Share-Based Incentive Compensation Plans - Compensation Cost (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 32,100,000	[1]	$ 6,500,000	[1]
Tax benefit due to recognized valuation allowances	0		0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	7,000,000	[2]	4,800,000	[2]
RSUs - Deal incentive awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	5,600,000		0
Performance shares (PSU awards)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	19,200,000	[2]	900,000	[2]
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	0	[3]	800,000	[3]
Phantom Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	300,000		0
ING Group Share-based Compensation Plans | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	1,800,000
Long-term Sustainable Performance Plan | Performance shares (PSU awards)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 10,600,000

[1] The Company recognized no income tax benefit due to recognized valuation allowances for all periods presented. See Note 9. Income Taxes to these Condensed Consolidated Financial Statements for additional information.

[2] This table includes compensation costs of $1.8 and $10.6 with respect to ING Group RSUs and PSU awards, respectively, for the three months ended March 31, 2014. For the three months ended March 31, 2013, all share-based compensation costs are related to the ING Group equity-based compensation plans.

[3] All compensation costs recognized during the three months ended March 31, 2013 represents the associated portion with ING Group stock options held by the Company's employees.