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Benefit Plans (Defined Benefit Plan) (Details) (ING Americas Retirement Plan, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, transition from old formula to new formula, credit earned by participants, percentage of annual pay	4.00%
Defined benefit plan, interest credit, description of variable rate basis	30-year U.S. Treasury securities bond rate
Defined benefit plan, transition period from old formula to new formula	2 years
Operating Expenses
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, cost allocated	$ 19.1	$ 24.6	$ 27.2

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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