Earnings per Common Share Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Net income (loss)	$ (160.4)	$ 116.2	$ 367.1	$ 215.7	$ 1,319.8	$ 522.4	$ 414.9	$ 275.6	$ 538.6	$ 2,532.7	$ 788.6
Less: Net income (loss) attributable to noncontrolling interest	(53.6)	75.9	81.9	26.1	(59.0)	116.6	166.6	13.5	130.3	237.7	190.1
Net income (loss) available to Voya Financial, Inc.'s common shareholders	$ (106.8)	$ 40.3	$ 285.2	$ 189.6	$ 1,378.8	$ 405.8	$ 248.3	$ 262.1	$ 408.3	$ 2,295.0	$ 598.5
Basic (shares)									225.4	253.1	250.6
Diluted (shares)									227.4	255.1	251.8
Basic (usd per share)	$ (0.50)	$ 0.18	$ 1.25	$ 0.80	$ 5.65	$ 1.61	$ 0.98	$ 1.00	$ 1.81	$ 9.07	$ 2.39
Diluted (usd per share)	$ (0.49)	$ 0.18	$ 1.24	$ 0.79	$ 5.60	$ 1.59	$ 0.97	$ 0.99	$ 1.80	$ 9.00	$ 2.38
Restricted Share Units (RSUs)
Class of Stock [Line Items]
Dilutive Effects (shares)									1.8	1.3	0.6
RSUs - Deal incentive awards
Class of Stock [Line Items]
Dilutive Effects (shares)									0.0	0.3	0.4
PSU awards
Class of Stock [Line Items]
Dilutive Effects (shares)									0.2	0.4	0.2