Investments - Fixed Maturity Securities in Continuous Loss Position (Details)	Mar. 31, 2026 security	Mar. 31, 2026 position	Dec. 31, 2025 security	Dec. 31, 2025 position
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months	1,606	1,606	1,649	1,649
Investment Grade
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		1,556		1,592
Non Investment Grade
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		30		34
AAA
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		139		140
AA
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		837		860
A
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		276		275
BBB
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		304		317
BB
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		22		24
B
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		7		8
CCC or lower
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		1		2
Not rated
Debt Securities, Available-for-Sale [Line Items]
Number of position with a gross unrealized loss, more than 12 months		20		23