Reserve for Future Policy Benefits and Contractholder Funds - Schedule of key assumptions used in calculating the reserve for future policy benefits (Details)	Jun. 30, 2023	Jun. 30, 2022
Accident and health insurance
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average duration (in years)	3 years 10 months 24 days	4 years
Interest accretion rate (discount rate at contract issuance)	5.08%	5.46%
Current discount rate (upper-medium grade fixed income yield)	4.79%	3.66%
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average duration (in years)	14 years	13 years
Interest accretion rate (discount rate at contract issuance)	5.46%	5.67%
Current discount rate (upper-medium grade fixed income yield)	5.14%	4.55%