v3.26.3
Basis of Presentation and Significant Accounting Policies (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
segment
Sep. 30, 2025
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]          
Number of reportable segments (in segments) | segment       4  
Net income $ 58.5 $ 58.3   $ 141.3 $ 125.9
Net investment income 139.7 119.6   370.9 346.3
Life & Retirement          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]          
Net income 34.1 16.9   61.3 43.7
Supplemental & Group Benefits          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]          
Net income $ 16.6 $ 15.0   $ 35.0 $ 34.1
Revision of Prior Period, Error Correction, Adjustment          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]          
Net income     $ 8.1    
Net investment income     10.2    
Revision of Prior Period, Error Correction, Adjustment | Life & Retirement          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]          
Net income     5.3    
Revision of Prior Period, Error Correction, Adjustment | Supplemental & Group Benefits          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]          
Net income     $ 2.8