RESERVE FOR LOSSES AND LOSS EXPENSES - Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) $ in Thousands	Dec. 31, 2024 USD ($) claim	Dec. 31, 2023 USD ($)	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 ($)	Dec. 31, 2015 USD ($)
Insurance | Property
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 4,321,385
Insurance | Property | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	184,012	$ 180,785	$ 180,172	$ 177,908	$ 187,860	$ 186,032	$ 189,373	$ 191,577	$ 199,448	$ 207,189
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,053
Cumulative number of reported claims | claim	4,199
Insurance | Property | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 260,698	261,379	256,192	256,766	256,514	262,436	276,891	284,462	261,565
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ (854)
Cumulative number of reported claims | claim	6,685
Insurance | Property | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 662,072	663,510	668,986	668,663	673,336	682,582	694,953	789,318
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 11,091
Cumulative number of reported claims | claim	10,117
Insurance | Property | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 585,484	591,064	600,469	601,674	608,937	629,218	600,141
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 5,167
Cumulative number of reported claims | claim	9,701
Insurance | Property | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 343,852	343,816	360,367	349,495	357,615	368,594
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,904
Cumulative number of reported claims | claim	9,630
Insurance | Property | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 590,238	584,608	575,827	627,229	644,750
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 15,480
Cumulative number of reported claims | claim	12,528
Insurance | Property | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 366,639	366,781	370,445	375,981
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 10,732
Cumulative number of reported claims | claim	7,943
Insurance | Property | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 396,296	413,181	411,156
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 27,546
Cumulative number of reported claims | claim	7,707
Insurance | Property | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 392,842	395,636
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 95,149
Cumulative number of reported claims | claim	7,143
Insurance | Property | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 539,252
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 274,741
Cumulative number of reported claims | claim	6,578
Insurance | Accident and health
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 1,054,086
Insurance | Accident and health | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	60,933	60,850	63,519	62,860	63,527	63,844	63,278	65,066	68,570	70,003
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,075
Cumulative number of reported claims | claim	44,138
Insurance | Accident and health | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 85,654	86,249	86,822	87,038	86,029	86,343	85,219	84,824	84,654
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 860
Cumulative number of reported claims | claim	87,001
Insurance | Accident and health | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 117,082	116,916	115,798	115,913	115,848	117,761	119,968	113,374
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 74
Cumulative number of reported claims | claim	688,000
Insurance | Accident and health | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 114,193	113,253	112,563	111,552	113,478	114,418	110,256
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 130
Cumulative number of reported claims | claim	745,012
Insurance | Accident and health | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 69,578	67,110	68,028	64,562	74,067	73,130
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 556
Cumulative number of reported claims | claim	675,633
Insurance | Accident and health | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 64,902	62,922	66,164	62,944	69,137
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 555
Cumulative number of reported claims | claim	718,518
Insurance | Accident and health | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 75,036	76,918	70,639	68,873
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,664
Cumulative number of reported claims | claim	440,175
Insurance | Accident and health | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 95,259	98,228	97,576
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 2,660
Cumulative number of reported claims | claim	400,429
Insurance | Accident and health | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 163,983	170,186
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 19,627
Cumulative number of reported claims | claim	406,521
Insurance | Accident and health | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 207,466
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 74,872
Cumulative number of reported claims | claim	365,749
Insurance | Marine and aviation
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 2,174,512
Insurance | Marine and aviation | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	141,557	141,862	143,359	143,385	144,418	138,907	151,503	159,304	164,397	186,023
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1
Cumulative number of reported claims | claim	4,316
Insurance | Marine and aviation | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 100,809	101,680	100,732	99,830	100,703	101,322	109,092	111,630	115,442
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 2,930
Cumulative number of reported claims | claim	4,898
Insurance | Marine and aviation | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 211,499	212,002	213,545	213,940	222,060	224,246	227,207	260,225
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 5,926
Cumulative number of reported claims | claim	8,589
Insurance | Marine and aviation | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 225,769	225,057	223,605	230,422	237,372	251,517	234,768
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 11,695
Cumulative number of reported claims | claim	8,787
Insurance | Marine and aviation | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 246,540	221,512	223,032	210,690	208,026	213,917
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 4,556
Cumulative number of reported claims | claim	7,755
Insurance | Marine and aviation | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 167,229	163,264	161,953	178,537	207,122
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 9,134
Cumulative number of reported claims | claim	6,533
Insurance | Marine and aviation | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 222,356	201,232	219,002	238,454
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 20,126
Cumulative number of reported claims | claim	6,922
Insurance | Marine and aviation | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 255,744	254,138	263,742
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 68,596
Cumulative number of reported claims | claim	7,650
Insurance | Marine and aviation | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 261,711	297,529
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 99,643
Cumulative number of reported claims | claim	7,266
Insurance | Marine and aviation | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 341,298
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 185,817
Cumulative number of reported claims | claim	6,103
Insurance | Cyber
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 855,794
Insurance | Cyber | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	48,036	48,042	49,795	52,526	50,758	50,357	51,250	63,066	63,595	65,231
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 2,226
Cumulative number of reported claims | claim	1,428
Insurance | Cyber | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 25,254	25,258	27,873	29,929	37,322	40,266	58,261	56,565	58,741
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,079
Cumulative number of reported claims | claim	1,671
Insurance | Cyber | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 46,036	48,343	48,696	50,910	51,931	56,783	50,794	53,187
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ (4)
Cumulative number of reported claims | claim	1,817
Insurance | Cyber | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 29,447	23,902	26,168	30,558	33,962	31,966	33,429
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,845
Cumulative number of reported claims | claim	2,156
Insurance | Cyber | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 63,767	71,246	80,157	80,098	56,994	54,237
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 3,608
Cumulative number of reported claims | claim	2,904
Insurance | Cyber | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 133,525	124,751	101,604	104,869	113,305
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 24,605
Cumulative number of reported claims | claim	2,880
Insurance | Cyber | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 105,722	104,732	133,593	124,709
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 21,145
Cumulative number of reported claims | claim	2,450
Insurance | Cyber | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 119,484	119,436	128,483
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 61,903
Cumulative number of reported claims | claim	1,766
Insurance | Cyber | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 126,343	126,838
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 57,395
Cumulative number of reported claims | claim	2,336
Insurance | Cyber | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 158,180
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 138,542
Cumulative number of reported claims | claim	1,325
Insurance | Professional lines
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 3,954,264
Insurance | Professional lines | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	285,261	280,054	281,645	270,615	271,774	288,635	301,759	315,378	308,832	308,206
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 12,111
Cumulative number of reported claims | claim	9,662
Insurance | Professional lines | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 359,445	354,094	337,725	336,376	326,544	314,273	295,992	291,739	287,119
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 21,448
Cumulative number of reported claims | claim	10,949
Insurance | Professional lines | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 395,866	390,818	386,243	388,467	372,365	371,856	339,010	336,606
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 37,337
Cumulative number of reported claims | claim	12,966
Insurance | Professional lines | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 467,834	464,430	445,299	419,568	388,834	339,960	323,638
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 32,176
Cumulative number of reported claims | claim	15,537
Insurance | Professional lines | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 466,546	455,966	408,326	375,361	360,720	345,193
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 74,818
Cumulative number of reported claims | claim	14,793
Insurance | Professional lines | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 292,430	290,925	299,016	318,886	320,300
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 92,856
Cumulative number of reported claims | claim	9,634
Insurance | Professional lines | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 320,376	323,579	366,527	375,982
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 157,986
Cumulative number of reported claims | claim	8,656
Insurance | Professional lines | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 437,668	443,592	457,637
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 297,452
Cumulative number of reported claims | claim	8,740
Insurance | Professional lines | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 440,324	438,129
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 335,563
Cumulative number of reported claims | claim	10,252
Insurance | Professional lines | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 488,514
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 459,342
Cumulative number of reported claims | claim	7,556
Insurance | Credit and political risk
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 399,853
Insurance | Credit and political risk | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	23,309	23,309	23,309	24,189	24,851	25,930	26,012	27,524	30,368	30,329
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 0
Cumulative number of reported claims | claim	2
Insurance | Credit and political risk | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 25,703	25,705	25,705	26,785	27,766	43,980	43,409	45,899	43,327
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ (2)
Cumulative number of reported claims | claim	2
Insurance | Credit and political risk | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 7,744	8,404	10,904	15,867	18,118	25,783	32,467	47,743
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 3,167
Cumulative number of reported claims | claim	4
Insurance | Credit and political risk | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 24,379	23,774	20,464	24,093	32,057	33,166	42,339
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 5,084
Cumulative number of reported claims | claim	2
Insurance | Credit and political risk | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 69,499	70,922	73,703	75,270	80,386	52,570
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 10,431
Cumulative number of reported claims | claim	33
Insurance | Credit and political risk | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 47,927	49,018	60,212	69,650	60,857
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 18,124
Cumulative number of reported claims | claim	44
Insurance | Credit and political risk | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 26,769	26,140	36,817	42,063
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 12,908
Cumulative number of reported claims | claim	24
Insurance | Credit and political risk | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 43,030	44,078	45,035
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 34,088
Cumulative number of reported claims | claim	27
Insurance | Credit and political risk | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 59,525	58,702
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 40,167
Cumulative number of reported claims | claim	31
Insurance | Credit and political risk | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 71,968
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 67,838
Cumulative number of reported claims | claim	20
Insurance | Liability
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 2,760,885
Insurance | Liability | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	194,101	189,335	187,816	186,575	187,650	182,354	164,685	137,188	127,087	128,433
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 21,585
Cumulative number of reported claims | claim	6,886
Insurance | Liability | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 124,707	124,751	125,396	119,993	119,989	127,257	128,697	130,074	124,296
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 11,666
Cumulative number of reported claims | claim	7,755
Insurance | Liability | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 247,666	249,403	213,374	203,242	199,054	183,687	165,181	166,690
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 27,690
Cumulative number of reported claims | claim	8,903
Insurance | Liability | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 258,462	250,910	215,235	203,849	189,916	167,040	166,951
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 34,684
Cumulative number of reported claims | claim	8,731
Insurance | Liability | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 300,576	299,503	236,977	221,935	192,509	191,681
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 42,047
Cumulative number of reported claims | claim	8,398
Insurance | Liability | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 245,534	248,412	230,122	224,321	223,954
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 54,701
Cumulative number of reported claims | claim	6,408
Insurance | Liability | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 292,933	301,010	244,781	231,577
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 75,781
Cumulative number of reported claims | claim	7,246
Insurance | Liability | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 357,079	356,752	322,623
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 162,714
Cumulative number of reported claims | claim	8,258
Insurance | Liability | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 360,192	363,821
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 255,535
Cumulative number of reported claims | claim	7,085
Insurance | Liability | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 379,635
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 351,221
Cumulative number of reported claims | claim	3,727
Reinsurance | Accident and health
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	$ 2,003,038
Reinsurance | Accident and health | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	92,914	92,966	92,221	92,251	93,243	92,906	93,627	93,862	100,350	93,754
Total of incurred-but-not-reported liabilities plus expected development on reported claims	84
Reinsurance | Accident and health | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	190,971	190,319	190,190	190,290	189,280	189,806	188,189	191,077	170,604
Total of incurred-but-not-reported liabilities plus expected development on reported claims	655
Reinsurance | Accident and health | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	182,326	181,916	182,973	183,023	182,013	183,173	189,292	183,761
Total of incurred-but-not-reported liabilities plus expected development on reported claims	384
Reinsurance | Accident and health | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	197,152	196,940	199,949	200,611	197,880	200,151	193,622
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,119
Reinsurance | Accident and health | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	199,155	198,928	204,907	207,308	211,873	217,364
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,108
Reinsurance | Accident and health | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	198,843	199,261	213,245	220,449	226,693
Total of incurred-but-not-reported liabilities plus expected development on reported claims	504
Reinsurance | Accident and health | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	218,106	222,084	226,777	231,917
Total of incurred-but-not-reported liabilities plus expected development on reported claims	3,442
Reinsurance | Accident and health | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	256,577	262,981	267,051
Total of incurred-but-not-reported liabilities plus expected development on reported claims	19,738
Reinsurance | Accident and health | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	251,034	242,835
Total of incurred-but-not-reported liabilities plus expected development on reported claims	43,093
Reinsurance | Accident and health | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	215,960
Total of incurred-but-not-reported liabilities plus expected development on reported claims	77,080
Reinsurance | Agriculture
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	1,070,258
Reinsurance | Agriculture | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	96,287	96,225	95,608	95,476	95,492	95,314	95,308	95,321	95,576	103,144
Total of incurred-but-not-reported liabilities plus expected development on reported claims	(3)
Reinsurance | Agriculture | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	108,701	108,912	108,167	108,219	109,042	108,795	110,207	117,045	123,359
Total of incurred-but-not-reported liabilities plus expected development on reported claims	14
Reinsurance | Agriculture | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	133,371	136,483	137,342	138,810	139,344	138,274	144,159	151,526
Total of incurred-but-not-reported liabilities plus expected development on reported claims	36
Reinsurance | Agriculture | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	146,050	142,610	139,823	140,457	140,727	147,182	140,830
Total of incurred-but-not-reported liabilities plus expected development on reported claims	399
Reinsurance | Agriculture | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	184,383	182,923	183,213	187,599	185,089	182,793
Total of incurred-but-not-reported liabilities plus expected development on reported claims	323
Reinsurance | Agriculture | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	59,833	61,801	63,702	62,636	62,506
Total of incurred-but-not-reported liabilities plus expected development on reported claims	153
Reinsurance | Agriculture | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	56,784	57,608	61,057	69,694
Total of incurred-but-not-reported liabilities plus expected development on reported claims	3,740
Reinsurance | Agriculture | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	90,378	91,299	101,001
Total of incurred-but-not-reported liabilities plus expected development on reported claims	3,573
Reinsurance | Agriculture | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	104,308	103,003
Total of incurred-but-not-reported liabilities plus expected development on reported claims	45,157
Reinsurance | Agriculture | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	90,163
Total of incurred-but-not-reported liabilities plus expected development on reported claims	82,981
Reinsurance | Marine and aviation
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	436,150
Reinsurance | Marine and aviation | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	11,964	11,993	11,937	11,986	12,220	12,589	14,938	10,777	9,193	10,360
Total of incurred-but-not-reported liabilities plus expected development on reported claims	441
Reinsurance | Marine and aviation | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	35,920	35,208	35,715	35,309	34,982	36,486	35,092	34,714	32,111
Total of incurred-but-not-reported liabilities plus expected development on reported claims	131
Reinsurance | Marine and aviation | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	41,445	40,366	40,443	42,787	46,176	40,935	42,541	54,853
Total of incurred-but-not-reported liabilities plus expected development on reported claims	78
Reinsurance | Marine and aviation | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	47,392	48,103	46,729	43,264	26,877	27,331	18,797
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,198
Reinsurance | Marine and aviation | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	86,262	84,590	81,494	79,650	81,921	69,487
Total of incurred-but-not-reported liabilities plus expected development on reported claims	4,059
Reinsurance | Marine and aviation | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	37,990	36,464	37,298	41,273	40,006
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,803
Reinsurance | Marine and aviation | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	38,786	35,108	40,438	43,366
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,642
Reinsurance | Marine and aviation | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	49,649	58,762	68,401
Total of incurred-but-not-reported liabilities plus expected development on reported claims	17,062
Reinsurance | Marine and aviation | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	37,916	40,526
Total of incurred-but-not-reported liabilities plus expected development on reported claims	20,892
Reinsurance | Marine and aviation | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	48,826
Total of incurred-but-not-reported liabilities plus expected development on reported claims	41,877
Reinsurance | Professional lines
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	1,770,315
Reinsurance | Professional lines | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	250,292	250,896	239,843	233,925	227,420	230,444	223,865	213,232	211,024	211,361
Total of incurred-but-not-reported liabilities plus expected development on reported claims	15,211
Reinsurance | Professional lines | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	276,527	277,105	265,439	253,578	253,676	226,305	198,934	195,543	194,564
Total of incurred-but-not-reported liabilities plus expected development on reported claims	18,210
Reinsurance | Professional lines | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	237,500	237,237	208,425	185,849	176,245	160,679	154,560	154,215
Total of incurred-but-not-reported liabilities plus expected development on reported claims	27,326
Reinsurance | Professional lines | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	190,588	193,077	172,179	164,134	153,514	146,713	144,599
Total of incurred-but-not-reported liabilities plus expected development on reported claims	(677)
Reinsurance | Professional lines | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	149,984	154,826	143,617	138,634	135,003	135,866
Total of incurred-but-not-reported liabilities plus expected development on reported claims	15,699
Reinsurance | Professional lines | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	135,632	131,679	133,815	138,846	138,881
Total of incurred-but-not-reported liabilities plus expected development on reported claims	55,500
Reinsurance | Professional lines | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	135,793	134,870	139,462	147,464
Total of incurred-but-not-reported liabilities plus expected development on reported claims	77,868
Reinsurance | Professional lines | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	152,014	152,352	168,535
Total of incurred-but-not-reported liabilities plus expected development on reported claims	99,800
Reinsurance | Professional lines | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	135,427	135,093
Total of incurred-but-not-reported liabilities plus expected development on reported claims	106,522
Reinsurance | Professional lines | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	106,558
Total of incurred-but-not-reported liabilities plus expected development on reported claims	96,010
Reinsurance | Credit and surety
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	835,280
Reinsurance | Credit and surety | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	125,755	125,761	129,441	134,817	133,679	132,750	150,883	154,425	159,662	156,256
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,361
Reinsurance | Credit and surety | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	111,169	109,579	107,428	109,778	112,113	119,427	144,405	136,760	138,199
Total of incurred-but-not-reported liabilities plus expected development on reported claims	592
Reinsurance | Credit and surety | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	110,277	111,360	110,948	111,099	113,551	122,255	128,141	135,014
Total of incurred-but-not-reported liabilities plus expected development on reported claims	2,239
Reinsurance | Credit and surety | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	87,535	87,774	101,044	106,339	109,266	115,673	108,874
Total of incurred-but-not-reported liabilities plus expected development on reported claims	3,276
Reinsurance | Credit and surety | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	54,501	54,467	62,649	64,711	64,952	72,245
Total of incurred-but-not-reported liabilities plus expected development on reported claims	3,369
Reinsurance | Credit and surety | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	89,395	94,044	68,240	82,568	76,156
Total of incurred-but-not-reported liabilities plus expected development on reported claims	13,239
Reinsurance | Credit and surety | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	41,061	40,832	43,356	51,523
Total of incurred-but-not-reported liabilities plus expected development on reported claims	13,639
Reinsurance | Credit and surety | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	50,203	50,474	63,310
Total of incurred-but-not-reported liabilities plus expected development on reported claims	30,771
Reinsurance | Credit and surety | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	85,451	85,730
Total of incurred-but-not-reported liabilities plus expected development on reported claims	45,993
Reinsurance | Credit and surety | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	79,933
Total of incurred-but-not-reported liabilities plus expected development on reported claims	54,383
Reinsurance | Motor
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	2,209,966
Reinsurance | Motor | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	199,471	199,519	200,843	200,453	203,169	204,009	214,510	212,699	208,783	215,985
Total of incurred-but-not-reported liabilities plus expected development on reported claims	10,658
Reinsurance | Motor | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	238,942	238,717	238,113	234,357	236,810	244,592	254,013	252,847	239,098
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,903
Reinsurance | Motor | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	351,699	351,598	344,966	349,584	348,494	347,805	358,716	353,883
Total of incurred-but-not-reported liabilities plus expected development on reported claims	21,818
Reinsurance | Motor | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	350,894	351,737	339,260	351,594	354,625	343,752	348,090
Total of incurred-but-not-reported liabilities plus expected development on reported claims	17,085
Reinsurance | Motor | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	326,155	326,641	321,798	330,904	330,204	331,840
Total of incurred-but-not-reported liabilities plus expected development on reported claims	7,574
Reinsurance | Motor | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	192,990	192,333	208,823	212,344	209,930
Total of incurred-but-not-reported liabilities plus expected development on reported claims	7,877
Reinsurance | Motor | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	178,561	178,461	176,135	176,116
Total of incurred-but-not-reported liabilities plus expected development on reported claims	22,550
Reinsurance | Motor | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	158,097	166,810	154,073
Total of incurred-but-not-reported liabilities plus expected development on reported claims	24,177
Reinsurance | Motor | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	128,732	121,411
Total of incurred-but-not-reported liabilities plus expected development on reported claims	23,925
Reinsurance | Motor | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	84,425
Total of incurred-but-not-reported liabilities plus expected development on reported claims	50,610
Reinsurance | Liability
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	3,050,692
Reinsurance | Liability | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	215,609	215,869	205,170	202,266	212,453	212,052	214,193	214,303	213,356	213,111
Total of incurred-but-not-reported liabilities plus expected development on reported claims	12,588
Reinsurance | Liability | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	313,766	311,876	271,912	264,490	260,727	251,425	248,154	243,345	238,237
Total of incurred-but-not-reported liabilities plus expected development on reported claims	30,063
Reinsurance | Liability | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	338,776	339,798	303,916	294,535	285,245	276,627	267,788	273,121
Total of incurred-but-not-reported liabilities plus expected development on reported claims	25,655
Reinsurance | Liability | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	349,317	349,520	304,407	284,659	271,505	266,567	262,170
Total of incurred-but-not-reported liabilities plus expected development on reported claims	47,871
Reinsurance | Liability | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	334,773	329,313	271,351	272,501	270,541	262,105
Total of incurred-but-not-reported liabilities plus expected development on reported claims	82,959
Reinsurance | Liability | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	307,787	303,976	277,534	282,700	282,298
Total of incurred-but-not-reported liabilities plus expected development on reported claims	104,900
Reinsurance | Liability | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	334,588	343,399	310,334	302,849
Total of incurred-but-not-reported liabilities plus expected development on reported claims	139,743
Reinsurance | Liability | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	334,639	341,727	346,756
Total of incurred-but-not-reported liabilities plus expected development on reported claims	165,420
Reinsurance | Liability | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	273,571	273,950
Total of incurred-but-not-reported liabilities plus expected development on reported claims	170,489
Reinsurance | Liability | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	247,866
Total of incurred-but-not-reported liabilities plus expected development on reported claims	217,212
Reinsurance | Run-off lines
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	3,458,454
Reinsurance | Run-off lines | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	240,152	240,289	242,674	244,566	246,713	241,916	243,094	252,266	252,265	$ 264,343
Total of incurred-but-not-reported liabilities plus expected development on reported claims	1,636
Reinsurance | Run-off lines | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	265,991	266,307	273,184	273,472	273,294	269,952	275,202	277,871	$ 278,963
Total of incurred-but-not-reported liabilities plus expected development on reported claims	3,048
Reinsurance | Run-off lines | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	729,636	725,458	733,045	742,270	744,427	743,852	702,732	$ 701,995
Total of incurred-but-not-reported liabilities plus expected development on reported claims	23,633
Reinsurance | Run-off lines | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	587,086	589,927	589,801	603,972	617,932	603,305	$ 518,635
Total of incurred-but-not-reported liabilities plus expected development on reported claims	14,977
Reinsurance | Run-off lines | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	368,869	366,152	372,883	387,635	407,538	$ 431,902
Total of incurred-but-not-reported liabilities plus expected development on reported claims	14,143
Reinsurance | Run-off lines | Accident Year 2020
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	533,431	537,210	533,206	538,067	$ 509,942
Total of incurred-but-not-reported liabilities plus expected development on reported claims	31,778
Reinsurance | Run-off lines | Accident Year 2021
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	421,678	422,974	427,037	$ 419,674
Total of incurred-but-not-reported liabilities plus expected development on reported claims	28,832
Reinsurance | Run-off lines | Accident Year 2022
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	221,806	218,849	$ 260,346
Total of incurred-but-not-reported liabilities plus expected development on reported claims	43,059
Reinsurance | Run-off lines | Accident Year 2023
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	60,979	$ 63,904
Total of incurred-but-not-reported liabilities plus expected development on reported claims	21,860
Reinsurance | Run-off lines | Accident Year 2024
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses	28,826
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 7,873