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Benefit Plans (Stock Option and Share Plans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Option and Share Plans [Abstract]      
Tax benefit from allocated stock option and share plan expenses $ 1.5 $ 0.8 $ 0.7
Benefit charges allocated 11.9 9.9 11.9
Long-term Equity Ownership Plan | Stock Options
     
Stock Option and Share Plans [Abstract]      
Award term 10 years    
Award vesting period 3 years    
Stock options, vesting condition, service period 3 years    
Options, exercise term upon vesting (up to seven years) 7 years    
Allocated stock option and share plan expenses 5.0    
Long-term Equity Ownership Plan | Performance Shares
     
Stock Option and Share Plans [Abstract]      
Award vesting period 3 years    
Grant amount, percentage of target, minimum 0.00%    
Grant amount, percentage of target, maximum 200.00%    
Allocated stock option and share plan expenses   5.1  
Long-term Sustainable Performance Plan
     
Stock Option and Share Plans [Abstract]      
Allocated stock option and share plan expenses     $ 3.4
Long-term Sustainable Performance Plan | Performance Shares
     
Stock Option and Share Plans [Abstract]      
Award vesting period 3 years    
Award vesting percentage per year 33.33%    
ING 401(k) Plan for ILIAC Agents
     
Stock Option and Share Plans [Abstract]      
Maximum annual contribution per employee 60.00%    
Company match, percentage of participant's eligible compensation 6.00%