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Goodwill and Intangible Assets - Schedule of Amortization Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]      
Amortization of definite lived intangible assets $ 46.3 $ 48.6 $ 53.7
Operating Segments      
Finite-Lived Intangible Assets [Line Items]      
Amortization of definite lived intangible assets 22.6 21.3 25.4
Operating Segments | Specialty Property & Casualty Insurance      
Finite-Lived Intangible Assets [Line Items]      
Amortization of definite lived intangible assets 16.6 17.9 21.6
Operating Segments | Life Insurance      
Finite-Lived Intangible Assets [Line Items]      
Amortization of definite lived intangible assets 6.0 3.4 3.8
Corporate and Other      
Finite-Lived Intangible Assets [Line Items]      
Amortization of definite lived intangible assets 21.8 26.1 26.7
Non-Core Operations      
Finite-Lived Intangible Assets [Line Items]      
Amortization of definite lived intangible assets $ 1.9 $ 1.2 $ 1.6