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Investments - Fixed Maturity Securities in Continuous Loss Position (Details) | Dec. 31, 2023 security | Dec. 31, 2023 position | Dec. 31, 2022 security | Dec. 31, 2022 position
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months | 2,305 | 2,305 | 587 | 587
Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 2,103 |  | 471
Non Investment Grade |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 139 |  | 101
AAA |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 226 |  | 67
AA |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 1,006 |  | 217
A |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 423 |  | 94
BBB |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 448 |  | 93
BB |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 93 |  | 68
B |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 39 |  | 31
CCC or lower |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 7 |  | 2
Not rated |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 63 |  | 15

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