Business, Basis of Presentation and Significant Accounting Policies (Details)	9 Months Ended	0 Months Ended
	Sep. 30, 2013 segment	May 07, 2013 ING U.S. Inc.	May 07, 2013 ING International	Oct. 29, 2013 Subsequent Event ING U.S. Inc.	Oct. 29, 2013 Subsequent Event ING International
Item Effected [Line Items]
Offering of shares by parent company and subsidiaries		30,769,230	44,201,773
Offering of shares by parent company and subsidiaries				37,950,000
Ownership by affiliate of parent company					57.00%
Number of operating segments	1