v3.26.1
Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Intangible Asset, Finite-Lived [Line Items]        
Intangible Asset, Finite-Lived, Amortization Expense $ 10.1 $ 11.9 $ 20.4 $ 23.2
Operating Segments        
Intangible Asset, Finite-Lived [Line Items]        
Intangible Asset, Finite-Lived, Amortization Expense 6.7 6.3 13.1 12.1
Operating Segments | Specialty Property & Casualty Insurance        
Intangible Asset, Finite-Lived [Line Items]        
Intangible Asset, Finite-Lived, Amortization Expense 4.9 4.6 9.6 8.8
Operating Segments | Life Insurance        
Intangible Asset, Finite-Lived [Line Items]        
Intangible Asset, Finite-Lived, Amortization Expense 1.8 1.7 3.5 3.3
Corporate and Other        
Intangible Asset, Finite-Lived [Line Items]        
Intangible Asset, Finite-Lived, Amortization Expense 3.4 4.9 6.7 9.8
Non-Core Operations        
Intangible Asset, Finite-Lived [Line Items]        
Intangible Asset, Finite-Lived, Amortization Expense $ 0.0 $ 0.7 $ 0.6 $ 1.3