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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets |  |
Other comprehensive income - net unrealized losses on securities | $ 85.2 | $ 82.1
Unearned premium reserve reduction | 14.4 | 13.3
Compensation accruals | 9.3 | 9.3
Impaired securities | 2.3 | 2.0
Other comprehensive income - net funded status of benefit plans | 1.9 | 2.0
Discounting of unpaid claims and claim expense tax reserves | 2.9 | 2.7
Capital loss carryforward | 1.2 | 0.8
Net operating loss carryforward | 0.6 | 9.3
Intangibles | 0.0 | 1.4
Postretirement benefits other than pensions | 0.2 | 0.2
Total gross deferred tax assets | 118.0 | 123.1
Deferred tax liabilities |  |
Deferred policy acquisition costs | 47.8 | 45.9
Life insurance future policy benefit reserve | 52.7 | 46.4
Life insurance future policy benefit reserve (transitional rule) | 2.1 | 4.3
Discounting of unpaid claims and claim expense tax reserves (transitional rule) | 0.2 | 0.3
Investment related adjustments | 39.3 | 44.8
Other comprehensive income - net reserve remeasurements | 23.8 | 5.8
Other, net | 7.9 | 9.0
Total gross deferred tax liabilities | 173.8 | 156.5
Net deferred tax liability | $ 55.8 | $ 33.4

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