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Schedule 1 - Investments Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2019 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | $ 8,495.0
Amount Carried in Balance Sheet | 9,044.4
Fixed Maturities: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6,372.7
Fair Value | 6,922.1
Amount Carried in Balance Sheet | 6,922.1
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 | 784.7
Fair Value | 815.9
Amount Carried in Balance Sheet | 815.9
States and Political Subdivisions |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 1,386.4
Fair Value | 1,515.8
Amount Carried in Balance Sheet | 1,515.8
Foreign Governments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 17.2
Fair Value | 16.8
Amount Carried in Balance Sheet | 16.8
Other Bonds and Notes |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 3,465.0
Fair Value | 3,859.7
Amount Carried in Balance Sheet | 3,859.7
Redeemable Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6.8
Fair Value | 6.7
Amount Carried in Balance Sheet | 6.7
Collateralized Loan Obligations |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 624.6
Fair Value | 618.2
Amount Carried in Balance Sheet | 618.2
Other Mortgage- and Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 88.0
Fair Value | 89.0
Amount Carried in Balance Sheet | 89.0
Equity Securities at Fair Value: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 907.3
Fair Value | 907.3
Amount Carried in Balance Sheet | 907.3
Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 59.2
Fair Value | 59.2
Amount Carried in Balance Sheet | 59.2
Common Stock |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 13.2
Fair Value | 13.2
Amount Carried in Balance Sheet | 13.2
Other Equity Interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 834.9
Fair Value | 834.9
Amount Carried in Balance Sheet | 834.9
Equity Securities at Modified Cost |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 41.9
Amount Carried in Balance Sheet | 41.9
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 | 220.4
Amount Carried in Balance Sheet | 220.4
Convertible Securities at Fair Value |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 37.3
Fair Value | 37.3
Amount Carried in Balance Sheet | 37.3
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 | 444.5
Amount Carried in Balance Sheet | 444.5
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 470.9
Amount Carried in Balance Sheet | $ 470.9

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