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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets |  |
Other comprehensive income - net unrealized losses on securities | $ 82.1 | $ 105.8
Unearned premium reserve reduction | 13.3 | 10.1
Compensation accruals | 9.3 | 8.4
Impaired securities | 2.0 | 2.0
Other comprehensive income - net funded status of benefit plans | 2.0 | 2.3
Discounting of unpaid claims and claim expense tax reserves | 2.7 | 2.8
Capital loss carryforward | 0.8 | 0.0
Net operating loss carryforward | 9.3 | 3.6
Intangibles | 1.4 | 0.0
Postretirement benefits other than pensions | 0.2 | 0.2
Total gross deferred tax assets | 123.1 | 135.2
Deferred tax liabilities |  |
Deferred policy acquisition costs | 45.9 | 48.5
Life insurance future policy benefit reserve | 46.4 | 42.4
Life insurance future policy benefit reserve (transitional rule) | 4.3 | 6.4
Discounting of unpaid claims and claim expense tax reserves (transitional rule) | 0.3 | 0.5
Investment related adjustments | 44.8 | 29.9
Other comprehensive income - net reserve remeasurements | 5.8 | 15.7
Other, net | 9.0 | 0.6
Total gross deferred tax liabilities | 156.5 | 144.0
Net deferred tax liability | $ 33.4 | $ 8.8

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