Policyholder Contract Liabilities - Policyholder Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Policyholder Obligations	$ 655.7	$ 701.3	[1]
Universal Life-type Policyholder Account Balances
Investment Holdings [Line Items]
Policyholder Obligations	98.3	100.3
United Insurance | FHLB of Chicago
Investment Holdings [Line Items]
Policyholder Obligations	$ 557.4	$ 601.0

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.