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Investments in Unconsolidated Affiliates (Details 2) (Symetra, USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Y
Dec. 31, 2011
technique
Symetra
    
Investments in unconsolidated affiliates    
Investments in unconsolidated affiliates (in shares) 17.4 17.4
Additional common shares 9.5 9.5
Fair value of investment   $ 261.0
Estimated fair value of investment per share   $ 15
After-tax equity in losses of unconsolidated affiliates   45.9
Equity in net unrealized gains (losses)   136.6
Ownership interest (as a percent) 15.00%  
Number of valuation techniques   3
Difference between fair value and carrying amount   195.8
Term of amortization (in years) 30  
Risk free interest rate (as a percent) 0.39%  
After tax amortization through equity in earnings 1.0  
After tax amortization through equity in net unrealized losses 3.0  
Pre-tax unamortized basis difference $ 191.5  
Volatility rate (as a percent) 35.20%  
Expected life (in years) 2.33  
Strike price (in dollars per share) $ 11.49