Investments - AFS Securities With Continuous Unrealized Loss Position (Details) - Insurance Solutions - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Fair value
Less than 12 months	$ 155,682	$ 61,285
12 months or more	97,996	113,956
Total	253,678	175,241
Unrealized losses
Less than 12 months	(3,917)	(650)
12 months or more	(20,573)	(19,343)
Total	(24,490)	(19,993)
U.S. government and agency
Fair value
Less than 12 months	2,769	778
12 months or more	5,163	5,172
Total	7,932	5,950
Unrealized losses
Less than 12 months	(60)	(40)
12 months or more	(322)	(310)
Total	(382)	(350)
U.S. state, territories and municipalities
Fair value
Less than 12 months	0	0
12 months or more	3,336	3,440
Total	3,336	3,440
Unrealized losses
Less than 12 months	0	0
12 months or more	(750)	(714)
Total	(750)	(714)
Corporate
Fair value
Less than 12 months	64,688	36,752
12 months or more	45,083	48,113
Total	109,771	84,865
Unrealized losses
Less than 12 months	(2,347)	(370)
12 months or more	(12,583)	(12,362)
Total	(14,930)	(12,732)
Asset and mortgage-backed securities
Fair value
Less than 12 months	88,225	23,755
12 months or more	41,424	53,666
Total	129,649	77,421
Unrealized losses
Less than 12 months	(1,510)	(240)
12 months or more	(4,519)	(4,133)
Total	(6,029)	(4,373)
Other invested assets
Fair value
Less than 12 months	0	0
12 months or more	2,990	3,565
Total	2,990	3,565
Unrealized losses
Less than 12 months	0	0
12 months or more	(2,399)	(1,824)
Total	$ (2,399)	$ (1,824)