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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Income Tax Disclosure [Abstract] |  |
Loss, LAE and unearned premium reserves, net | $ 226.1 | $ 211.0
Employee benefit plans | 11.1 | 9.4
Investments, net | 1.3 | 79.8
Other | 11.6 | 14.9
Total deferred tax assets | 250.1 | 315.1
Deferred acquisition costs | 147.6 | 139.2
Software capitalization | 19.2 | 1.7
Total deferred tax liabilities | 166.8 | 140.9
Net deferred tax asset | $ 83.3 | $ 174.2

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