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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2021 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | $ 7,005.0
Amount Shown in Balance Sheet | 7,449.5
Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 5,797.7
Fair Value | 6,239.3
Amount Shown in Balance Sheet | 6,239.3
Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 147.2
Fair Value | 147.2
Amount Shown in Balance Sheet | 147.2
U.S. Government and federally sponsored agency obligations | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 776.4
Fair Value | 828.4
Amount Shown in Balance Sheet | 828.4
States, municipalities and political subdivisions | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 1,519.7
Fair Value | 1,703.4
Amount Shown in Balance Sheet | 1,703.4
Foreign government bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 40.2
Fair Value | 43.6
Amount Shown in Balance Sheet | 43.6
Public utilities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 91.8
Fair Value | 100.4
Amount Shown in Balance Sheet | 100.4
All other corporate bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 2,091.6
Fair Value | 2,251.0
Amount Shown in Balance Sheet | 2,251.0
Asset-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 935.4
Fair Value | 943.2
Amount Shown in Balance Sheet | 943.2
Residential mortgage-backed securities (non-agency) | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 21.5
Fair Value | 21.6
Amount Shown in Balance Sheet | 21.6
Commercial mortgage-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 286.7
Fair Value | 310.3
Amount Shown in Balance Sheet | 310.3
Redeemable preferred stocks | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 34.4
Fair Value | 37.4
Amount Shown in Balance Sheet | 37.4
Industrial, miscellaneous and all other | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 4.7
Fair Value | 4.7
Amount Shown in Balance Sheet | 4.7
Banking & finance and insurance companies | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 1.4
Fair Value | 1.4
Amount Shown in Balance Sheet | 1.4
Public utilities | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 0.2
Fair Value | 0.2
Amount Shown in Balance Sheet | 0.2
Non-redeemable preferred stocks | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 119.4
Fair Value | 119.4
Amount Shown in Balance Sheet | 119.4
Closed-end fund | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 21.5
Fair Value | 21.5
Amount Shown in Balance Sheet | 21.5
Limited partnership interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 712.8
Amount Shown in Balance Sheet | 712.8
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 157.8
Amount Shown in Balance Sheet | 157.8
Policy loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 142.1
Amount Shown in Balance Sheet | 142.1
Derivatives |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 7.8
Fair Value | 10.7
Amount Shown in Balance Sheet | 10.7
Mortgage loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 6.7
Amount Shown in Balance Sheet | 6.7
Other |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |
Cost | 32.9
Amount Shown in Balance Sheet | $ 32.9

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