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Short Duration Contracts - Claims development - Insurance (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
claims
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 13,445,271                  
Insurance | Property, energy, marine and aviation                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,279,988                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,547,766                  
All outstanding liabilities before 2013, net of reinsurance 18,239                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 750,461                  
Insurance | Property, energy, marine and aviation | 2013                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 124,868 $ 125,813 $ 126,825 $ 128,157 $ 133,400 $ 134,473 $ 142,889 $ 148,622 $ 156,147 $ 158,548
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 124,402 124,381 124,227 122,894 125,014 121,779 119,649 110,432 84,680 32,216
Total of IBNR liabilities plus expected development on reported claims $ 27                  
Cumulative number of reported claims | claims 3,982                  
Insurance | Property, energy, marine and aviation | 2014                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 133,605 134,803 134,895 134,192 132,166 136,050 147,248 145,679 148,104  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 122,792 122,165 115,253 98,423 87,681 84,061 77,764 53,632 25,849  
Total of IBNR liabilities plus expected development on reported claims $ 1,674                  
Cumulative number of reported claims | claims 3,557                  
Insurance | Property, energy, marine and aviation | 2015                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 90,816 91,833 91,770 97,789 102,449 103,921 109,769 112,299    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 87,564 87,260 86,190 87,870 86,196 76,282 64,900 23,561    
Total of IBNR liabilities plus expected development on reported claims $ 2,654                  
Cumulative number of reported claims | claims 4,244                  
Insurance | Property, energy, marine and aviation | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 87,618 92,108 95,989 100,003 105,184 100,843 104,002      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 87,232 90,808 94,570 97,089 98,303 83,218 24,684      
Total of IBNR liabilities plus expected development on reported claims $ 61                  
Cumulative number of reported claims | claims 5,704                  
Insurance | Property, energy, marine and aviation | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 225,298 231,199 230,413 235,924 246,264 280,686        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 217,764 215,874 211,688 195,512 139,849 30,215        
Total of IBNR liabilities plus expected development on reported claims $ 3,268                  
Cumulative number of reported claims | claims 6,287                  
Insurance | Property, energy, marine and aviation | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 170,411 170,057 173,693 186,030 180,981          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 149,663 142,838 134,858 102,285 30,026          
Total of IBNR liabilities plus expected development on reported claims $ 7,177                  
Cumulative number of reported claims | claims 5,048                  
Insurance | Property, energy, marine and aviation | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 161,156 165,477 178,564 179,056            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 139,141 133,911 105,380 26,130            
Total of IBNR liabilities plus expected development on reported claims $ 4,162                  
Cumulative number of reported claims | claims 5,942                  
Insurance | Property, energy, marine and aviation | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 335,747 329,362 359,394              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 251,055 194,487 55,619              
Total of IBNR liabilities plus expected development on reported claims $ 28,330                  
Cumulative number of reported claims | claims 8,546                  
Insurance | Property, energy, marine and aviation | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 428,719 426,870                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 267,677 90,423                
Total of IBNR liabilities plus expected development on reported claims $ 54,746                  
Cumulative number of reported claims | claims 7,566                  
Insurance | Property, energy, marine and aviation | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 521,750                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 100,476                  
Total of IBNR liabilities plus expected development on reported claims $ 208,080                  
Cumulative number of reported claims | claims 8,965                  
Insurance | Third party occurrence business                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 4,677,656                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,755,958                  
All outstanding liabilities before 2013, net of reinsurance 263,297                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,184,995                  
Insurance | Third party occurrence business | 2013                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 263,430 270,110 269,297 272,385 274,246 281,637 301,622 306,572 296,668 282,852
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 192,159 184,444 174,591 164,090 149,012 122,045 101,153 71,335 29,215 6,840
Total of IBNR liabilities plus expected development on reported claims $ 43,148                  
Cumulative number of reported claims | claims 66,118                  
Insurance | Third party occurrence business | 2014                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 345,024 343,286 342,641 343,904 339,403 342,759 338,505 335,587 329,718  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 237,135 223,895 211,440 191,108 161,935 112,541 71,473 40,226 9,200  
Total of IBNR liabilities plus expected development on reported claims $ 60,263                  
Cumulative number of reported claims | claims 75,557                  
Insurance | Third party occurrence business | 2015                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 379,226 386,465 382,427 391,132 391,797 398,565 391,570 358,769    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 249,399 227,439 211,510 181,505 139,364 88,411 44,514 11,110    
Total of IBNR liabilities plus expected development on reported claims $ 75,540                  
Cumulative number of reported claims | claims 78,507                  
Insurance | Third party occurrence business | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 363,453 367,586 374,654 399,315 405,803 394,190 389,530      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 215,481 194,637 164,534 136,759 87,543 41,920 11,679      
Total of IBNR liabilities plus expected development on reported claims $ 93,800                  
Cumulative number of reported claims | claims 78,576                  
Insurance | Third party occurrence business | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 406,165 406,857 412,231 422,360 417,662 417,097        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 220,660 165,468 134,988 99,806 52,309 13,391        
Total of IBNR liabilities plus expected development on reported claims $ 114,603                  
Cumulative number of reported claims | claims 84,418                  
Insurance | Third party occurrence business | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 458,050 451,164 450,647 452,879 430,128          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 198,502 154,138 115,049 63,776 16,991          
Total of IBNR liabilities plus expected development on reported claims $ 156,700                  
Cumulative number of reported claims | claims 77,685                  
Insurance | Third party occurrence business | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 471,279 480,535 487,080 455,928            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 172,948 121,646 73,075 18,375            
Total of IBNR liabilities plus expected development on reported claims $ 195,283                  
Cumulative number of reported claims | claims 84,985                  
Insurance | Third party occurrence business | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 640,231 616,314 606,640              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 154,902 76,567 24,407              
Total of IBNR liabilities plus expected development on reported claims $ 309,019                  
Cumulative number of reported claims | claims 90,795                  
Insurance | Third party occurrence business | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 662,716 621,972                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 90,791 26,235                
Total of IBNR liabilities plus expected development on reported claims $ 431,302                  
Cumulative number of reported claims | claims 89,718                  
Insurance | Third party occurrence business | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 688,082                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 23,981                  
Total of IBNR liabilities plus expected development on reported claims $ 614,366                  
Cumulative number of reported claims | claims 70,380                  
Insurance | Third party claims-made business                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 3,759,343                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,854,161                  
All outstanding liabilities before 2013, net of reinsurance 86,120                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,991,302                  
Insurance | Third party claims-made business | 2013                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 281,584 273,607 271,156 281,642 290,852 294,372 320,177 324,044 320,266 301,608
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 253,570 246,813 245,423 238,730 216,984 197,861 179,261 137,857 87,386 19,007
Total of IBNR liabilities plus expected development on reported claims $ 14,639                  
Cumulative number of reported claims | claims 14,953                  
Insurance | Third party claims-made business | 2014                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 296,153 287,573 291,498 297,248 281,271 278,556 298,541 279,410 264,273  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 260,333 249,307 243,137 229,314 207,447 172,722 129,409 63,288 13,814  
Total of IBNR liabilities plus expected development on reported claims $ 21,206                  
Cumulative number of reported claims | claims 15,482                  
Insurance | Third party claims-made business | 2015                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 266,758 267,725 252,263 255,207 259,830 276,256 277,358 258,740    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 220,871 216,892 193,105 174,084 126,431 100,030 52,007 9,059    
Total of IBNR liabilities plus expected development on reported claims $ 18,198                  
Cumulative number of reported claims | claims 14,392                  
Insurance | Third party claims-made business | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 329,534 326,960 321,764 314,412 308,080 291,258 274,996      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 256,705 242,300 205,478 158,127 127,203 68,157 10,537      
Total of IBNR liabilities plus expected development on reported claims $ 29,356                  
Cumulative number of reported claims | claims 15,083                  
Insurance | Third party claims-made business | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 316,673 323,128 308,172 311,724 285,738 270,272        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 232,508 195,788 143,064 112,975 67,529 9,281        
Total of IBNR liabilities plus expected development on reported claims $ 45,042                  
Cumulative number of reported claims | claims 15,198                  
Insurance | Third party claims-made business | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 347,449 336,106 319,646 314,112 272,543          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 208,063 158,389 118,105 68,244 12,241          
Total of IBNR liabilities plus expected development on reported claims $ 61,612                  
Cumulative number of reported claims | claims 15,934                  
Insurance | Third party claims-made business | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 322,178 317,363 317,312 289,128            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 154,630 122,046 65,286 12,373            
Total of IBNR liabilities plus expected development on reported claims $ 93,422                  
Cumulative number of reported claims | claims 15,858                  
Insurance | Third party claims-made business | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 423,375 413,156 383,497              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 151,750 87,248 17,070              
Total of IBNR liabilities plus expected development on reported claims $ 187,245                  
Cumulative number of reported claims | claims 15,438                  
Insurance | Third party claims-made business | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 517,975 514,676                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 90,487 23,253                
Total of IBNR liabilities plus expected development on reported claims $ 351,736                  
Cumulative number of reported claims | claims 15,751                  
Insurance | Third party claims-made business | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 657,664                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 25,244                  
Total of IBNR liabilities plus expected development on reported claims $ 575,484                  
Cumulative number of reported claims | claims 18,190                  
Insurance | Multi-line and other specialty                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 4,849,348                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,655,902                  
All outstanding liabilities before 2013, net of reinsurance 22,275                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,215,721                  
Insurance | Multi-line and other specialty | 2013                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 244,191 245,069 245,825 248,634 253,271 251,894 263,928 263,631 272,335 264,243
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 238,257 238,321 237,293 236,375 234,330 225,324 213,461 180,428 150,925 $ 86,680
Total of IBNR liabilities plus expected development on reported claims $ 2,761                  
Cumulative number of reported claims | claims 86,371                  
Insurance | Multi-line and other specialty | 2014                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 310,977 309,061 310,051 313,221 317,197 318,268 318,453 325,705 301,548  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 295,896 294,630 293,131 291,727 281,195 267,079 234,267 196,899 $ 107,726  
Total of IBNR liabilities plus expected development on reported claims $ 3,968                  
Cumulative number of reported claims | claims 130,844                  
Insurance | Multi-line and other specialty | 2015                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 344,974 347,206 349,432 356,657 364,815 356,777 357,939 334,684    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 331,320 330,431 326,652 320,971 305,895 277,850 236,108 $ 138,153    
Total of IBNR liabilities plus expected development on reported claims $ 5,632                  
Cumulative number of reported claims | claims 170,579                  
Insurance | Multi-line and other specialty | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 408,716 408,004 409,987 416,108 427,829 430,976 408,686      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 390,350 385,314 379,305 362,823 341,789 304,743 $ 175,948      
Total of IBNR liabilities plus expected development on reported claims $ 8,616                  
Cumulative number of reported claims | claims 189,406                  
Insurance | Multi-line and other specialty | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 512,717 504,322 500,947 491,347 501,026 482,436        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 471,978 446,002 423,480 380,696 342,385 $ 181,102        
Total of IBNR liabilities plus expected development on reported claims $ 12,776                  
Cumulative number of reported claims | claims 229,570                  
Insurance | Multi-line and other specialty | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 564,693 565,116 562,848 564,563 512,406          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 508,649 479,824 442,643 389,047 $ 211,711          
Total of IBNR liabilities plus expected development on reported claims $ 21,722                  
Cumulative number of reported claims | claims 256,621                  
Insurance | Multi-line and other specialty | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 651,004 640,262 612,179 566,864            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 548,844 486,882 385,794 $ 211,970            
Total of IBNR liabilities plus expected development on reported claims $ 38,672                  
Cumulative number of reported claims | claims 250,441                  
Insurance | Multi-line and other specialty | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 515,016 569,123 618,340              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 358,967 309,106 $ 171,994              
Total of IBNR liabilities plus expected development on reported claims $ 87,261                  
Cumulative number of reported claims | claims 162,214                  
Insurance | Multi-line and other specialty | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 618,581 635,186                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 334,549 $ 156,992                
Total of IBNR liabilities plus expected development on reported claims $ 153,336                  
Cumulative number of reported claims | claims 113,165                  
Insurance | Multi-line and other specialty | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 678,479                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 177,092                  
Total of IBNR liabilities plus expected development on reported claims $ 425,107                  
Cumulative number of reported claims | claims 89,859