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Schedule 1 - 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 [Line Items] |
Amortized Cost | $ 9,758.7
Amount Carried in Balance Sheet | 10,387.4
Fixed Maturities: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 7,358.2
Fair Value | 7,986.9
Amount Carried in Balance Sheet | 7,986.9
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 | 610.1
Fair Value | 637.4
Amount Carried in Balance Sheet | 637.4
States and Political Subdivisions |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 1,752.5
Fair Value | 1,890.1
Amount Carried in Balance Sheet | 1,890.1
Foreign Governments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6.7
Fair Value | 5.5
Amount Carried in Balance Sheet | 5.5
Other Bonds and Notes |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 3,929.0
Fair Value | 4,386.9
Amount Carried in Balance Sheet | 4,386.9
Redeemable Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 7.0
Fair Value | 7.4
Amount Carried in Balance Sheet | 7.4
Collateralized Loan Obligations |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 756.0
Fair Value | 752.1
Amount Carried in Balance Sheet | 752.1
Other Mortgage- and Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 296.9
Fair Value | 307.5
Amount Carried in Balance Sheet | 307.5
Equity Securities at Fair Value: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 830.6
Fair Value | 830.6
Amount Carried in Balance Sheet | 830.6
Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 51.8
Fair Value | 51.8
Amount Carried in Balance Sheet | 51.8
Common Stock |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 21.8
Fair Value | 21.8
Amount Carried in Balance Sheet | 21.8
Other Equity Interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 757.0
Fair Value | 757.0
Amount Carried in Balance Sheet | 757.0
Equity Securities at Modified Cost |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 32.3
Amount Carried in Balance Sheet | 32.3
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 | 241.9
Amount Carried in Balance Sheet | 241.9
Convertible Securities at Fair Value |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 46.4
Fair Value | 46.4
Amount Carried in Balance Sheet | 46.4
Loans, Real Estate and Other Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 925.6
Amount Carried in Balance Sheet | 925.6
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 284.1
Amount Carried in Balance Sheet | 284.1
Alternative Energy Partnership Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 39.6
Amount Carried in Balance Sheet | $ 39.6

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