v3.25.4
Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Policy Acquisition Cost, Beginning Balance $ 630.0 $ 591.6 $ 635.6
Capitalization 600.7 576.4 563.3
Amortization Expense (574.0) (538.0) (607.3)
Deferred Policy Acquisition Cost, Ending Balance 656.7 630.0 591.6
Experience adjustment 4.6 7.4 15.6
Variable Interest Entity, Primary Beneficiary      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Policy Acquisition Cost, Beginning Balance 1.1    
Deferred Policy Acquisition Cost, Ending Balance 1.3 1.1  
Operating Segments      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Policy Acquisition Cost, Beginning Balance 625.9 569.6 597.5
Capitalization 594.4 563.0 508.4
Amortization Expense (564.4) (506.7) (536.3)
Deferred Policy Acquisition Cost, Ending Balance 655.9 625.9 569.6
Operating Segments | Specialty      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Policy Acquisition Cost, Beginning Balance 162.8 142.6 192.7
Capitalization 530.9 494.3 446.3
Amortization Expense (534.9) (474.1) (496.4)
Deferred Policy Acquisition Cost, Ending Balance 158.8 162.8 142.6
Operating Segments | Life      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Policy Acquisition Cost, Beginning Balance 463.1 427.0 404.8
Capitalization 63.5 68.7 62.1
Amortization Expense (29.5) (32.6) (39.9)
Deferred Policy Acquisition Cost, Ending Balance 497.1 463.1 427.0
Non-Core Operations      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Policy Acquisition Cost, Beginning Balance 4.1 22.0 38.1
Capitalization 6.3 13.4 54.9
Amortization Expense (9.6) (31.3) (71.0)
Deferred Policy Acquisition Cost, Ending Balance 0.8 $ 4.1 $ 22.0
Impairment $ 2.0