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Financing Agreements - Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 3,515.2 $ 3,514.7
Less: Current portion of long-term debt 0 0
Long-term debt 3,515.2 3,514.7
Debentures | 7.25% Lion Connecticut Holdings Inc. debentures, due 2023
   
Debt Instrument [Line Items]    
Long-term debt 158.8 158.6
Annual interest rate on loan   7.25%
Debentures | 7.63% Lion Connecticut Holdings Inc. debentures, due 2026
   
Debt Instrument [Line Items]    
Long-term debt 232.2 232.1
Annual interest rate on loan   7.63%
Debentures | 6.97% Lion Connecticut Holdings Inc. debentures, due 2036
   
Debt Instrument [Line Items]    
Long-term debt 108.6 108.6
Annual interest rate on loan   6.97%
Notes Payable | 8.42% Equitable of Iowa Companies Capital Trust II Notes, due 2027
   
Debt Instrument [Line Items]    
Long-term debt 13.8 13.8
Annual interest rate on loan   8.42%
Property Loan | 1.00% Windsor Property Loan
   
Debt Instrument [Line Items]    
Long-term debt 4.9 4.9
Annual interest rate on loan   1.00%
Senior Notes | 5.5% Senior Notes, due 2022
   
Debt Instrument [Line Items]    
Long-term debt 849.6 849.6
Annual interest rate on loan   5.50%
Senior Notes | 2.9% Senior Notes, due 2018
   
Debt Instrument [Line Items]    
Long-term debt 998.7 998.5
Annual interest rate on loan   2.90%
Senior Notes | 5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053
   
Debt Instrument [Line Items]    
Annual interest rate on loan   5.65%
Senior Notes | 5.7% Senior Notes, due 2043
   
Debt Instrument [Line Items]    
Long-term debt 398.6 398.6
Annual interest rate on loan   5.70%
Junior Subordinated Notes (2053 Notes) | 5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053
   
Debt Instrument [Line Items]    
Long-term debt $ 750.0 $ 750.0