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Investments - Fixed Maturity Securities in Continuous Loss Position (Details) | Sep. 30, 2025 security | Sep. 30, 2025 position | Dec. 31, 2024 security | Dec. 31, 2024 position
--- | --- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months | 1,708 | 1,708 | 1,862 | 1,862
Investment Grade |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 1,625 |  | 1,744
Non Investment Grade |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 39 |  | 62
AAA |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 140 |  | 155
AA |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 882 |  | 899
A |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 286 |  | 320
BBB |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 317 |  | 370
BB |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 29 |  | 40
B |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 8 |  | 18
CCC or lower |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 2 |  | 4
Not rated |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Number of position with a gross unrealized loss, more than 12 months |  | 44 |  | 56

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