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Segment Information (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Segment
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]    
Reportable segments | Segment 4  
Identifiable assets $ 83.6 $ 85.7
Liabilities held-for-sale $ 108.6 108.6
Segment reporting, codm, profit (loss) measure, how used, description Results of the reporting segments are evaluated based on operating income (loss) before interest expense and income taxes, which excludes certain items that are included in net income, such as net realized and unrealized investment gains and losses. Such gains and losses are excluded since they are determined by interest rates, financial markets and the timing of sales. Also, operating income (loss) before interest expense and income taxes excludes net gains and losses on disposals of businesses, gains and losses related to the repayment of debt, discontinued operations, costs to acquire businesses, restructuring costs, the cumulative effect of accounting changes and certain other items. Although the items excluded from operating income (loss) before interest expense and income taxes may be important components in understanding and assessing the Company’s overall financial performance, management believes that the presentation of operating income (loss) before interest expense and income taxes enhances an investor’s understanding of the Company’s results of operations by highlighting net income attributable to the core operations of the business. However, operating income (loss) before interest expense and income taxes should not be construed as a substitute for income before income taxes or income from continuing operations or as a substitute for net income.  
Segment reporting, expense information used by codm, description For the Core Commercial, Specialty and Personal Lines segments, the Company’s CODM uses operating income (loss) before interest expense and income taxes, along with future growth expectations in these measures, and industry and economic information, in deciding the allocation of resources (including employees, financial or capital resources) primarily during the strategic and annual planning processes. The CODM considers a variety of factors, both external and internal, including monthly performance of operating income (loss) before interest expense and income taxes, this performance relative to the plan, as well as current industry factors, and may update resource allocations accordingly throughout the year.  
Segment Reporting, Expense Information Used by CODM, Type [Extensible Enumeration] Operating Income (Loss) before Interest Expense and Income Taxes [Member]  
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] President and Chief Executive Officer [Member]  
Accident and Health Insurance Business [Member]    
Segment Reporting Information [Line Items]    
Identifiable assets $ 81.5 83.7
Liabilities held-for-sale $ 78.8 $ 78.9