Business, Basis of Presentation and Significant Accounting Policies (Details)	0 Months Ended	6 Months Ended	0 Months Ended
	May 07, 2013	Jun. 30, 2013 segment	May 07, 2013 ING U.S. Inc.	May 31, 2013 ING International	May 07, 2013 ING International	Jun. 30, 2013 ING International
Item Effected [Line Items]
Offering of shares by parent company and subsidiaries	65,192,307		30,769,230		34,423,077
Ownership by affiliate of parent company following IPO					9,778,846
Maximum number of shares granted to be acquired by affiliate's employees of parent				9,778,696
Additional shares acquired by affiliate's employees of parent				71.00%	75.00%	71.00%
Number of operating segments		1