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Schedule I - Summary of Investments, Other Than Investments in Related Parties Schedule I - Summary of Investments, Other Than Investments in Related Parties (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost $ 19,087.2 [1]
Fair Value 19,111.1
Amount at which shown in the balance sheet 19,110.7
United States Government and government agencies and authorities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 367.9 [1]
Fair Value 381.5
Amount at which shown in the balance sheet 381.5
States, municipalities and political subdivisions  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,519.7 [1]
Fair Value 1,607.6
Amount at which shown in the balance sheet 1,607.6
Foreign governments  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 7.3 [1]
Fair Value 6.8
Amount at which shown in the balance sheet 6.8
Public utilities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,892.9 [1]
Fair Value 1,849.0
Amount at which shown in the balance sheet 1,849.0
All other corporate bonds  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 13,440.5 [1]
Fair Value 13,502.5
Amount at which shown in the balance sheet 13,502.5
Redeemable preferred stock  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 163.2 [1]
Fair Value 167.4
Amount at which shown in the balance sheet 167.4
Total fixed maturities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 17,391.5 [1]
Fair Value 17,514.8
Amount at which shown in the balance sheet 17,514.8
Banks, trust, and insurance companies  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 57.9 [1]
Fair Value 57.7
Amount at which shown in the balance sheet 57.7
Industrial, miscellaneous and all other  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 18.7 [1]
Fair Value 32.8
Amount at which shown in the balance sheet 32.8
Nonredeemable preferred stock  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 535.5 [1]
Fair Value 558.9
Amount at which shown in the balance sheet 558.9
Total equity securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 612.1 [1]
Fair Value 649.4
Amount at which shown in the balance sheet 649.4
Derivative investments  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 219.0 [1]
Fair Value 81.9
Amount at which shown in the balance sheet 81.9
Asset-based loans  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 335.8 [1]
Fair Value 335.8
Amount at which shown in the balance sheet 335.8
Commercial mortgage loans  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 489.2 [1]
Amount at which shown in the balance sheet 489.2
Other invested assets  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 39.6 [1]
Fair Value 39.6
Amount at which shown in the balance sheet $ 39.6
[1] (a)Represents (i) original cost reduced by repayments and other-than-temporary impairments and adjusted for amortization of premiums and accrual of discounts for fixed maturity securities, (ii) original cost reduced by other-than-temporary impairments for equity securities, (iii) original cost for derivative investments, and (iv) unpaid principal balance reduced by an allowance for credit losses for commercial-mortgage and asset-based loans.