,535,100,000 600,000 753,500,000 761,200,000 1,578,200,000   (193,800,000) (367,700,000) 3,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total accumulated other comprehensive (loss)/income (558,400,000)                
Aggregate liquidation preferences 775,000,000.0                
Ending balance at Dec. 31, 2023 2,908,500,000 600,000 753,500,000 761,200,000 1,793,500,000   (172,500,000) (227,600,000) (200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total accumulated other comprehensive (loss)/income (400,300,000)                
Aggregate liquidation preferences 775,000,000.0                
Change for the year, net of income taxes             20,900,000 90,500,000  
Net change from current period hedged transactions                 1,900,000
Ending balance at Sep. 30, 2024 3,023,200,000           (151,600,000) (137,100,000) 1,700,000
Beginning balance at Jun. 30, 2024   $ 600,000 $ 753,500,000 $ 761,200,000 $ 1,772,000,000   (174,100,000) (242,700,000) (400,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Change for the year, net of income taxes             22,500,000 105,600,000  
Net change from current period hedged transactions                 2,100,000
Ending balance at Sep. 30, 2024 3,023,200,000           $ (151,600,000) $ (137,100,000) $ 1,700,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total accumulated other comprehensive (loss)/income (287,000,000.0)                
Aggregate liquidation preferences $ 775,000,000.0