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Deferred Costs, Capitalized, Prepaid, and Other Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Deferred Policy Acquisition Cost, Beginning Balance $ 591.6 $ 635.6
Deferred Policy Acquisition Cost, Capitalization 280.6 322.3
Deferred Policy Acquisition Costs, Amortization Expense (261.0) (305.4)
Deferred Policy Acquisition Cost, Experience Adjustment (3.2) (6.3)
Deferred Policy Acquisition Cost, Ending Balance 608.0 646.2
Property and Casualty Insurance Reserves    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Deferred Policy Acquisition Cost, Beginning Balance 164.9 231.1
Deferred Policy Acquisition Cost, Capitalization 246.9 294.6
Deferred Policy Acquisition Costs, Amortization Expense (250.5) (295.7)
Deferred Policy Acquisition Cost, Experience Adjustment 0.0 0.0
Deferred Policy Acquisition Cost, Ending Balance 161.3 230.0
Life and Health Insurance [Member]    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Deferred Policy Acquisition Cost, Beginning Balance 426.7 404.5
Deferred Policy Acquisition Cost, Capitalization 33.7 27.7
Deferred Policy Acquisition Costs, Amortization Expense (10.5) (9.7)
Deferred Policy Acquisition Cost, Experience Adjustment (3.2) (6.3)
Deferred Policy Acquisition Cost, Ending Balance $ 446.7 $ 416.2