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Policyholder Contract Liabilities - Supplemental Financial Information (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Liability under Funding Agreements $ 655.7 $ 701.3 [1]
United Insurance | FHLB of Chicago    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Liability under Funding Agreements 557.4 601.0
Fair Value of Collateral Pledged 629.3 744.6
FHLB Funding Agreements | United Insurance | FHLB of Chicago    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
FHLB of Chicago Common Stock Owned at Cost 16.6 17.5
Universal Life-type Policyholder Account Balances    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Liability under Funding Agreements $ 98.3 $ 100.3
[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.