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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The provision for combined current and deferred income taxes (credits) reflected in the consolidated statements of income does not bear the usual relationship to income before income taxes (credits) as the result of permanent and other differences between pretax income or loss and taxable income or loss determined under existing tax regulations. The more significant differences, their effect on the statutory income tax rate (credit), and the resulting effective income tax rates (credits) are summarized below:
Years Ended December 31:202120202019
Statutory tax rate (credit)21.0 %21.0 %21.0 %
Tax rate increases (decreases):
Tax-exempt interest(.2)(.5)(.2)
Dividends received exclusion(.7)(1.8)(.9)
Meals & entertainment.1 .1 .2 
Prior year adjustments— — — 
Other items - net— .1 — 
Effective tax rate (credit)20.2 %18.9 %20.1 %
Schedule of Deferred Tax Assets and Liabilities
The tax effects of temporary differences that give rise to significant portions of the Company's net deferred tax assets (liabilities) are as follows at the dates shown:
December 31:202120202019
Deferred Tax Assets:
    Losses, claims, and settlement expenses$214.2 $201.6 $195.2 
    Pension and deferred compensation plans42.4 63.0 48.3 
    Net operating loss carryforward9.6 11.7 13.8 
    AMT credit carryforward9.0 9.0 9.0 
    Operating leases49.7 52.0 49.9 
    Other temporary differences12.3 15.7 15.0 
        Total deferred tax assets337.5 353.2 331.4 
Deferred Tax Liabilities:
    Unearned premium reserves61.0 41.6 34.5 
    Deferred policy acquisition costs68.5 65.0 63.7 
    Amortization of fixed maturity securities5.2 4.4 3.4 
    Net unrealized investment gains372.6 295.9 257.8 
    Title plants and records2.8 2.8 2.9 
Tax reform transition adjustment on unpaid losses, claims and
settlement expenses13.8 17.2 19.5 
    Operating leases45.8 48.4 46.8 
    Other temporary differences17.2 14.9 14.7 
        Total deferred tax liabilities586.9 490.6 443.5 
        Net deferred tax assets (liabilities)$(249.5)$(137.3)$(112.2)