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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Beginning balance $ 630.0 $ 591.7
Capitalizations 464.3 429.4
Amortization Expense (434.0) (399.1)
Ending balance 660.3 622.0
Variable Interest Entity, Primary Beneficiary    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Beginning balance 1.1 0.1
Ending balance 1.4 0.7
Operating Segments    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Beginning balance 625.9 569.7
Capitalizations 459.4 418.0
Amortization Expense (426.1) (370.7)
Ending balance 659.2 617.0
Operating Segments | Specialty Property & Casualty Insurance    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Beginning balance 162.8 142.7
Capitalizations 411.0 365.4
Amortization Expense (404.4) (346.7)
Ending balance 169.4 161.4
Operating Segments | Life Insurance    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Beginning balance 463.1 427.0
Capitalizations 48.4 52.6
Amortization Expense (21.7) (24.0)
Ending balance 489.8 455.6
Corporate and Other    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Beginning balance 4.1 22.0
Capitalizations 4.9 11.4
Amortization Expense (7.9) (28.4)
Ending balance 1.1 $ 5.0
Deferred Policy Acquisition Costs, Impairment Loss $ 2.0