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Segment Reporting - Schedule of Segment Reporting Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Gross premiums written $ 553,401 $ 474,123 $ 1,878,645 $ 1,517,247
Net premiums written 477,896 383,566 1,467,843 1,116,772
Net premiums earned 448,795 337,036 1,252,862 952,398
Third party fee income 4,464 2,301 17,934 7,753
Losses and loss adjustment expenses 273,632 191,577 720,478 519,554
Acquisition costs 102,201 78,537 283,059 220,532
Other underwriting expenses 48,332 44,357 140,339 126,242
Underwriting income (loss) 29,094 24,866 126,920 93,823
Net realized and unrealized gains (losses) on investments 48,228 47,343 454,851 101,881
Net investment income (loss) 17,330 8,069 43,667 17,719
Other income (loss), excluding third party fee income   85   85
Net foreign exchange gains (losses) (5,973) 1,432 (9,883) (3,953)
Corporate expenses (14,060) (18,678) (41,825) (31,833)
Amortization of intangible assets (5,204) (2,794) (11,773) (7,869)
Interest expense (5,351) (5,288) (17,090) (16,007)
Income (loss) before income tax 64,064 55,035 544,867 153,846
Income tax expense (benefit) (3,029) (2,387) (6,118) (6,908)
Net income (loss) 61,035 52,648 538,749 146,938
Net income (loss) attributable to non-controlling interest (17,215) 9,065 172,240 15,076
Net income (loss) and other comprehensive income (loss) attributable to common shareholders $ 78,250 $ 43,583 $ 366,509 $ 131,862
Attritional loss ratio - current year 53.20% 54.80% 53.90% 51.80%
Attritional loss ratio - prior year development (0.70%) (0.10%) 0.60% (0.40%)
Catastrophe loss ratio - current year 11.50% 3.90% 4.10% 3.70%
Catastrophe loss ratio - prior year development (3.00%) (1.80%) (1.10%) (0.50%)
Loss and loss adjustment expense ratio 61.00% 56.80% 57.50% 54.60%
Acquisition cost ratio 22.80% 23.30% 22.60% 23.20%
Other underwriting expense ratio 9.80% 12.50% 9.80% 12.40%
Combined ratio 93.60% 92.60% 89.90% 90.20%
Operating Segments | International        
Segment Reporting Information [Line Items]        
Gross premiums written $ 325,525 $ 307,140 $ 957,981 $ 832,049
Net premiums written 268,106 234,621 687,444 553,687
Net premiums earned 225,244 178,632 637,700 504,784
Third party fee income 4,170 2,115 11,557 7,417
Losses and loss adjustment expenses 130,135 97,820 359,181 255,787
Acquisition costs 59,713 47,236 160,589 131,688
Other underwriting expenses 34,143 31,634 99,317 89,635
Underwriting income (loss) $ 5,423 $ 4,057 $ 30,170 $ 35,091
Attritional loss ratio - current year 55.30% 54.60% 54.60% 52.60%
Attritional loss ratio - prior year development (1.50%) (5.30%) 0.30% (4.30%)
Catastrophe loss ratio - current year 6.40% 5.10% 2.20% 2.20%
Catastrophe loss ratio - prior year development (2.40%) 0.40% (0.80%) 0.20%
Loss and loss adjustment expense ratio 57.80% 54.80% 56.30% 50.70%
Acquisition cost ratio 26.50% 26.40% 25.20% 26.10%
Other underwriting expense ratio 13.30% 16.50% 13.80% 16.30%
Combined ratio 97.60% 97.70% 95.30% 93.10%
Operating Segments | Bermuda        
Segment Reporting Information [Line Items]        
Gross premiums written $ 227,876 $ 166,983 $ 920,664 $ 685,198
Net premiums written 209,790 148,945 780,399 563,085
Net premiums earned 223,551 158,404 615,162 447,614
Third party fee income 294 186 6,377 336
Losses and loss adjustment expenses 143,497 93,757 361,297 263,767
Acquisition costs 42,488 31,301 122,470 88,844
Other underwriting expenses 14,189 12,723 41,022 36,607
Underwriting income (loss) $ 23,671 $ 20,809 $ 96,750 $ 58,732
Attritional loss ratio - current year 51.00% 55.10% 53.10% 50.80%
Attritional loss ratio - prior year development 0.00% 5.70% 0.80% 4.00%
Catastrophe loss ratio - current year 16.70% 2.60% 6.10% 5.40%
Catastrophe loss ratio - prior year development (3.50%) (4.20%) (1.30%) (1.30%)
Loss and loss adjustment expense ratio 64.20% 59.20% 58.70% 58.90%
Acquisition cost ratio 19.00% 19.80% 19.90% 19.80%
Other underwriting expense ratio 6.20% 7.90% 5.60% 8.10%
Combined ratio 89.40% 86.90% 84.20% 86.80%
Corporate        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Third party fee income 0 0 0 0
Losses and loss adjustment expenses 0 0 0 0
Acquisition costs 0 0 0 0
Other underwriting expenses 0 0 0 0
Underwriting income (loss) 0 0 0 0
Net realized and unrealized gains (losses) on investments 48,228 47,343 454,851 101,881
Net investment income (loss) 17,330 8,069 43,667 17,719
Other income (loss), excluding third party fee income   85   85
Net foreign exchange gains (losses) (5,973) 1,432 (9,883) (3,953)
Corporate expenses (14,060) (18,678) (41,825) (31,833)
Amortization of intangible assets (5,204) (2,794) (11,773) (7,869)
Interest expense (5,351) (5,288) (17,090) (16,007)
Income tax expense (benefit) (3,029) (2,387) (6,118) (6,908)
Net income (loss) attributable to non-controlling interest $ (17,215) $ 9,065 $ 172,240 $ 15,076