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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2022 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | $ 7,162.7
Balance Sheet | 6,587.6
Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 5,756.9
Cost or amortized cost, net | 5,185.0
Balance Sheet | 5,185.0
Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 99.6
Cost or amortized cost, net | 99.6
Balance Sheet | 99.6
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 | 830.4
Cost or amortized cost, net | 715.4
Balance Sheet | 715.4
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 | 1,380.9
Cost or amortized cost, net | 1,269.7
Balance Sheet | 1,269.7
Foreign government bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 35.2
Cost or amortized cost, net | 33.6
Balance Sheet | 33.6
Public utilities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 101.8
Cost or amortized cost, net | 86.1
Balance Sheet | 86.1
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 | 2,022.2
Cost or amortized cost, net | 1,782.4
Balance Sheet | 1,782.4
Asset-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,006.7
Cost or amortized cost, net | 954.8
Balance Sheet | 954.8
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 | 12.9
Cost or amortized cost, net | 11.7
Balance Sheet | 11.7
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 | 329.6
Cost or amortized cost, net | 298.1
Balance Sheet | 298.1
Redeemable preferred stocks | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 37.2
Cost or amortized cost, net | 33.2
Balance Sheet | 33.2
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 | 0.8
Cost or amortized cost, net | 0.8
Balance Sheet | 0.8
Non-redeemable preferred stocks | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 81.8
Cost or amortized cost, net | 81.8
Balance Sheet | 81.8
Closed-end fund | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 16.7
Cost or amortized cost, net | 16.7
Balance Sheet | 16.7
Limited partnership interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 983.7
Balance Sheet | 983.7
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 109.4
Balance Sheet | 109.4
Policy loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 139.3
Balance Sheet | 139.3
Derivatives |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 10.0
Cost or amortized cost, net | 6.8
Balance Sheet | 6.8
Mortgage loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 32.0
Balance Sheet | 32.0
Other |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 31.8
Balance Sheet | $ 31.8

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