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Schedule 1 - 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] |
Amortized Cost | $ 9,773.9
Amount Carried in Balance Sheet | 8,888.5
Fixed Maturities: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 7,295.0
Fair Value | 6,409.6
Amount Carried in Balance Sheet | 6,409.6
United States Government and Government Agencies and Authorities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 588.6
Fair Value | 486.8
Amount Carried in Balance Sheet | 486.8
States and Political Subdivisions |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 1,457.3
Fair Value | 1,233.2
Amount Carried in Balance Sheet | 1,233.2
Foreign Governments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6.5
Fair Value | 6.6
Amount Carried in Balance Sheet | 6.6
Other Bonds and Notes |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 4,038.3
Fair Value | 3,519.6
Amount Carried in Balance Sheet | 3,519.6
Redeemable Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 9.8
Fair Value | 8.9
Amount Carried in Balance Sheet | 8.9
Collateralized Loan Obligations |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 747.8
Fair Value | 741.5
Amount Carried in Balance Sheet | 741.5
Other Mortgage- and Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 446.7
Fair Value | 413.0
Amount Carried in Balance Sheet | 413.0
Equity Securities at Fair Value: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 218.5
Fair Value | 218.5
Amount Carried in Balance Sheet | 218.5
Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 22.6
Fair Value | 22.6
Amount Carried in Balance Sheet | 22.6
Common Stock |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 1.4
Fair Value | 1.4
Amount Carried in Balance Sheet | 1.4
Other Equity Interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 194.5
Fair Value | 194.5
Amount Carried in Balance Sheet | 194.5
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 186.3
Amount Carried in Balance Sheet | 186.3
Alternative Energy Partnership Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 17.6
Amount Carried in Balance Sheet | 17.6
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 1,037.1
Amount Carried in Balance Sheet | 1,037.1
Company-Owned Life Insurance |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 539.2
Amount Carried in Balance Sheet | 539.2
Loans to Policyholders |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 280.7
Amount Carried in Balance Sheet | 280.7
Other Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 199.5
Amount Carried in Balance Sheet | $ 199.5

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