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Variable Annuity Reinsurance (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Variable annuity benefit guarantee liabilities
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities 548.5
Variable annuity benefit guarantee liabilities | Discounted cash flows | Minimum
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Surrenders (as a percent) 0.10%
Mortality (as a percent) 0.10%
Foreign exchange volatilities (as a percent) 12.10%
Index volatilities (as a percent) 11.90%
Variable annuity benefit guarantee liabilities | Discounted cash flows | Maximum
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Surrenders (as a percent) 3.00%
Mortality (as a percent) 3.10%
Foreign exchange volatilities (as a percent) 28.70%
Index volatilities (as a percent) 30.20%
Variable annuity benefit guarantee liabilities | Discounted cash flows | Weighted Average
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Surrenders (as a percent) 0.70%
Mortality (as a percent) 1.30%
Foreign exchange volatilities (as a percent) 16.90%
Index volatilities (as a percent) 22.80%
Foreign exchange and equity index options
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities 183.8
Foreign exchange and equity index options | Black-Scholes option pricing model | Minimum
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Foreign exchange volatilities (as a percent) 12.10%
Index volatilities (as a percent) 11.90%
Expected equity dividends (as a percent) 1.40%
Foreign exchange and equity index options | Black-Scholes option pricing model | Maximum
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Foreign exchange volatilities (as a percent) 28.70%
Index volatilities (as a percent) 30.20%
Expected equity dividends (as a percent) 6.20%
Foreign exchange and equity index options | Black-Scholes option pricing model | Weighted Average
  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Foreign exchange volatilities (as a percent) 16.90%
Index volatilities (as a percent) 22.80%
Expected equity dividends (as a percent) 2.70%