v3.26.1
Basis of Presentation and Significant Accounting Policies (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Jun. 30, 2025
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Number of reportable segments (in segments) | segment     4  
Net income $ 41.6 $ 29.4 $ 82.8 $ 67.6
Net investment income 120.5 110.8 231.2 226.7
Life & Retirement        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Net income 20.1 20.0 27.2 26.8
Supplemental & Group Benefits        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Net income $ 8.5 7.9 $ 18.4 $ 19.1
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