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Reserve for Claims and Claim Expenses - Schedule of Incurred and Paid Claims Development (Details) - USD ($) $ in Thousands	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	Dec. 31, 2014
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	$ 33,925,137
IBNR and ACR	11,098,566
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	19,053,753
Outstanding liabilities from accident year 2013 and prior, net of reinsurance	403,209
Adjustment for unallocated loss adjustment expenses	90,185
Unamortized fair value adjustments recorded in connection with acquisitions	(222,195)
Liability for claims and claim expenses, net of reinsurance	15,142,583
Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	13,527,160
IBNR and ACR	3,341,206
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	8,469,660
Outstanding liabilities from accident year 2013 and prior, net of reinsurance	77,214
Adjustment for unallocated loss adjustment expenses	13,949
Unamortized fair value adjustments recorded in connection with acquisitions	(51,689)
Liability for claims and claim expenses, net of reinsurance	5,096,974
Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	20,397,977
IBNR and ACR	7,757,360
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	10,584,093
Outstanding liabilities from accident year 2013 and prior, net of reinsurance	325,995
Adjustment for unallocated loss adjustment expenses	76,236
Unamortized fair value adjustments recorded in connection with acquisitions	(170,506)
Liability for claims and claim expenses, net of reinsurance	10,045,609
Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,168,571	$ 1,180,232	$ 1,189,016	$ 1,199,667	$ 1,229,153	$ 1,216,176	$ 1,231,639	$ 1,261,814	$ 1,292,051	$ 1,349,682
IBNR and ACR	37,966
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,090,421	1,085,206	1,067,201	1,037,804	1,008,653	953,310	886,043	800,559	651,426	351,514
Accident Year 2014 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	315,158	317,076	319,529	325,325	331,347	331,610	326,513	331,455	352,583	380,622
IBNR and ACR	1,284
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	313,571	311,424	311,708	308,420	308,616	301,017	292,484	276,964	229,525	125,296
Accident Year 2014 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	853,413	863,156	869,487	874,342	897,806	884,566	905,126	930,359	939,468	969,060
IBNR and ACR	36,682
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	776,850	773,782	755,493	729,384	700,037	652,293	593,559	523,595	421,901	$ 226,218
Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,495,256	1,497,021	1,504,626	1,502,100	1,512,704	1,534,787	1,580,294	1,612,942	1,682,812
IBNR and ACR	33,929
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,425,849	1,399,216	1,361,819	1,311,496	1,246,427	1,144,296	1,015,747	792,149	458,736
Accident Year 2015 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	376,792	377,861	375,769	384,744	389,650	399,498	416,585	459,762	511,360
IBNR and ACR	3,095
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	373,247	369,281	366,340	363,600	359,414	348,033	324,960	279,692	142,694
Accident Year 2015 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,118,464	1,119,160	1,128,857	1,117,356	1,123,054	1,135,289	1,163,709	1,153,180	1,171,452
IBNR and ACR	30,834
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,052,602	1,029,935	995,479	947,896	887,013	796,263	690,787	512,457	$ 316,042
Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,782,676	1,804,992	1,770,150	1,755,166	1,837,107	1,870,041	1,907,527	1,897,875
IBNR and ACR	18,118
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,633,339	1,603,460	1,537,961	1,432,356	1,296,066	1,118,420	907,567	473,090
Accident Year 2016 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	530,843	541,396	522,330	526,318	554,287	576,902	607,340	588,366
IBNR and ACR	3,114
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	487,678	491,344	486,482	475,616	449,190	415,348	332,918	146,671
Accident Year 2016 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,251,833	1,263,596	1,247,820	1,228,848	1,282,820	1,293,139	1,300,187	1,309,509
IBNR and ACR	15,004
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,145,661	1,112,116	1,051,479	956,740	846,876	703,072	574,649	$ 326,419
Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	3,180,295	3,190,159	3,255,713	3,285,056	3,357,851	3,443,204	3,697,137
IBNR and ACR	201,303
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	2,745,342	2,600,250	2,436,312	2,248,481	1,878,698	1,513,515	973,719
Accident Year 2017 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,532,082	1,559,925	1,624,156	1,681,670	1,698,844	1,824,613	2,018,855
IBNR and ACR	127,946
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,323,458	1,300,750	1,252,995	1,232,669	1,123,051	939,895	663,451
Accident Year 2017 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,648,213	1,630,234	1,631,557	1,603,386	1,659,007	1,618,591	1,678,282
IBNR and ACR	73,357
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,421,884	1,299,500	1,183,317	1,015,812	755,647	573,620	$ 310,268
Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	3,112,753	3,081,439	3,075,000	3,205,113	3,266,784	3,030,203
IBNR and ACR	406,074
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	2,374,401	2,252,816	2,029,342	1,719,662	1,300,839	676,031
Accident Year 2018 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,216,792	1,267,732	1,280,066	1,408,253	1,465,633	1,374,423
IBNR and ACR	171,088
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	971,282	1,032,771	990,041	954,175	776,630	454,838
Accident Year 2018 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,895,961	1,813,707	1,794,934	1,796,860	1,801,151	1,655,780
IBNR and ACR	234,986
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,403,119	1,220,045	1,039,301	765,487	524,209	$ 221,193
Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,613,203	2,600,638	2,669,111	2,754,429	2,765,868
IBNR and ACR	355,502
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	2,042,749	1,723,144	1,390,797	1,019,032	386,711
Accident Year 2019 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	953,986	1,017,085	1,103,449	1,191,214	1,203,828
IBNR and ACR	123,856
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	813,107	748,804	660,693	475,613	165,811
Accident Year 2019 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,659,217	1,583,553	1,565,662	1,563,215	1,562,040
IBNR and ACR	231,646
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,229,642	974,340	730,104	543,419	$ 220,900
Accident Year 2020
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	4,408,976	4,423,413	4,429,197	4,435,130
IBNR and ACR	1,079,825
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	2,788,153	2,296,810	1,773,193	761,877
Accident Year 2020 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,036,200	2,092,021	2,098,289	1,989,861
IBNR and ACR	428,120
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,317,414	1,109,201	836,501	283,840
Accident Year 2020 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,372,776	2,331,392	2,330,908	2,445,269
IBNR and ACR	651,705
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,470,739	1,187,609	936,692	$ 478,037
Accident Year 2021
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	5,178,965	5,378,071	5,552,945
IBNR and ACR	1,413,339
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	2,966,887	2,116,223	892,239
Accident Year 2021 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,628,136	2,713,942	2,744,649
IBNR and ACR	301,855
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,862,525	1,366,213	580,026
Accident Year 2021 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,550,829	2,664,129	2,808,296
IBNR and ACR	1,111,484
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,104,362	750,010	$ 312,213
Accident Year 2022
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	5,680,547	5,966,078
IBNR and ACR	3,271,322
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,463,927	285,530
Accident Year 2022 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,463,435	2,584,543
IBNR and ACR	1,134,057
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	772,239	79,480
Accident Year 2022 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	3,217,112	3,381,535
IBNR and ACR	2,137,265
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	691,688	$ 206,050
Accident Year 2023
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	5,303,895
IBNR and ACR	4,281,188
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	522,685
Accident Year 2023 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,473,736
IBNR and ACR	1,046,791
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	235,139
Accident Year 2023 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	3,830,159
IBNR and ACR	3,234,397
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	$ 287,546

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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