Dispositions - Assets and Liabilities Included in Disposition (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Reserve National Insurance Company $ in Millions	Dec. 01, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fixed Maturities at Fair Value (Amortized Cost: $43.3)	$ 36.7
Fixed maturities, amortized cost	43.3
Short-term Investments at Cost which Approximates Fair Value	0.7
Loans to Policyholders	0.7
Total Investments	38.1
Cash	81.0
Receivables from Policyholders	2.6
Other Receivables	1.6
Deferred Policy Acquisition Costs	38.7
Goodwill	0.3
Other Assets	3.1
Investment in Subsidiaries	0.2
Total Assets	165.6
Health Insurance Reserves	48.2
Unearned Premiums	10.8
Deferred Income Tax Liabilities	1.8
Accrued Expenses and Other Liabilities	13.8
Total Liabilities	$ 74.6