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Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 694,898 | $ 3,411,256
12 months or greater | 3,664,661 | 1,592,040
Total | 4,359,559 | 5,003,296
Less than 12 months | (12,254) | (298,637)
12 months or greater | (353,890) | (224,403)
Total | $ (366,144) | $ (523,040)
Number of securities in unrealized loss position | security | 1,021 | 1,226
U.S. government securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 26,550 | $ 67,531
12 months or greater | 98,359 | 76,246
Total | 124,909 | 143,777
Less than 12 months | (75) | (3,583)
12 months or greater | (6,289) | (6,100)
Total | (6,364) | (9,683)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 275,727 | 1,344,272
12 months or greater | 1,200,533 | 360,956
Total | 1,476,260 | 1,705,228
Less than 12 months | (3,622) | (157,903)
12 months or greater | (186,213) | (98,170)
Total | (189,835) | (256,073)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 270,956 | 1,488,255
12 months or greater | 1,604,021 | 758,732
Total | 1,874,977 | 2,246,987
Less than 12 months | (6,060) | (109,976)
12 months or greater | (122,151) | (86,401)
Total | (128,211) | (196,377)
ABS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 41,549 | 53,201
12 months or greater | 62,611 | 67,073
Total | 104,160 | 120,274
Less than 12 months | (1,234) | (1,008)
12 months or greater | (2,041) | (5,033)
Total | (3,275) | (6,041)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 44,867 | 77,563
12 months or greater | 176,349 | 136,179
Total | 221,216 | 213,742
Less than 12 months | (872) | (8,572)
12 months or greater | (19,784) | (17,172)
Total | (20,656) | (25,744)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 35,249 | 166,973
12 months or greater | 244,216 | 70,792
Total | 279,465 | 237,765
Less than 12 months | (391) | (12,951)
12 months or greater | (15,361) | (7,640)
Total | (15,752) | (20,591)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 213,461
12 months or greater | 274,729 | 114,459
Total | 274,729 | 327,920
Less than 12 months | 0 | (4,644)
12 months or greater | (1,408) | (3,185)
Total | (1,408) | (7,829)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 0
12 months or greater | 3,843 | 3,787
Total | 3,843 | 3,787
Less than 12 months | 0 | 0
12 months or greater | (643) | (699)
Total | $ (643) | (699)
Commercial paper |  |
Schedule of Investments [Line Items] |  |
Less than 12 months |  | 0
12 months or greater |  | 3,816
Total |  | 3,816
Less than 12 months |  | 0
12 months or greater |  | (3)
Total |  | $ (3)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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