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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | $ 2,954,082 | $ 5,327,830 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (109,107) | (389,277) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 22,360,901 | 22,724,213 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (4,021,249) | (3,601,562) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 25,314,983 | 28,052,043 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (4,130,356) | (3,990,839) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 3,518 | 4,030 | $ 2,047 | $ 3,347
U.S. Government and agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 3,990 | 55,087 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (20) | (279) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 22,732 | 47,639 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (1,210) | (1,869) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 26,722 | 102,726 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,230) | (2,148) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
States, municipalities and territories |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 114,901 | 451,091 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (10,035) | (44,832) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,522,955 | 2,290,704 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (574,959) | (528,276) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 2,637,856 | 2,741,795 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (584,994) | (573,108) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Foreign corporate securities and foreign governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 17,385 | 1,555 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (92) | (195) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 382,787 | 427,021 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (80,842) | (71,625) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 400,172 | 428,576 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (80,934) | (71,820) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Corporate securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,280,454 | 3,275,031 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (34,771) | (237,744) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 14,276,990 | 13,625,542 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (2,774,173) | (2,367,304) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 15,557,444 | 16,900,573 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,808,944) | (2,605,048) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 3,293 | 3,412 | 1,914 | 3,214
Residential mortgage backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 51,291 | 145,093 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (836) | (7,614) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 653,903 | 858,821 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (106,897) | (105,122) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 705,194 | 1,003,914 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (107,733) | (112,736) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | 133 | 133
Commercial mortgage backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 55,259 | 431,947 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (1,517) | (69,007) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,497,882 | 2,416,868 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (388,854) | (385,088) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 2,553,141 | 2,848,815 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (390,371) | (454,095) |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 |  |
Other asset backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,430,802 | 968,026 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (61,836) | (29,606) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,003,652 | 3,057,618 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (94,314) | (142,278) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 3,434,454 | 4,025,644 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (156,150) | (171,884) |  |
Fixed maturity securities, available for sale, allowance for credit losses | $ 225 | $ 618 | $ 0 | $ 0

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