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Schedule 1 - Investments Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2020 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | $ 9,510.9
Amount Carried in Balance Sheet | 10,424.1
Fixed Maturities: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6,692.7
Fair Value | 7,605.9
Amount Carried in Balance Sheet | 7,605.9
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 | 536.5
Fair Value | 585.3
Amount Carried in Balance Sheet | 585.3
States and Political Subdivisions |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 1,404.3
Fair Value | 1,589.5
Amount Carried in Balance Sheet | 1,589.5
Foreign Governments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6.6
Fair Value | 5.2
Amount Carried in Balance Sheet | 5.2
Other Bonds and Notes |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 3,749.5
Fair Value | 4,425.4
Amount Carried in Balance Sheet | 4,425.4
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 | 7.5
Amount Carried in Balance Sheet | 7.5
Collateralized Loan Obligations |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 785.1
Fair Value | 767.7
Amount Carried in Balance Sheet | 767.7
Other Mortgage- and Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 203.7
Fair Value | 225.3
Amount Carried in Balance Sheet | 225.3
Equity Securities at Fair Value: |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 858.5
Fair Value | 858.5
Amount Carried in Balance Sheet | 858.5
Preferred Stocks |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 59.1
Fair Value | 59.1
Amount Carried in Balance Sheet | 59.1
Common Stock |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 10.8
Fair Value | 10.8
Amount Carried in Balance Sheet | 10.8
Other Equity Interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 788.6
Fair Value | 788.6
Amount Carried in Balance Sheet | 788.6
Equity Securities at Modified Cost |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 40.1
Amount Carried in Balance Sheet | 40.1
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 | 225.3
Amount Carried in Balance Sheet | 225.3
Convertible Securities at Fair Value |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 39.9
Fair Value | 39.9
Amount Carried in Balance Sheet | 39.9
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 | 779.0
Amount Carried in Balance Sheet | 779.0
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 875.4
Amount Carried in Balance Sheet | $ 875.4

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