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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) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost $ 18,409.8 [1]
Fair Value 19,252.5
Amount at which shown in the balance sheet 19,252.5
United States Government and government agencies and authorities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 395.3 [1]
Fair Value 403.3
Amount at which shown in the balance sheet 403.3
States, municipalities and political subdivisions
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,149.9 [1]
Fair Value 1,259.8
Amount at which shown in the balance sheet 1,259.8
Foreign governments
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 13.1 [1]
Fair Value 12.9
Amount at which shown in the balance sheet 12.9
Public utilities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 1,822.2 [1]
Fair Value 1,922.4
Amount at which shown in the balance sheet 1,922.4
All other corporate bonds
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 12,968.2 [1]
Fair Value 13,492.4
Amount at which shown in the balance sheet 13,492.4
Redeemable preferred stock
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 120.0 [1]
Fair Value 120.7
Amount at which shown in the balance sheet 120.7
Total fixed maturities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 16,468.7 [1]
Fair Value 17,211.5
Amount at which shown in the balance sheet 17,211.5
Banks, trust, and insurance companies
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 98.4 [1]
Fair Value 85.4
Amount at which shown in the balance sheet 85.4
Industrial, miscellaneous and all other
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 141.2 [1]
Fair Value 104.5
Amount at which shown in the balance sheet 104.5
Nonredeemable preferred stock
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 547.3 [1]
Fair Value 578.2
Amount at which shown in the balance sheet 578.2
Total equity securities
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 786.9 [1]
Fair Value 768.1
Derivative investments
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 177.7 [1]
Fair Value 296.3
Amount at which shown in the balance sheet 296.3
Asset-based loans
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 811.6 [1]
Fair Value 811.6
Amount at which shown in the balance sheet 811.6
Policy loans
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 10.6 [1]
Fair Value 10.6
Amount at which shown in the balance sheet 10.6
Other invested assets
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized Cost 154.3 [1]
Fair Value 154.4
Amount at which shown in the balance sheet $ 154.4
[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.