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Schedule I - Summary of Investments, Other Than Investments in Related Parties (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost $ 16,190.1 [1]
Fair Value 16,465.9
Amount at which shown in the balance sheet 16,465.9
United States Government and government agencies and authorities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,095.0 [1]
Fair Value 1,100.4
Amount at which shown in the balance sheet 1,100.4
States, municipalities and political subdivisions
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,014.8 [1]
Fair Value 1,023.5
Amount at which shown in the balance sheet 1,023.5
Foreign governments
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 20.0 [1]
Fair Value 19.7
Amount at which shown in the balance sheet 19.7
Public utilities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,586.9 [1]
Fair Value 1,634.8
Amount at which shown in the balance sheet 1,634.8
Convertibles and bonds with warrants attached
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 0 [1]
Fair Value 0
Amount at which shown in the balance sheet 0
All other corporate bonds
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 11,345.4 [1]
Fair Value 11,521.6
Amount at which shown in the balance sheet 11,521.6
Redeemable preferred stock
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 0 [1]
Fair Value 0
Amount at which shown in the balance sheet 0
Total fixed maturities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 15,062.1 [1]
Fair Value 15,300.0
Amount at which shown in the balance sheet 15,300.0
Public utilities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 0 [1]
Fair Value 0
Amount at which shown in the balance sheet 0
Banks, trust, and insurance companies
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 143.2 [1]
Fair Value 130.4
Amount at which shown in the balance sheet 130.4
Industrial, miscellaneous and all other
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 69.5 [1]
Fair Value 40.8
Amount at which shown in the balance sheet 40.8
Nonredeemable preferred stock
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 182.0 [1]
Fair Value 181.3
Amount at which shown in the balance sheet 181.3
Total equity securities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 394.7 [1]
Fair Value 352.5
Amount at which shown in the balance sheet 352.5
Derivative investments
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 141.7 [1]
Fair Value 221.8
Amount at which shown in the balance sheet 221.8
Asset-based loans
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 560.4 [1]
Fair Value 560.4
Amount at which shown in the balance sheet 560.4
Policy loans
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 20.5 [1]
Fair Value 20.5
Amount at which shown in the balance sheet 20.5
Other long-term investments
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 10.7 [1]
Fair Value 10.7
Amount at which shown in the balance sheet $ 10.7
[1] 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 asset-based loans.