Investments - Fixed Maturity Securities in Continuous Loss Position (Details)	Mar. 31, 2024 security	Mar. 31, 2024 position	Dec. 31, 2023 security	Dec. 31, 2023 position
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months	2,213	2,213	2,305	2,305
Investment Grade
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		2,027		2,103
Non Investment Grade
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		124		139
AAA
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		191		226
AA
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		984		1,006
A
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		415		423
BBB
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		437		448
BB
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		82		93
B
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		34		39
CCC or lower
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		8		7
Not rated
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		62		63