Shareholders' Equity and Earnings Per Common Share - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			3 Months Ended			0 Months Ended
	Mar. 25, 2014	Mar. 13, 2014	Feb. 06, 2014	Mar. 31, 2014	Mar. 31, 2013	May 07, 2013	Mar. 31, 2014 ING U.S. Inc.	Mar. 25, 2014 ING U.S. Inc.
Class of Stock [Line Items]
Share repurchase program, authorized amount		$ 300.0
Shares repurchased							250,000	7,255,853
Shares repurchased, value				258.9	0		8.9	250.0
Remaining authorized amount	50.0
Shares paid for tax withholding obligations				306,408
Number of warrants issued and outstanding						26,050,846
Percentage of issued warrants to total shares issued and outstanding						9.99%
Exercise price of warrants						48.75
Fair value of warrants issued						$ 94.0
Cash dividends declared per share of common stock			$ 0.01	$ 0.01	$ 0