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Deferred Costs, Capitalized, Prepaid, and Other Assets (Details) - USD ($) $ in Millions | 6 Months Ended
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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

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