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Property Casualty Loss and Loss Expense - Claims Development - Commercial Casualty (Details)
reported_claim in Thousands, $ in Thousands
Dec. 31, 2024
USD ($)
reported_claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, $ 3,589,000                  
Liabilities for loss and ALAE, net of reinsurance 9,416,000                  
Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 7,025,000                  
Cumulative paid losses and ALAE, net of reinsurance 3,921,000                  
All outstanding liabilities before, net of reinsurance 124,000                  
Liabilities for loss and ALAE, net of reinsurance 3,228,000                  
2015 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 520,000 $ 513,000 $ 496,000 $ 504,000 $ 502,000 $ 508,000 $ 516,000 $ 529,000 $ 526,000 $ 533,000
Total of incurred but not reported liabilities plus expected development on reported losses $ 14,000                  
Cumulative number of reported claims | reported_claim 22                  
Cumulative paid losses and ALAE, net of reinsurance $ 487,000 471,000 453,000 424,000 404,000 362,000 287,000 200,000 108,000 $ 38,000
2016 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 538,000 525,000 531,000 538,000 554,000 555,000 557,000 574,000 563,000  
Total of incurred but not reported liabilities plus expected development on reported losses $ 24,000                  
Cumulative number of reported claims | reported_claim 22                  
Cumulative paid losses and ALAE, net of reinsurance $ 498,000 485,000 466,000 434,000 395,000 331,000 228,000 126,000 $ 46,000  
2017 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 575,000 553,000 554,000 555,000 571,000 577,000 597,000 610,000    
Total of incurred but not reported liabilities plus expected development on reported losses $ 37,000                  
Cumulative number of reported claims | reported_claim 22                  
Cumulative paid losses and ALAE, net of reinsurance $ 512,000 486,000 437,000 392,000 320,000 234,000 122,000 $ 48,000    
2018 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 638,000 618,000 612,000 588,000 622,000 641,000 650,000      
Total of incurred but not reported liabilities plus expected development on reported losses $ 63,000                  
Cumulative number of reported claims | reported_claim 23                  
Cumulative paid losses and ALAE, net of reinsurance $ 542,000 505,000 441,000 345,000 253,000 148,000 $ 44,000      
2019 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 718,000 682,000 669,000 607,000 643,000 672,000        
Total of incurred but not reported liabilities plus expected development on reported losses $ 89,000                  
Cumulative number of reported claims | reported_claim 21                  
Cumulative paid losses and ALAE, net of reinsurance $ 576,000 503,000 394,000 259,000 134,000 $ 39,000        
2020 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 619,000 593,000 606,000 629,000 674,000          
Total of incurred but not reported liabilities plus expected development on reported losses $ 79,000                  
Cumulative number of reported claims | reported_claim 15                  
Cumulative paid losses and ALAE, net of reinsurance $ 437,000 345,000 242,000 102,000 $ 33,000          
2021 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 694,000 697,000 697,000 714,000            
Total of incurred but not reported liabilities plus expected development on reported losses $ 184,000                  
Cumulative number of reported claims | reported_claim 15                  
Cumulative paid losses and ALAE, net of reinsurance $ 370,000 251,000 123,000 $ 31,000            
2022 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 876,000 902,000 924,000              
Total of incurred but not reported liabilities plus expected development on reported losses $ 297,000                  
Cumulative number of reported claims 14                  
Cumulative paid losses and ALAE, net of reinsurance $ 311,000 141,000 $ 37,000              
2023 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 843,000 950,000                
Total of incurred but not reported liabilities plus expected development on reported losses $ 469,000                  
Cumulative number of reported claims | reported_claim 11                  
Cumulative paid losses and ALAE, net of reinsurance $ 146,000 $ 46,000                
2024 | Commercial Casualty Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,004,000                  
Total of incurred but not reported liabilities plus expected development on reported losses $ 792,000                  
Cumulative number of reported claims | reported_claim 8                  
Cumulative paid losses and ALAE, net of reinsurance $ 42,000