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Income Taxes Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Federal deferred tax assets: |  |
Unearned premiums reserve | $ 368.9 | $ 515.6
Non-deductible accruals | 166.0 | 259.9
Loss and loss adjustment expense reserves | 48.4 | 76.5
Hedges on forecasted transactions | 4.8 | 5.1
Investment basis differences | 0.0 | 31.3
Other | 7.3 | 8.9
Federal deferred tax liabilities: |  |
Net unrealized gains on securities | (419.5) | (507.2)
Deferred acquisition costs | (163.9) | (227.9)
Property and equipment | (75.5) | (120.2)
Intangible assets | (66.6) | (145.3)
Prepaid expenses | (7.1) | (9.2)
Investment basis differences | (5.5) | 0.0
Deferred gain on extinguishment of debt | (0.4) | (1.5)
Other | (6.1) | (7.7)
Net federal deferred tax liability | (149.2) | (121.7)
Net state deferred tax asset | 14.2 | 10.4
Net deferred tax liability | $ (135.0) | $ (111.3)

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