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RESERVE FOR LOSSES AND LOSS EXPENSES - Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 10,565,875                  
Insurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 5,738,936                  
Insurance | Property                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 3,524,536                  
All outstanding liabilities before 2015, net of reinsurance 13,825                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 810,674                  
Insurance | Property | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 182,683 $ 180,576 $ 180,900 $ 176,079 $ 184,856 $ 178,566 $ 178,896 $ 165,268 $ 144,389 $ 67,399
Insurance | Property | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 260,805 256,535 250,353 252,951 248,118 248,054 240,568 204,637 82,296  
Insurance | Property | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 642,182 641,640 629,525 639,939 644,936 616,838 509,202 190,148    
Insurance | Property | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 576,747 567,762 581,594 564,129 554,132 461,816 218,293      
Insurance | Property | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 328,429 323,935 335,077 298,564 251,877 145,556        
Insurance | Property | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 553,239 523,474 474,714 420,774 181,138          
Insurance | Property | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 338,393 319,737 284,332 133,671            
Insurance | Property | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 323,805 259,261 96,815              
Insurance | Property | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 206,885 90,343                
Insurance | Property | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 111,368                  
Insurance | Accident and health                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 920,457                  
All outstanding liabilities before 2015, net of reinsurance 656                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 134,285                  
Insurance | Accident and health | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 59,820 59,672 61,775 61,684 61,032 61,163 60,154 59,293 56,263 31,140
Insurance | Accident and health | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 84,869 84,125 84,989 84,288 83,897 82,836 82,003 78,239 41,127  
Insurance | Accident and health | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 117,122 116,933 115,070 115,890 114,788 113,393 108,219 62,733    
Insurance | Accident and health | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 114,104 113,014 112,202 111,312 107,655 105,324 61,218      
Insurance | Accident and health | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 68,263 66,828 66,971 62,033 60,623 44,652        
Insurance | Accident and health | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 61,786 57,944 59,608 51,481 36,035          
Insurance | Accident and health | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 69,489 68,183 60,470 38,828            
Insurance | Accident and health | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 87,242 80,164 45,663              
Insurance | Accident and health | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 135,134 93,765                
Insurance | Accident and health | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 122,628                  
Insurance | Marine and aviation                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,392,415                  
All outstanding liabilities before 2015, net of reinsurance 13,787                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 795,884                  
Insurance | Marine and aviation | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 140,441 140,449 140,443 140,256 134,176 131,418 128,652 123,818 68,918 29,464
Insurance | Marine and aviation | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 96,224 97,321 96,663 93,576 91,648 89,721 82,738 50,881 22,868  
Insurance | Marine and aviation | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 198,539 193,220 181,766 178,013 169,479 137,887 104,908 34,748    
Insurance | Marine and aviation | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 199,341 193,550 181,261 169,862 156,641 121,096 46,694      
Insurance | Marine and aviation | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 189,630 176,353 168,768 143,642 101,596 53,526        
Insurance | Marine and aviation | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 131,309 117,734 105,145 83,545 44,330          
Insurance | Marine and aviation | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 144,284 106,333 68,306 26,424            
Insurance | Marine and aviation | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 138,256 99,980 29,699              
Insurance | Marine and aviation | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 91,653 36,159                
Insurance | Marine and aviation | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 62,738                  
Insurance | Cyber                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 492,859                  
All outstanding liabilities before 2015, net of reinsurance 7,614                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 370,549                  
Insurance | Cyber | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 45,318 45,432 43,635 42,515 39,470 30,865 28,501 25,544 15,333 5,572
Insurance | Cyber | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 24,054 24,054 23,207 23,136 21,333 18,502 14,141 4,637 1,348  
Insurance | Cyber | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 47,274 39,997 40,554 38,029 35,897 28,331 19,165 9,354    
Insurance | Cyber | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 26,263 18,329 19,226 14,790 9,874 7,327 2,171      
Insurance | Cyber | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 55,026 54,986 58,696 31,445 20,249 2,764        
Insurance | Cyber | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 102,650 81,129 62,548 49,529 17,700          
Insurance | Cyber | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 82,803 74,856 65,332 24,077            
Insurance | Cyber | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 52,479 37,446 7,796              
Insurance | Cyber | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 45,086 9,094                
Insurance | Cyber | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 11,906                  
Insurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 2,063,708                  
All outstanding liabilities before 2015, net of reinsurance 143,974                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 2,034,530                  
Insurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 253,620 247,794 223,040 211,577 199,105 169,386 138,151 110,043 51,028 14,128
Insurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 315,673 288,796 274,502 233,400 209,142 171,190 130,951 65,656 14,341  
Insurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 313,285 287,549 266,159 196,246 165,829 107,721 51,055 11,401    
Insurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 380,200 333,899 263,460 203,168 141,470 74,121 18,147      
Insurance | Professional lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 333,147 287,110 204,491 132,159 75,980 24,714        
Insurance | Professional lines | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 168,911 124,128 96,537 43,600 8,542          
Insurance | Professional lines | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 126,636 82,947 38,157 9,677            
Insurance | Professional lines | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 100,835 45,645 10,815              
Insurance | Professional lines | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 55,586 12,057                
Insurance | Professional lines | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 15,815                  
Insurance | Credit and political risk                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 221,818                  
All outstanding liabilities before 2015, net of reinsurance 5,977                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 184,012                  
Insurance | Credit and political risk | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 23,309 23,309 23,309 23,309 23,309 23,309 23,309 23,309 23,309 0
Insurance | Credit and political risk | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 25,705 25,705 25,705 25,705 25,705 25,705 25,705 25,705 0  
Insurance | Credit and political risk | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 5,940 8,514 10,237 10,786 11,573 9,138 3,985 397    
Insurance | Credit and political risk | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 22,928 23,362 19,486 11,376 15,299 13,300 5,327      
Insurance | Credit and political risk | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 53,948 54,747 56,682 53,489 46,227 15,859        
Insurance | Credit and political risk | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 50,018 50,349 55,084 88,017 9,416          
Insurance | Credit and political risk | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 12,683 8,207 (378) 2,769            
Insurance | Credit and political risk | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 7,007 8,096 2,798              
Insurance | Credit and political risk | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 16,261 2,738                
Insurance | Credit and political risk | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 4,019                  
Insurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,411,156                  
All outstanding liabilities before 2015, net of reinsurance 59,273                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,409,002                  
Insurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 166,225 162,235 158,595 150,293 140,484 119,836 92,350 39,394 22,200 5,436
Insurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 106,095 102,588 95,615 79,396 66,157 56,319 36,317 23,211 6,299  
Insurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 201,124 189,184 167,554 142,497 114,856 58,560 29,185 5,354    
Insurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 200,368 188,416 158,255 118,847 72,057 34,843 9,252      
Insurance | Liability | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 223,818 191,870 138,666 83,412 39,694 7,787        
Insurance | Liability | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 155,974 118,034 75,733 25,094 8,129          
Insurance | Liability | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 166,205 103,537 51,736 13,384            
Insurance | Liability | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 124,788 53,365 13,191              
Insurance | Liability | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 54,318 9,829                
Insurance | Liability | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 12,241                  
Reinsurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 4,826,939                  
Reinsurance | Accident and health                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,816,659                  
All outstanding liabilities before 2015, net of reinsurance 1,291                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 187,670                  
Reinsurance | Accident and health | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 92,314 92,328 93,599 93,787 92,362 91,895 91,789 88,583 77,212 23,392
Reinsurance | Accident and health | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 189,131 189,146 189,558 188,632 189,036 187,052 180,891 149,814 50,017  
Reinsurance | Accident and health | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 179,715 179,491 179,725 179,075 178,569 171,794 156,941 79,215    
Reinsurance | Accident and health | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 194,680 194,539 194,064 190,959 191,414 164,972 72,826      
Reinsurance | Accident and health | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 199,235 194,411 196,317 195,595 169,294 67,755        
Reinsurance | Accident and health | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 192,168 191,899 210,093 171,822 81,783          
Reinsurance | Accident and health | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 212,355 209,615 179,195 68,549            
Reinsurance | Accident and health | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 234,448 213,363 101,488              
Reinsurance | Accident and health | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 199,466 130,720                
Reinsurance | Accident and health | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 123,147                  
Reinsurance | Agriculture                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 892,449                  
All outstanding liabilities before 2015, net of reinsurance 162                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 177,971                  
Reinsurance | Agriculture | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 96,237 96,198 95,586 95,431 95,442 94,848 94,511 92,954 65,845 1,716
Reinsurance | Agriculture | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 108,609 108,915 108,364 108,324 108,564 109,092 107,559 61,772 9,489  
Reinsurance | Agriculture | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 133,133 136,431 137,255 137,308 138,468 137,338 124,429 7,444    
Reinsurance | Agriculture | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 144,073 143,905 138,233 141,607 135,514 127,449 5,115      
Reinsurance | Agriculture | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 179,673 177,587 178,098 174,094 154,426 28,854        
Reinsurance | Agriculture | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 55,589 55,182 54,101 47,254 17,454          
Reinsurance | Agriculture | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 48,518 45,895 32,715 2,952            
Reinsurance | Agriculture | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 75,383 55,371 15,344              
Reinsurance | Agriculture | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 47,580 14,591                
Reinsurance | Agriculture | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 3,654                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 290,512                  
All outstanding liabilities before 2015, net of reinsurance 3,706                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 149,344                  
Reinsurance | Marine and aviation | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 11,274 11,012 10,879 10,798 10,972 10,177 8,620 6,417 2,646 416
Reinsurance | Marine and aviation | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 34,605 34,223 34,013 33,422 32,375 29,664 25,747 18,704 2,626  
Reinsurance | Marine and aviation | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 39,064 37,610 36,708 36,600 33,578 28,664 23,370 2,674    
Reinsurance | Marine and aviation | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 39,599 37,601 34,252 30,639 24,223 10,815 1,776      
Reinsurance | Marine and aviation | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 72,288 67,673 52,675 34,246 27,031 10,672        
Reinsurance | Marine and aviation | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 32,332 29,316 23,525 16,455 3,983          
Reinsurance | Marine and aviation | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 27,671 20,118 12,160 5,407            
Reinsurance | Marine and aviation | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 24,732 18,402 7,732              
Reinsurance | Marine and aviation | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 6,902 1,472                
Reinsurance | Marine and aviation | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 2,045                  
Reinsurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 963,205                  
All outstanding liabilities before 2015, net of reinsurance 136,065                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 943,175                  
Reinsurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 199,230 183,371 169,894 151,960 131,185 111,504 79,127 41,440 13,502 3,134
Reinsurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 222,284 201,985 180,296 152,878 124,288 94,682 52,347 20,397 1,752  
Reinsurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 165,728 136,560 115,586 88,279 62,483 39,723 14,746 2,812    
Reinsurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 137,940 112,549 81,129 56,426 30,964 2,495 273      
Reinsurance | Professional lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 97,450 74,942 52,368 33,104 13,463 362        
Reinsurance | Professional lines | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 57,776 40,009 26,460 13,773 3,820          
Reinsurance | Professional lines | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 38,523 22,453 11,320 4,337            
Reinsurance | Professional lines | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 28,924 11,684 3,233              
Reinsurance | Professional lines | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 12,388 3,452                
Reinsurance | Professional lines | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 2,962                  
Reinsurance | Credit and surety                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 558,087                  
All outstanding liabilities before 2015, net of reinsurance 28,849                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 306,042                  
Reinsurance | Credit and surety | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 115,099 114,711 117,224 118,370 117,515 113,904 111,972 95,640 78,814 32,721
Reinsurance | Credit and surety | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 99,527 99,762 97,638 97,926 99,415 98,411 88,974 70,896 41,639  
Reinsurance | Credit and surety | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 100,954 100,308 99,473 96,569 98,480 87,088 71,362 37,018    
Reinsurance | Credit and surety | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 84,092 83,859 82,379 80,736 69,263 65,916 38,619      
Reinsurance | Credit and surety | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 46,199 46,442 44,277 42,248 29,432 19,163        
Reinsurance | Credit and surety | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 48,666 43,304 38,972 33,572 25,277          
Reinsurance | Credit and surety | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 18,726 16,768 8,909 4,460            
Reinsurance | Credit and surety | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 13,259 10,916 6,845              
Reinsurance | Credit and surety | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 20,167 10,314                
Reinsurance | Credit and surety | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 11,398                  
Reinsurance | Motor                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,538,085                  
All outstanding liabilities before 2015, net of reinsurance 262,566                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 934,447                  
Reinsurance | Motor | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 175,513 171,272 169,228 164,226 141,761 141,391 126,014 109,330 90,219 57,035
Reinsurance | Motor | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 202,406 193,160 184,773 177,453 153,840 141,526 124,192 101,425 60,117  
Reinsurance | Motor | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 266,624 256,263 238,380 215,552 193,899 159,573 130,330 71,292    
Reinsurance | Motor | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 273,683 254,645 234,853 210,849 201,610 138,377 83,155      
Reinsurance | Motor | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 257,423 238,617 219,950 198,344 182,006 89,950        
Reinsurance | Motor | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 134,082 125,200 113,316 94,350 43,468          
Reinsurance | Motor | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 104,602 92,381 74,997 41,657            
Reinsurance | Motor | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 63,668 51,509 35,075              
Reinsurance | Motor | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 44,970 25,966                
Reinsurance | Motor | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 15,114                  
Reinsurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,567,371                  
All outstanding liabilities before 2015, net of reinsurance 127,910                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,611,231                  
Reinsurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 178,276 166,279 151,506 141,135 130,417 108,548 80,691 54,372 27,432 7,266
Reinsurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 234,297 215,185 188,319 165,531 142,074 111,165 69,136 37,527 11,837  
Reinsurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 250,245 223,321 192,427 157,920 120,145 78,240 41,984 12,394    
Reinsurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 244,159 206,294 165,827 127,457 84,839 49,673 19,352      
Reinsurance | Liability | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 201,377 158,542 119,854 79,439 45,132 19,288        
Reinsurance | Liability | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 152,616 119,248 82,113 48,916 16,930          
Reinsurance | Liability | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 145,566 98,671 58,253 10,882            
Reinsurance | Liability | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 102,346 51,960 18,024              
Reinsurance | Liability | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 45,121 14,979                
Reinsurance | Liability | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 13,368                  
Reinsurance | Run-off lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 2,980,000                  
All outstanding liabilities before 2015, net of reinsurance 38,605                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 517,059                  
Reinsurance | Run-off lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 232,580 231,029 230,094 228,479 214,446 210,135 200,069 175,420 117,515 $ 46,281
Reinsurance | Run-off lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 252,695 250,127 251,662 246,337 239,689 225,752 195,162 137,032 $ 63,381  
Reinsurance | Run-off lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 672,949 661,617 650,897 615,721 591,946 533,804 419,762 $ 163,739    
Reinsurance | Run-off lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 546,510 538,362 517,408 471,002 419,373 326,092 $ 116,822      
Reinsurance | Run-off lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 329,517 315,548 291,464 256,712 199,958 $ 55,275        
Reinsurance | Run-off lines | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 429,759 383,462 316,569 234,874 $ 104,927          
Reinsurance | Run-off lines | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 341,460 292,521 230,145 $ 87,733            
Reinsurance | Run-off lines | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 133,777 101,413 $ 49,727              
Reinsurance | Run-off lines | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 29,381 $ 22,862                
Reinsurance | Run-off lines | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses $ 11,372