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Derivative Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 0.6   $ 0.6    
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges 3.8   3.8   (16.4)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives (24.5) (20.6) (137.2) (31.8)  
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk 1.0 (6.2) (1.0) (63.4)  
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk $ (3.7) $ (28.3) $ (8.6) $ 23.2