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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2023 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | $ 7,241.6
Balance Sheet | 6,830.5
Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 5,652.9
Cost or amortized cost, net | 5,235.3
Balance Sheet | 5,235.3
Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 86.2
Cost or amortized cost, net | 86.2
Balance Sheet | 86.2
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 [Line Items] |
Cost | 925.0
Cost or amortized cost, net | 819.2
Balance Sheet | 819.2
States, municipalities and political subdivisions | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,333.4
Cost or amortized cost, net | 1,270.1
Balance Sheet | 1,270.1
Foreign government bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 23.1
Cost or amortized cost, net | 22.1
Balance Sheet | 22.1
Public utilities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 93.8
Cost or amortized cost, net | 80.9
Balance Sheet | 80.9
All other corporate bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,850.0
Cost or amortized cost, net | 1,665.5
Balance Sheet | 1,665.5
Asset-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,044.7
Cost or amortized cost, net | 1,020.5
Balance Sheet | 1,020.5
Residential mortgage-backed securities (non-agency) | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 13.9
Cost or amortized cost, net | 12.9
Balance Sheet | 12.9
Commercial mortgage-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 342.9
Cost or amortized cost, net | 317.8
Balance Sheet | 317.8
Redeemable preferred stocks | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 26.1
Cost or amortized cost, net | 26.3
Balance Sheet | 26.3
Industrial, miscellaneous and all other | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 0.3
Cost or amortized cost, net | 0.3
Balance Sheet | 0.3
Banking & finance and insurance companies | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1.1
Cost or amortized cost, net | 1.1
Balance Sheet | 1.1
Non-redeemable preferred stocks | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 68.3
Cost or amortized cost, net | 68.3
Balance Sheet | 68.3
Closed-end fund | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 16.5
Cost or amortized cost, net | 16.5
Balance Sheet | 16.5
Limited partnership interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,138.8
Balance Sheet | 1,138.8
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 132.9
Balance Sheet | 132.9
Policy loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 141.4
Balance Sheet | 141.4
Derivatives |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 12.5
Cost or amortized cost, net | 19.0
Balance Sheet | 19.0
Mortgage loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 43.2
Balance Sheet | 43.2
Other |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 33.7
Balance Sheet | $ 33.7

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