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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2024 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | $ 7,379.1
Balance Sheet | 6,916.4
Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 5,842.5
Cost or amortized cost, net | 5,387.9
Balance Sheet | 5,387.9
Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 78.8
Cost or amortized cost, net | 66.5
Balance Sheet | 66.5
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 | 1,029.0
Cost or amortized cost, net | 909.3
Balance Sheet | 909.3
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 | 1,239.1
Cost or amortized cost, net | 1,150.8
Balance Sheet | 1,150.8
Foreign government bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 14.1
Cost or amortized cost, net | 13.1
Balance Sheet | 13.1
Public utilities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 106.2
Cost or amortized cost, net | 91.1
Balance Sheet | 91.1
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 | 1,857.3
Cost or amortized cost, net | 1,660.3
Balance Sheet | 1,660.3
Asset-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,177.0
Cost or amortized cost, net | 1,170.9
Balance Sheet | 1,170.9
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 | 69.1
Cost or amortized cost, net | 68.5
Balance Sheet | 68.5
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 | 319.0
Cost or amortized cost, net | 292.9
Balance Sheet | 292.9
Redeemable preferred stocks | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 31.7
Cost or amortized cost, net | 31.0
Balance Sheet | 31.0
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 | 0.0
Cost or amortized cost, net | 0.5
Balance Sheet | 0.5
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 | 1.8
Cost or amortized cost, net | 1.5
Balance Sheet | 1.5
Non-redeemable preferred stocks | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 77.0
Cost or amortized cost, net | 64.5
Balance Sheet | 64.5
Limited partnership interests(1) |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,121.3
Balance Sheet | 1,121.3
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 101.2
Balance Sheet | 101.2
Policy loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 140.8
Balance Sheet | 140.8
Derivatives |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 14.3
Cost or amortized cost, net | 18.5
Balance Sheet | 18.5
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 | 37.0
Balance Sheet | $ 37.0

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