Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 367.1	$ 215.7	$ 414.9	$ 582.8	$ 690.5
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(2,184.1)		879.1	(1,529.7)	1,989.2
Other-than-temporary impairments	3.7		8.7	9.4	24.3
Pension and other postretirement benefits liability	(3.5)		(3.5)	(6.9)	(6.9)
Other comprehensive income (loss), before tax	(2,183.9)		884.3	(1,527.2)	2,006.6
Income tax expense (benefit) related to items of other comprehensive income (loss)	(761.9)		309.1	(532.7)	703.0
Other comprehensive income (loss), after tax	(1,422.0)		575.2	(994.5)	1,303.6
Comprehensive income (loss)	(1,054.9)		990.1	(411.7)	1,994.1
Less: Comprehensive income (loss) attributable to noncontrolling interest	81.9		166.6	108.0	180.1
Comprehensive income (loss) attributable to Voya Financial, Inc.'s common shareholders	$ (1,136.8)		$ 823.5	$ (519.7)	$ 1,814.0