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Derivative Instruments (Narrative Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Derivative Instruments [Abstract]    
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges $ 5,500,000 $ 16,400,000
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives 60,400,000 93,300,000
Maximum Potential Future Exposure on Credit Risk Derivatives 698,700,000 696,000,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 800,000  
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk 1,700,000 63,500,000
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk $ 11,900,000 $ 37,000,000