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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, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Income Tax Assets: |  |
Insurance Reserves | $ 18.4 | $ 16.2
Unearned Premium Reserves | 66.7 | 64.5
Tax Capitalization of Policy Acquisition Costs | 46.6 | 44.6
Payroll and Employee Benefit Accruals | 35.6 | 35.0
Net Operating Loss Carryforwards | 1.1 | 3.3
Other | 13.4 | 12.5
Total Deferred Income Tax Assets | 181.8 | 176.1
Deferred Income Tax Liabilities: |  |
Investments | 258.8 | 155.6
Deferred Policy Acquisition Costs | 123.7 | 112.9
Life VIF and P&C Customer Relationships | 5.0 | 5.3
Goodwill and Other Intangible Assets Acquired | 35.5 | 39.3
Depreciable Assets | 42.1 | 37.6
Other | 2.4 | 3.6
Total Deferred Income Tax Liabilities | 467.5 | 354.3
Net Deferred Income Tax Liabilities | $ 285.7 | $ 178.2

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