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Income Taxes - Schedule of Temporary Differences That Give Rise to Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax Assets:    
Insurance Reserves $ 31.9 $ 18.4
Unearned Premium Reserves 78.3 66.7
Tax Capitalization of Policy Acquisition Costs 46.6 46.6
Payroll and Employee Benefit Accruals 36.4 35.6
Net Operating Loss Carryforwards 3.6 1.1
Other 11.6 13.4
Total Deferred Income Tax Assets 208.4 181.8
Deferred Income Tax Liabilities:    
Investments 209.1 258.8
Deferred Policy Acquisition Costs 142.4 123.7
Life VIF and P&C Customer Relationships 4.6 5.0
Goodwill and Other Intangible Assets Acquired 38.0 35.5
Depreciable Assets 38.7 42.1
Other 2.6 2.4
Total Deferred Income Tax Liabilities 435.4 467.5
Net Deferred Income Tax Liabilities $ 227.0 $ 285.7