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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Unearned premium reserve reduction | $ 11.7 | $ 11.5
Compensation accruals | 9.6 | 9.5
Impaired securities | 2.3 | 2.1
Other comprehensive income - net funded status of benefit plans | 2.7 | 3.0
Discounting of unpaid claims and claim expense tax reserves | 2.5 | 2.5
Intangibles | 0.1 | 0.0
Postretirement benefits other than pensions | 0.3 | 0.3
Total gross deferred tax assets | 29.2 | 28.9
Deferred tax liabilities |  |
Other comprehensive income - net unrealized gains on securities | 101.1 | 124.7
Deferred policy acquisition costs | 37.3 | 36.3
Life insurance future policy benefit reserve | 30.7 | 26.7
Life insurance future policy benefit reserve (transitional rule) | 8.5 | 10.7
Discounting of unpaid claims and claim expense tax reserves (transitional rule) | 0.6 | 0.8
Investment related adjustments | 37.3 | 34.2
Intangibles | 0.0 | 0.2
Other, net | 4.2 | 2.0
Total gross deferred tax liabilities | 219.7 | 235.6
Net deferred tax liability | $ 190.5 | $ 206.7

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