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Financing Agreements - Guaranteed Debt (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Guaranteed debt $ 637.5 $ 828.9 $ 1,190.4
Commercial paper
     
Debt Instrument [Line Items]      
Guaranteed debt 0 192.0 554.6
Debentures
     
Debt Instrument [Line Items]      
Guaranteed debt   636.9 [1] 635.8 [1]
Lion Connecticut Holdings Inc. | Debentures
     
Debt Instrument [Line Items]      
Guaranteed debt $ 637.5 [1] $ 636.9 [1]  
[1] ING Group is guarantor to outstanding legacy debt securities originally issued by Aetna Services, Inc. (formerly Aetna Life and Casualty).