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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Incurred and Paid Claims Development (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]                    
Incurred Claims and Claim Expenses, Net of Reinsurance $ 37,641,793                  
IBNR and ACR 12,815,513                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 21,163,689                  
Outstanding liabilities from accident year 2014 and prior, net of reinsurance 386,060                  
Adjustment for unallocated loss adjustment expenses 114,425                  
Unamortized fair value and other adjustments recorded in connection with acquisitions (156,488)                  
Liability for claims and claim expenses, net of reinsurance 16,822,101                  
Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 14,142,805                  
IBNR and ACR 3,171,483                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 9,266,497                  
Outstanding liabilities from accident year 2014 and prior, net of reinsurance 49,601                  
Adjustment for unallocated loss adjustment expenses 15,115                  
Unamortized fair value and other adjustments recorded in connection with acquisitions (34,183)                  
Liability for claims and claim expenses, net of reinsurance 4,906,841                  
Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 23,498,988                  
IBNR and ACR 9,644,030                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 11,897,192                  
Outstanding liabilities from accident year 2014 and prior, net of reinsurance 336,459                  
Adjustment for unallocated loss adjustment expenses 99,310                  
Unamortized fair value and other adjustments recorded in connection with acquisitions (122,305)                  
Liability for claims and claim expenses, net of reinsurance 11,915,260                  
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,485,686 $ 1,487,053 $ 1,489,897 $ 1,497,311 $ 1,494,406 $ 1,505,261 $ 1,527,011 $ 1,572,065 $ 1,603,613 $ 1,670,190
IBNR and ACR 51,310                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,430,775 1,417,548 1,391,122 1,353,866 1,303,717 1,239,336 1,137,612 1,009,810 787,860 456,673
Accident Year 2015 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 373,895 375,420 376,457 374,258 383,214 388,076 397,750 414,379 456,920 506,243
IBNR and ACR 511                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 370,585 369,874 365,875 362,864 360,172 356,090 344,855 322,118 277,662 141,410
Accident Year 2015 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,111,791 1,111,633 1,113,440 1,123,053 1,111,192 1,117,185 1,129,261 1,157,686 1,146,693 1,163,947
IBNR and ACR 50,799                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,060,190 1,047,674 1,025,247 991,002 943,545 883,246 792,757 687,692 510,198 $ 315,263
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,768,120 1,762,581 1,784,035 1,752,579 1,734,299 1,811,320 1,843,984 1,882,586 1,872,508  
IBNR and ACR 31,713                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,653,636 1,615,296 1,586,304 1,522,045 1,416,750 1,280,778 1,103,921 895,958 469,972  
Accident Year 2016 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 522,370 522,917 532,556 514,263 517,878 544,624 564,880 592,915 572,814  
IBNR and ACR 3,361                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 480,030 477,703 481,117 476,483 465,432 438,693 405,317 324,607 144,973  
Accident Year 2016 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,245,750 1,239,664 1,251,479 1,238,316 1,216,421 1,266,696 1,279,104 1,289,671 1,299,694  
IBNR and ACR 28,352                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,173,606 1,137,593 1,105,187 1,045,562 951,318 842,085 698,604 571,351 $ 324,999  
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 3,171,839 3,160,015 3,168,653 3,230,732 3,262,344 3,340,805 3,423,131 3,606,410    
IBNR and ACR 106,741                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 2,850,754 2,726,059 2,579,980 2,416,297 2,229,595 1,864,861 1,503,737 922,620    
Accident Year 2017 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,496,890 1,521,356 1,550,274 1,613,614 1,670,648 1,687,873 1,813,187 1,951,429    
IBNR and ACR 76,065                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,323,316 1,313,624 1,291,080 1,243,652 1,223,434 1,115,451 935,017 619,039    
Accident Year 2017 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,674,949 1,638,659 1,618,379 1,617,118 1,591,696 1,652,932 1,609,944 1,654,981    
IBNR and ACR 30,676                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,527,438 1,412,435 1,288,900 1,172,645 1,006,161 749,410 568,720 $ 303,581    
Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 2,980,818 2,965,944 2,926,168 2,934,773 3,065,222 3,132,829 2,912,949      
IBNR and ACR 178,549                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 2,382,009 2,238,238 2,118,511 1,900,077 1,593,543 1,190,862 672,825      
Accident Year 2018 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,072,994 1,098,897 1,147,450 1,158,452 1,286,032 1,348,628 1,271,912      
IBNR and ACR 64,246                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 853,609 852,022 917,391 872,831 838,513 675,404 453,864      
Accident Year 2018 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,907,824 1,867,047 1,778,718 1,776,321 1,779,190 1,784,201 1,641,037      
IBNR and ACR 114,303                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,528,400 1,386,216 1,201,120 1,027,246 755,030 515,458 $ 218,961      
Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 2,620,761 2,564,553 2,554,243 2,591,017 2,680,637 2,706,854        
IBNR and ACR 249,622                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 2,225,414 1,996,128 1,678,643 1,350,356 991,137 382,173        
Accident Year 2019 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 912,496 914,252 976,162 1,042,748 1,135,337 1,162,088        
IBNR and ACR 35,810                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 818,617 777,272 718,321 632,491 457,281 164,785        
Accident Year 2019 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,708,265 1,650,301 1,578,081 1,548,269 1,545,300 1,544,766        
IBNR and ACR 213,812                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,406,797 1,218,856 960,322 717,865 533,856 $ 217,388        
Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 4,301,296 4,370,007 4,397,548 4,392,922 4,393,340          
IBNR and ACR 761,291                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 3,239,789 2,795,075 2,323,405 1,810,464 756,409          
Accident Year 2020 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,972,883 2,010,634 2,076,315 2,075,320 1,966,826          
IBNR and ACR 265,855                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,517,898 1,332,331 1,139,605 878,467 284,033          
Accident Year 2020 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 2,328,413 2,359,373 2,321,233 2,317,602 2,426,514          
IBNR and ACR 495,436                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,721,891 1,462,744 1,183,800 931,997 $ 472,376          
Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 4,906,690 5,176,258 5,388,056 5,534,493            
IBNR and ACR 1,018,009                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 3,356,124 2,922,881 2,092,957 886,330            
Accident Year 2021 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 2,440,274 2,655,570 2,758,871 2,759,175            
IBNR and ACR 143,701                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,984,325 1,852,117 1,371,613 585,175            
Accident Year 2021 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 2,466,416 2,520,688 2,629,185 2,775,318            
IBNR and ACR 874,308                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,371,799 1,070,764 721,344 $ 301,155            
Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 5,128,208 5,627,982 5,902,647              
IBNR and ACR 2,231,524                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 2,260,464 1,446,448 280,032              
Accident Year 2022 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 2,045,341 2,431,989 2,544,022              
IBNR and ACR 597,038                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,157,016 764,636 76,656              
Accident Year 2022 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 3,082,867 3,195,993 3,358,625              
IBNR and ACR 1,634,486                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,103,448 681,812 $ 203,376              
Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 5,200,462 5,277,384                
IBNR and ACR 3,144,564                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 1,289,115 516,063                
Accident Year 2023 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,376,749 1,469,539                
IBNR and ACR 577,889                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 536,495 232,849                
Accident Year 2023 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 3,823,713 3,807,845                
IBNR and ACR 2,566,675                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 752,620 $ 283,214                
Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 6,077,913                  
IBNR and ACR 5,042,190                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 475,609                  
Accident Year 2024 | Property                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 1,928,913                  
IBNR and ACR 1,407,007                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance 224,606                  
Accident Year 2024 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred Claims and Claim Expenses, Net of Reinsurance 4,149,000                  
IBNR and ACR 3,635,183                  
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance $ 251,003