Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets	$ 11.1	$ 11.1
Increase (decrease) in valuation allowance	0		(109.0)
Current income tax payable to Parent	74.1	32.1
Foreign tax credits
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets	11.1
Tax valuation allowance allocated to Net income (loss)
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets	130.4	62.8
Increase (decrease) in valuation allowance	67.6	0	(87.0)
Tax valuation allowance allocated to Other comprehensive income
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets	(119.3)	(51.7)
Increase (decrease) in valuation allowance	(67.6)	0	(22.0)
ING U.S. Inc
Valuation Allowance [Line Items]
Current income tax payable to Parent	$ 74.1	$ 32.1