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Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 3,411,256 | $ 1,970,111
12 months or greater | 1,592,040 | 85,830
Total | 5,003,296 | 2,055,941
Less than 12 months | (298,637) | (26,842)
12 months or greater | (224,403) | (1,625)
Total | $ (523,040) | $ (28,467)
Number of securities in unrealized loss position | security | 1,226 | 610
U.S. government securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 67,531 | $ 91,154
12 months or greater | 76,246 | 2,616
Total | 143,777 | 93,770
Less than 12 months | (3,583) | (790)
12 months or greater | (6,100) | (78)
Total | (9,683) | (868)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 1,344,272 | 452,021
12 months or greater | 360,956 | 15,540
Total | 1,705,228 | 467,561
Less than 12 months | (157,903) | (7,189)
12 months or greater | (98,170) | (207)
Total | (256,073) | (7,396)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 1,488,255 | 865,085
12 months or greater | 758,732 | 10,997
Total | 2,246,987 | 876,082
Less than 12 months | (109,976) | (13,260)
12 months or greater | (86,401) | (516)
Total | (196,377) | (13,776)
ABS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 53,201 | 100,064
12 months or greater | 67,073 | 1,552
Total | 120,274 | 101,616
Less than 12 months | (1,008) | (998)
12 months or greater | (5,033) | (10)
Total | (6,041) | (1,008)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 77,563 | 180,586
12 months or greater | 136,179 | 31,641
Total | 213,742 | 212,227
Less than 12 months | (8,572) | (2,548)
12 months or greater | (17,172) | (730)
Total | (25,744) | (3,278)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 166,973 | 89,889
12 months or greater | 70,792 | 1,511
Total | 237,765 | 91,400
Less than 12 months | (12,951) | (1,887)
12 months or greater | (7,640) | (49)
Total | (20,591) | (1,936)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 213,461 | 177,663
12 months or greater | 114,459 | 21,973
Total | 327,920 | 199,636
Less than 12 months | (4,644) | (71)
12 months or greater | (3,185) | (35)
Total | (7,829) | (106)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 13,649
12 months or greater | 3,787 | 0
Total | 3,787 | 13,649
Less than 12 months | 0 | (99)
12 months or greater | (699) | 0
Total | (699) | $ (99)
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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