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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
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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

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