485BPOS

As filed with the Securities and Exchange Commission on October 15, 2012

Securities Act File No. 33-41694

Investment Company Act File No. 811-06352

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

Registration Statement Under The Securities Act Of 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 159	x
and/or
Registration Statement Under The Investment Company Act Of 1940	x
Amendment No. 170 (Check appropriate box or boxes)	x

ING SERIES FUND, INC.

(Exact Name of Registrant Specified in Charter)

7337 East Doubletree Ranch Road, Suite 100

Scottsdale, Arizona 85258

(Address of Principal Executive Offices)

Registrant’s Telephone Number, Including Area Code: (800) 992-0180

Huey P. Falgout, Jr., Esq. ING Investments, LLC 7337 East Doubletree Ranch Road Scottsdale, Arizona 85258 (Name and Address of Agent for Service) With copies to: Philip H. Newman, Esq. Goodwin Procter LLP Exchange Place 53 State Street Boston, Massachusetts 02109

It is proposed that this filing will become effective (check appropriate box):

x	Immediately upon filing pursuant to paragraph (b)	¨	On (date) pursuant to paragraph (a)(1)
¨	On (date) pursuant to paragraph (b)	¨	75 days after filing pursuant to paragraph (a)(2)
¨	60 days after filing pursuant to paragraph (a)(1)	¨	On (date), pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designated a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “1933 Act”), and the Investment Company Act of 1940, as amended, the Registrant certifies that it that it has duly caused this Post-Effective Amendment No. 159 to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Scottsdale and State of Arizona on the 15^th day of October, 2012.

	ING SERIES FUND, INC.
By:	/s/ Theresa K. Kelety
	Theresa K. Kelety   Secretary

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

SIGNATURE	TITLE	DATE
	President, Chief Executive	October 15, 2012
Shaun P. Mathews*	Officer and Interested Director
	Senior Vice President and	October 15, 2012
Todd Modic*	Chief/Principal Financial Officer
	Director	October 15, 2012
Albert E. DePrince Jr.*
	Director	October 15, 2012
Martin J. Gavin*
	Director	October 15, 2012
Russell H. Jones*
	Director	October 15, 2012
Sidney Koch*
	Director	October 15, 2012
Joseph E. Obermeyer*

*By:	/s/ Theresa K. Kelety
	Theresa K. Kelety
	Attorney-in-Fact**

** Powers of attorney for Todd Modic and each Director were attached to Post-Effective Amendment No. 155 to the Registrant’s Form N-1A Registration Statement on July 27, 2012 and incorporated herein by reference.

EXHIBIT INDEX

ING Series Fund, Inc.

Exhibit Number	Exhibit Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

ING Capital Allocation Fund

ING Capital Allocation Fund

INVESTMENT OBJECTIVE

The Fund seeks to provide total return consisting of capital growth, both realized and unrealized, and current income.

FEES AND EXPENSES OF THE FUND

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 40) or the Statement of Additional Information (page 134).

Shareholder Fees
Fees paid directly from your investment

Shareholder Fees ING Capital Allocation Fund	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
Class A	5.75%	none	[1]
Class B	none	5.00%
Class C	none	1.00%
Class I	none	none
Class O	none	none
Class W	none	none

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Annual Fund Operating Expenses ING Capital Allocation Fund		Class A	Class B	Class C	Class I	Class O	Class W
Management Fees		0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	[1]
Distribution and/or Shareholder Services (12b-1) Fees		0.25%	1.00%	1.00%	none	0.25%	none	[1]
Administrative Services Fees		0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	[1]
Other Expenses		0.17%	0.17%	0.17%	0.11%	0.17%	0.17%	[1]
Acquired Fund Fees and Expenses		0.77%	0.77%	0.77%	0.77%	0.77%	0.77%	[1]
Total Annual Fund Operating Expenses	[2]	1.35%	2.10%	2.10%	1.04%	1.35%	1.10%	[1]
Waivers and Reimbursements	[3]	(0.20%)	(0.20%)	(0.20%)	(0.14%)	(0.20%)	(0.20%)	[1]
Total Annual Fund Operating Expenses after Waivers and Reimbursements		1.15%	1.90%	1.90%	0.90%	1.15%	0.90%	[1]

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example ING Capital Allocation Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	685	959	1,254	2,089
Class B	693	939	1,311	2,223
Class C	293	639	1,111	2,415
Class I	92	317	560	1,258
Class O	117	408	720	1,606
Class W	92	330	587	1,322

Expense Example, No Redemption ING Capital Allocation Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	685	959	1,254	2,089
Class B	193	639	1,111	2,223
Class C	193	639	1,111	2,415
Class I	92	317	560	1,258
Class O	117	408	720	1,606
Class W	92	330	587	1,322

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.

During the most recent fiscal year, the Fund’s portfolio turnover rate was 114% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the sub-adviser (“Sub-Adviser”) invests the assets of the Fund in a combination of Underlying Funds that, in turn, invest directly in securities (such as stocks and bonds). Under normal market conditions, approximately 65% of the Fund’s net assets will be allocated to Underlying Funds that invest in equity securities, and approximately 35% of the Fund’s net assets will be allocated to Underlying Funds that invest in fixed-income securities, including U.S. government securities and money market instruments (“Target Allocations”). The percentage weight of the Fund’s assets invested in Underlying Funds that invest in equity securities may range from 25-80%. The percentage weight of the Fund’s assets invested in Underlying Funds that invest in fixed-income securities may range from 20-50%. The asset allocation limits apply at the time of purchase of a particular security.

The Target Allocations are measured with reference to the primary investment strategies of the Underlying Funds; actual exposure to these asset classes will vary from the Target Allocations if an Underlying Fund is not substantially invested in accordance with its primary investment strategies.

The Underlying Funds provide exposure to a wide range of traditional asset classes which include stocks, bonds and cash and non-traditional asset classes (also known as alternative strategies) which includes real estate, commodities, and floating rate loans. In addition, the Sub-Adviser may seek to enhance returns and/or moderate volatility through investment strategies such as tactical asset allocation, option strategies, including but not limited to, covered call writing, puts, calls and spreads, and defensive cash positioning.

The Fund may also allocate in the future to the following asset class: absolute return strategies. Absolute return strategies are intended to produce returns that may not be correlated or are inversely correlated with equity index performance. There can be no assurance that the allocation will occur.

The Sub-Adviser uses a proprietary asset allocation strategy to determine the Target Allocations for the Fund. The Sub-Adviser uses asset allocation models to determine how much to invest in the various asset classes, regions, styles, and strategies.

The equity securities in which the Underlying Funds may invest include, but are not limited to: domestic and international stocks of companies of any market capitalization; emerging market securities; domestic and international real estate stocks, including real estate investment trusts (“REITs”); and natural resource/commodity securities.

The fixed-income securities in which the Underlying Funds may invest include, but are not limited to: domestic and international short-, intermediate- and long-term bonds; high-yield debt securities rated below investment grade commonly referred to as “junk bonds;” treasury inflation protected securities (“TIPS”); and fixed-income securities without limitations on maturity.

The Fund may also invest in derivative instruments including futures, swaps (including interest rate swaps, total return swaps, and credit default swaps), puts, calls and spreads to make tactical allocations, as a substitute for taking a position in the underlying assets, and to assist in managing cash.

The Fund may invest in exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Fund may also invest in other securities to gain exposure to asset classes, to make tactical asset allocations, to seek to minimize risk, and to assist in managing cash. The Fund may hold up to 25% of its assets in cash and cash equivalents to generate alpha and limit downside in volatile market environments. In addition to other short-term investments, the Fund may invest in affiliated registered and unregistered money market funds to manage the Fund’s cash pending investment in other strategies.

The Fund may also employ a strategy (the “Option Strategy”) of writing (selling) call options (each a “Call Option”) on indices, exchange-traded funds, and/or baskets of securities in an attempt to generate gains from option premiums to seek to increase total return and to seek to reduce volatility. Because the performance of the securities underlying each Call Option are expected to correlate closely with the performance of one or more Underlying Funds, during the term of each written Call Option the Fund will be effectively giving up all or a portion of the benefits it would otherwise realize from a potential increase in the value of such Underlying Funds. Thus, the Option Strategy may limit the Fund’s ability to benefit from appreciation of Underlying Funds. At the same time, the premium received in connection with the sale of Call Options may partially offset potential declines in value of the Underlying Funds during periods of declining markets.
Additionally, the Fund may employ an options “collar” strategy (the “Collar Strategy”) by purchasing and selling put options and writing call options on equity indices, exchange-traded funds, and baskets of securities, correlated with the Fund’s portfolio, or Underlying Funds held in the Fund’s portfolio in order to partially reduce the exposure of the Fund to declines in the value of the Underlying Funds in its portfolio and to generate capital gains in declining markets by employing put spreads and generating premiums from writing call options.
The net notional value of the call and put options entered into via the Option Strategy and the Collar Strategy may not exceed 25% of the Fund’s net assets.

The adviser (“Adviser”) oversees the Sub-Adviser in managing the Fund. The Target Allocations may be changed by the Sub-Adviser at any time, and actual allocations of the Fund’s assets will often deviate from the Target Allocations due to a “Tactical Asset Allocation Strategy.” The Tactical Asset Allocation Strategy will seek to evaluate the attractiveness of a range of asset classes and investment strategies to position the Fund to benefit from pricing inefficiencies. The Tactical Asset Allocation Strategy seeks to derive its source of outperformance from macro or “top down” decisions. The Fund may be rebalanced periodically to return to the Target Allocations and inflows and outflows may be managed to attain the Target Allocations.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. The value of your investment in the Fund changes with the values of the Underlying Funds and their investments. Any of the following risks, among others, could affect the Fund’s or an Underlying Fund’s performance or cause the Fund or an Underlying Fund to lose money or to underperform market averages of other funds.

Asset Allocation    Assets will be allocated among Underlying Funds and markets based on judgments by the Adviser or Sub-Adviser. There is a risk that the Fund may allocate assets to an Underlying Fund or asset class that underperforms other funds or asset classes.

Call    During periods of falling interest rates, a bond issuer may “call” or repay its high-yielding bond before the bond’s maturity date. If forced to invest the unanticipated proceeds at lower interest rates, the Fund or an Underlying Fund would experience a decline in income.

Commodities    The operations and financial performance of companies in natural resources industries may be directly affected by commodity prices. This risk is exacerbated for those natural resources companies that own the underlying commodity.

Company    The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Credit    Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.

Credit Default Swaps    The Fund or an Underlying Fund may enter into credit default swaps, either as a buyer or a seller of the swap. As a buyer of the swap, the Fund or an Underlying Fund pays a fee to protect against the risk that a security held by the Fund or the Underlying Fund will default. As a seller of the swap, the Fund or an Underlying Fund receives payment(s) in return for its obligation to pay the counterparty the full national value of the security in the event of a default of the security issuer. As a seller of a swap, the Fund or an Underlying Fund would effectively add leverage to its portfolio because, in addition to its total net assets, the Fund or an Underlying Fund would be subject to investment exposure on the notional value of the swap. Credit default swaps are largely unregulated and susceptible to liquidity, credit, and counterparty risks.

Currency    To the extent that the Fund or an Underlying Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.
Derivative Instruments    Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund or an Underlying Fund and reduce its returns.
Foreign Investments/Developing and Emerging Markets    Investing in foreign (non-U.S.) securities may result in the Fund or the Underlying Funds experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets.

High-Yield Securities    Investments rated below investment-grade (or of similar quality if unrated) are known as “high-yield securities” or “junk bonds.” High-yield securities are subject to greater levels of credit and liquidity risks. High-yield securities are considered primarily speculative with respect to the issuer’s continuing ability to make principal and interest payments.

Inflation-Indexed Bonds    If the index measuring inflation falls, the principal value of inflation-indexed bonds will be adjusted downward, and consequently the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-indexed bonds. For bonds that do not provide a similar guarantee, the adjusted principal value of the bond repaid at maturity may be less than the original principal.

Interest Rate    With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.

Investment Model    The Fund or certain Underlying Funds invest based on a proprietary model managed by the manager. The manager’s proprietary model may not adequately address existing or unforeseen market factors or the interplay between such factors.

Liquidity    If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market     Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods.

Market Capitalization    Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Fund or an Underlying Fund that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns.

Options    The Fund could lose money if it sells call options on securities or indices whose value then rises above the buyer’s exercise price. By selling call options to hedge against the risk of loss on its investments, the Fund could miss out on gains.

Other Investment Companies    The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.
Over-the-Counter Investments    Investments purchased over-the-counter (“OTC”), including securities and derivatives, can involve greater risks than securities traded on recognized stock exchanges. OTC securities are generally securities of smaller or newer companies that may have limited product lines and markets compared to larger companies. They also can have less management depth, more reliance on key personnel, and less access to capital and credit. OTC securities tend to trade less frequently and in lower volume, and as a result have greater liquidity risk. Many of the protections afforded to participants on some organized exchanges, such as the performance guarantee of an exchange clearing house, are not available in connection with OTC derivatives transactions. Additionally, OTC investments are generally purchased either directly from a dealer or in negotiated transactions with the issuer and as such may expose an Underlying Fund to counterparty risk.

Proprietary Hedge Fund Beta Strategy    Because the Fund may allocate assets to an Underlying Fund that seeks to deliver returns that approximate the beta component of the broad universe of hedge fund returns, the Fund’s performance may be lower than the returns of the broader stock market.

Real Estate Companies and Real Estate Investment Trusts (“REITs”)    Investing in real estate companies and REITs may subject the Fund to risks similar to those associated with the direct ownership of real estate, including losses from casualty or condemnation, changes in local and general economic conditions, supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes, and operating expenses in addition to terrorist attacks, war, or other acts that destroy real property.

Short Exposures    The Fund may invest in an Underlying Fund that takes short exposure on market indices by investing in an instrument or derivative that rises in value with a fall in the related index. If the price of the index rises while an Underlying Fund has a short exposure to it, the Underlying Fund may have to cover its short exposure at a loss. Short exposures are subject to credit risks related to the counterparty’s ability to perform its obligations and, further, that any deterioration in the counterparty’s creditworthiness could adversely affect the value of the instrument or derivative. The potential loss on a short exposure is unlimited because the loss increases as the price of the instrument sold short increases.

U.S. Government Securities and Obligations    U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

PERFORMANCE INFORMATION

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Because Class W shares did not have a full calendar year of operations as of December 31, 2011, no performance information for Class W shares is provided below.

Calendar Year Total Returns Class A
(as of December 31 of each year)

Best quarter: 2nd, 2009, 11.81% and Worst quarter: 4th, 2008, (13.66)%
The Fund's Class A shares' year-to-date total return as of June 30, 2012: 5.37%

Average Annual Total Returns%
(for the periods ended December 31, 2011)

Average Annual Total Returns ING Capital Allocation Fund		1 Yr	5 Yrs		10 Yrs		since inception		Inception Date
Class A		(7.64%)	(0.32%)		2.34%				Jan. 20, 1997
Class A After tax on distributions		(8.41%)	(1.70%)		1.26%
Class A After tax on distributions with sale		(4.78%)	(0.98%)		1.48%
Class A S&P Target Risk Growth Index	[1]	1.30%		[2]		[2]
Class A BCAB Index	[1]	7.84%	6.50%		5.78%
Class A MSCI EAFE Index	[3]	(12.14%)	(4.72%)		4.67%
Class A Russell 3000 Index	[1]	1.03%	(0.01%)		3.51%
Class B		(7.49%)	(0.22%)		2.19%				Mar. 01, 1999
Class B S&P Target Risk Growth Index	[1]	1.30%		[2]		[2]
Class B BCAB Index	[1]	7.84%	6.50%		5.78%
Class B MSCI EAFE Index	[3]	(12.14%)	(4.72%)		4.67%
Class B Russell 3000 Index	[1]	1.03%	(0.01%)		3.51%
Class C		(3.63%)	0.14%		2.19%				Jun. 30, 1998
Class C S&P Target Risk Growth Index	[1]	1.30%		[2]		[2]
Class C BCAB Index	[1]	7.84%	6.50%		5.78%
Class C MSCI EAFE Index	[3]	(12.14%)	(4.72%)		4.67%
Class C Russell 3000 Index	[1]	1.03%	(0.01%)		3.51%
Class I		(1.67%)	1.15%		3.22%				Jan. 04, 1995
Class I S&P Target Risk Growth Index	[1]	1.30%		[2]		[2]
Class I BCAB Index	[1]	7.84%	6.50%		5.78%
Class I MSCI EAFE Index	[3]	(12.14%)	(4.72%)		4.67%
Class I Russell 3000 Index	[1]	1.03%	(0.01%)		3.51%
Class O		(1.98%)	0.90%				1.12%		Nov. 15, 2006
Class O S&P Target Risk Growth Index	[1]	1.30%		[2]				[2]
Class O BCAB Index	[1]	7.84%	6.50%				6.40%	[4]
Class O MSCI EAFE Index	[3]	(12.14%)	(4.72%)				(3.45%)	[4]
Class O Russell 3000 Index	[1]	1.03%	(0.01%)				0.64%	[4]

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] Based on Class A shares' expenses adjusted for class specific differences.

[2] Total Annual Fund Operating Expenses shown may be higher than the Fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

[3] The adviser is contractually obligated to limit expenses to 1.15%, 1.90%, 1.90%, 0.90%, 1.15%, and 0.90% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through October 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, and extraordinary expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years.

[1] The index returns do not reflect deductions for fees, expenses or taxes.

[2] The inception date of the S&P Target Risk Growth Index is January 31, 2007.

[3] The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions or other expenses.

[4] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ING SERIES FUND INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2012
ING Core Equity Research Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ING Core Equity Research Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks long-term growth of capital and income.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees Fees paid directly from your investment
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	October 1, 2013
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover % of average value of portfolio
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 71% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	71.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Examples $
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in equity securities of companies that the sub-adviser (“Sub-Adviser”) believes have significant potential for capital appreciation, income growth, or both. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy. The Sub-Adviser may invest principally in common stocks and securities convertible into common stocks having significant potential for capital appreciation, may purchase common stocks principally for their income potential through dividends or may acquire securities having a mix of these characteristics. The Fund may also engage in option writing. The Fund may invest in certain higher risk investments such as derivative instruments, including, but not limited to, put and call options. The Fund typically uses derivatives to seek to reduce exposure to volatility and to substitute for taking a position in the underlying asset. The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). In managing the Fund, the Sub-Adviser: emphasizes stocks of larger companies; looks to opportunistically invest the Fund’s assets in stocks of mid- and small-sized companies and up to 25% of its total assets in stocks of foreign issuers, depending upon market conditions; and utilizes an intensive, fundamentally driven research process to evaluate company financial characteristics (for example, price-to-earnings ratios, growth rates and earnings estimates) to select securities within each class. In analyzing these characteristics, the Sub-Adviser attempts to identify positive earnings momentum and positive valuation characteristics in selecting securities whose perceived value is not reflected in their price. The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others. The Fund may lend portfolio securities on a short-term or long-term basis, up to 331 / 3 % of its total assets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds. Company  The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless. Convertible Securities   Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk. Credit   Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether. Currency  To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns. Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Interest Rate   With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk. Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund. Market    Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth- or value-oriented securities in which the Fund invests. Rather, the market could favor securities to which the Fund is not exposed or may not favor equities at all. Market Capitalization   Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Fund that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns. Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund. Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180. Because Class R shares of the Fund did not have a full calendar year of operations as of December 31, 2011, no performance information for Class R shares is provided below.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-992-0180
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.INGFunds.com/literature
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of future results.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns Class A (as of December 31 of each year)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best quarter: 2nd, 2009, 17.02% and Worst quarter: 4th, 2008, (21.74)% The Fund’s Class A shares’ year-to-date total return as of June 30, 2012: 9.05%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns% (for the periods ended December 31, 2011)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	However, the table includes all applicable fees and sales charges.
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	The index returns do not reflect deductions for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
ING Core Equity Research Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.68%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.26%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.08%
1 Yr	rr_ExpenseExampleYear01	679
3 Yrs	rr_ExpenseExampleYear03	935
5 Yrs	rr_ExpenseExampleYear05	1,211
10 Yrs	rr_ExpenseExampleYear10	1,995
1 Yr	rr_ExpenseExampleNoRedemptionYear01	679
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	935
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,211
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,995
2002	rr_AnnualReturn2002	(25.49%)
2003	rr_AnnualReturn2003	25.47%
2004	rr_AnnualReturn2004	11.49%
2005	rr_AnnualReturn2005	4.13%
2006	rr_AnnualReturn2006	20.57%
2007	rr_AnnualReturn2007	7.93%
2008	rr_AnnualReturn2008	(37.59%)
2009	rr_AnnualReturn2009	27.76%
2010	rr_AnnualReturn2010	12.52%
2011	rr_AnnualReturn2011	(0.40%)
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	9.05%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	17.02%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.74%)
1 Yr	rr_AverageAnnualReturnYear01	(6.13%)
5 Yrs	rr_AverageAnnualReturnYear05	(1.89%)
10 Yrs	rr_AverageAnnualReturnYear10	1.75%
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 15, 1994
ING Core Equity Research Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Management Fees	rr_ManagementFeesOverAssets	0.68%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.01%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.83%
1 Yr	rr_ExpenseExampleYear01	686
3 Yrs	rr_ExpenseExampleYear03	913
5 Yrs	rr_ExpenseExampleYear05	1,266
10 Yrs	rr_ExpenseExampleYear10	2,130
1 Yr	rr_ExpenseExampleNoRedemptionYear01	186
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	613
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,066
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,130
1 Yr	rr_AverageAnnualReturnYear01	(6.09%)
5 Yrs	rr_AverageAnnualReturnYear05	(1.88%)
10 Yrs	rr_AverageAnnualReturnYear10	1.58%
Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 01, 1999
ING Core Equity Research Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.68%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.01%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.83%
1 Yr	rr_ExpenseExampleYear01	286
3 Yrs	rr_ExpenseExampleYear03	613
5 Yrs	rr_ExpenseExampleYear05	1,066
10 Yrs	rr_ExpenseExampleYear10	2,323
1 Yr	rr_ExpenseExampleNoRedemptionYear01	186
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	613
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,066
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,323
1 Yr	rr_AverageAnnualReturnYear01	(2.17%)
5 Yrs	rr_AverageAnnualReturnYear05	(1.50%)
10 Yrs	rr_AverageAnnualReturnYear10	1.57%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1998
ING Core Equity Research Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.68%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.20%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.96%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.21%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.75%
1 Yr	rr_ExpenseExampleYear01	77
3 Yrs	rr_ExpenseExampleYear03	285
5 Yrs	rr_ExpenseExampleYear05	510
10 Yrs	rr_ExpenseExampleYear10	1,159
1 Yr	rr_ExpenseExampleNoRedemptionYear01	77
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	285
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	510
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,159
1 Yr	rr_AverageAnnualReturnYear01	(0.08%)
5 Yrs	rr_AverageAnnualReturnYear05	(0.45%)
10 Yrs	rr_AverageAnnualReturnYear10	2.62%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 03, 1992
ING Core Equity Research Fund | Class O
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.68%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.26%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.08%
1 Yr	rr_ExpenseExampleYear01	110
3 Yrs	rr_ExpenseExampleYear03	382
5 Yrs	rr_ExpenseExampleYear05	674
10 Yrs	rr_ExpenseExampleYear10	1,507
1 Yr	rr_ExpenseExampleNoRedemptionYear01	110
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	382
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	674
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,507
1 Yr	rr_AverageAnnualReturnYear01	(0.47%)
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	14.05%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 06, 2009
ING Core Equity Research Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.68%	[3]
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%	[3]
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%	[3]
Other Expenses	rr_OtherExpensesOverAssets	0.25%	[3]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.51%	[3]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2],[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.33%	[3]
1 Yr	rr_ExpenseExampleYear01	135
3 Yrs	rr_ExpenseExampleYear03	460
5 Yrs	rr_ExpenseExampleYear05	807
10 Yrs	rr_ExpenseExampleYear10	1,786
1 Yr	rr_ExpenseExampleNoRedemptionYear01	135
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	460
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	807
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,786
ING Core Equity Research Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.68%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.01%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.83%
1 Yr	rr_ExpenseExampleYear01	85
3 Yrs	rr_ExpenseExampleYear03	304
5 Yrs	rr_ExpenseExampleYear05	540
10 Yrs	rr_ExpenseExampleYear10	1,220
1 Yr	rr_ExpenseExampleNoRedemptionYear01	85
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	304
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	540
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,220
1 Yr	rr_AverageAnnualReturnYear01	(0.21%)
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	11.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 12, 2009
ING Core Equity Research Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(6.24%)
5 Yrs	rr_AverageAnnualReturnYear05	(2.34%)
10 Yrs	rr_AverageAnnualReturnYear10	1.58%
ING Core Equity Research Fund | After tax on distributions with sale | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(3.84%)
5 Yrs	rr_AverageAnnualReturnYear05	(1.88%)
10 Yrs	rr_AverageAnnualReturnYear10	1.46%
ING Core Equity Research Fund | S&P 500 Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05	(0.25%)	[4]
10 Yrs	rr_AverageAnnualReturnYear10	2.92%	[4]
ING Core Equity Research Fund | S&P 500 Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05	(0.25%)	[4]
10 Yrs	rr_AverageAnnualReturnYear10	2.92%	[4]
ING Core Equity Research Fund | S&P 500 Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05	(0.25%)	[4]
10 Yrs	rr_AverageAnnualReturnYear10	2.92%	[4]
ING Core Equity Research Fund | S&P 500 Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05	(0.25%)	[4]
10 Yrs	rr_AverageAnnualReturnYear10	2.92%	[4]
ING Core Equity Research Fund | S&P 500 Index | Class O
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	18.05%	[4],[5]
ING Core Equity Research Fund | S&P 500 Index | Class W
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	15.26%	[4],[5]

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[2] The adviser is contractually obligated to limit expenses to 1.08%, 1.83%, 1.83%, 0.83%,1.08%, 1.33%, and 0.83% for Class A, Class B, Class C, Class I, Class O, Class R and Class W shares, respectively, through October 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 0.75% for Class I shares through October 1, 2013. There is no guarantee the obligation will continue after October 1, 2013. The obligation will only continue if the adviser elects to renew it and is subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

[3] Based on Class A shares' expenses adjusted for class specific differences.

[4] The index returns do not reflect deductions for fees, expenses or taxes.

[5] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Sep. 28, 2012
Registrant Name	dei_EntityRegistrantName	ING SERIES FUND INC
ING Small Company Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ING Small Company Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks growth of capital primarily through investment in a diversified portfolio of common stock of companies with smaller market capitalizations.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees Fees paid directly from your investment
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	October 1, 2013
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover % of average value of portfolio
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 60% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	60.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	Total Annual Fund Operating Expenses shown may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Examples $
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in common stocks of small-capitalization companies. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy. The sub-adviser (“Sub-Adviser”) defines small-capitalization companies as companies that are included in the Standard & Poor’s SmallCap 600 (“S&P SmallCap 600”) Index or the Russell 2000® Index at the time of purchase, or if not included in either index, have market capitalizations that fall within the range of the market capitalizations of companies included in the S&P SmallCap 600 Index or the Russell 2000® Index. The market capitalization range is reset monthly and will change with market conditions as the range of the companies in the S&P SmallCap 600 Index and Russell 2000® Index change. As of June 29, 2012, the smallest company in the S&P SmallCap 600 Index had a market capitalization of $39.1 million and the largest company had a market capitalization of $3.3 billion. As of June 29, 2012, the smallest company in the Russell 2000® Index had a market capitalization of $53.3 million and the largest company had a market capitalization of $3.8 billion. The Fund may invest in derivative instruments including, but not limited to, put and call options. The Fund typically uses derivative instruments to seek to reduce exposure to other risks, such as currency risk, to substitute for taking a position in the underlying asset, and/or to seek to enhance returns in the Fund. The Fund may also invest, to a limited extent, in foreign stocks. The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). In managing the Fund, the Sub-Adviser invests in stocks that it believes have the potential for long-term growth, as well as those that appear to be trading below their perceived value. The Sub-Adviser uses internally developed quantitative computer models to evaluate financial and fundamental characteristics ( e.g. , changes in earnings, return on equity, and price to equity multiples) of over 2,000 companies. The Sub-Adviser analyzes these characteristics in an attempt to identify companies whose perceived value is not reflected in the stock price; considers the potential of each company to create or take advantage of unique product opportunities, its potential to achieve long-term sustainable growth, and the quality of its management. The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others. The Fund may lend portfolio securities on a short-term or long-term basis, up to 331 / 3 % of its total assets. Fund Closure: Effective February 1, 2011, the Fund was closed to new shareholders, except for shares purchased by: (1) shareholders participating in wrap fee programs offered by broker-dealers and financial institutions; (2) certain institutional and separately managed account investors that are pre-existing clients of the Sub-Adviser; (3) employees of the Adviser or Sub-Adviser and their affiliates; or (4) registered investment companies. Investments by currently invested separate accounts, qualified retirement plans (such as 401(a), 401(k), or other defined contribution plans and defined benefit plans), 529 plans, custodial accounts, and investment companies may be made on behalf of existing and future participants. The closure does not affect share purchases throught he reinvestment of dividends and distributions.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds. Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless. Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns. Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors. Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund. Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth- or value-oriented securities in which the Fund invests. Rather, the market could favor securities to which the Fund is not exposed or may not favor equities at all. Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund. Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner. Small-Capitalization Company    Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-992-0180
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.INGFunds.com/literature
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of future results.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns Class A (as of December 31 of each year)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best quarter: 2nd, 2003, 20.12% and Worst quarter: 4th, 2008, (23.86)% The Fund’s Class A shares’ year-to-date total return as of June 30, 2012: 7.99%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns% (for the periods ended December 31, 2011)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	However, the table includes all applicable fees and sales charges.
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	The index returns do not reflect deductions for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
ING Small Company Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.83%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.32%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.49%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.49%
1 Yr	rr_ExpenseExampleYear01	718
3 Yrs	rr_ExpenseExampleYear03	1,019
5 Yrs	rr_ExpenseExampleYear05	1,341
10 Yrs	rr_ExpenseExampleYear10	2,252
1 Yr	rr_ExpenseExampleNoRedemptionYear01	718
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	1,019
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,341
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,252
2002	rr_AnnualReturn2002	(23.95%)
2003	rr_AnnualReturn2003	39.34%
2004	rr_AnnualReturn2004	13.72%
2005	rr_AnnualReturn2005	8.90%
2006	rr_AnnualReturn2006	16.33%
2007	rr_AnnualReturn2007	4.96%
2008	rr_AnnualReturn2008	(31.41%)
2009	rr_AnnualReturn2009	27.10%
2010	rr_AnnualReturn2010	23.58%
2011	rr_AnnualReturn2011	(3.22%)
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	7.99%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.86%)
1 Yr	rr_AverageAnnualReturnYear01	(8.75%)
5 Yrs	rr_AverageAnnualReturnYear05	0.62%
10 Yrs	rr_AverageAnnualReturnYear10	4.64%
since inception	rr_AverageAnnualReturnSinceInception
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 15, 1994
ING Small Company Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Management Fees	rr_ManagementFeesOverAssets	0.83%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.32%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.24%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	2.24%
1 Yr	rr_ExpenseExampleYear01	727
3 Yrs	rr_ExpenseExampleYear03	1,000
5 Yrs	rr_ExpenseExampleYear05	1,400
10 Yrs	rr_ExpenseExampleYear10	2,386
1 Yr	rr_ExpenseExampleNoRedemptionYear01	227
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	700
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,200
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,386
1 Yr	rr_AverageAnnualReturnYear01	(8.48%)
5 Yrs	rr_AverageAnnualReturnYear05	0.78%
10 Yrs	rr_AverageAnnualReturnYear10	4.48%
since inception	rr_AverageAnnualReturnSinceInception
Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 01, 1999
ING Small Company Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.83%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.32%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.24%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	2.24%
1 Yr	rr_ExpenseExampleYear01	327
3 Yrs	rr_ExpenseExampleYear03	700
5 Yrs	rr_ExpenseExampleYear05	1,200
10 Yrs	rr_ExpenseExampleYear10	2,575
1 Yr	rr_ExpenseExampleNoRedemptionYear01	227
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	700
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,200
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,575
1 Yr	rr_AverageAnnualReturnYear01	(4.90%)
5 Yrs	rr_AverageAnnualReturnYear05	1.07%
10 Yrs	rr_AverageAnnualReturnYear10	4.47%
since inception	rr_AverageAnnualReturnSinceInception
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1998
ING Small Company Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.83%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.28%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.20%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.15%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.05%
1 Yr	rr_ExpenseExampleYear01	107
3 Yrs	rr_ExpenseExampleYear03	366
5 Yrs	rr_ExpenseExampleYear05	645
10 Yrs	rr_ExpenseExampleYear10	1,441
1 Yr	rr_ExpenseExampleNoRedemptionYear01	107
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	366
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	645
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,441
1 Yr	rr_AverageAnnualReturnYear01	(2.81%)
5 Yrs	rr_AverageAnnualReturnYear05	2.12%
10 Yrs	rr_AverageAnnualReturnYear10	5.55%
since inception	rr_AverageAnnualReturnSinceInception
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 04, 1994
ING Small Company Fund | Class O
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.83%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.32%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.49%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.49%
1 Yr	rr_ExpenseExampleYear01	152
3 Yrs	rr_ExpenseExampleYear03	471
5 Yrs	rr_ExpenseExampleYear05	813
10 Yrs	rr_ExpenseExampleYear10	1,779
1 Yr	rr_ExpenseExampleNoRedemptionYear01	152
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	471
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	813
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,779
1 Yr	rr_AverageAnnualReturnYear01	(3.22%)
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	1.20%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 04, 2008
ING Small Company Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.83%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.32%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.24%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.24%
1 Yr	rr_ExpenseExampleYear01	126
3 Yrs	rr_ExpenseExampleYear03	393
5 Yrs	rr_ExpenseExampleYear05	681
10 Yrs	rr_ExpenseExampleYear10	1,500
1 Yr	rr_ExpenseExampleNoRedemptionYear01	126
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	393
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	681
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,500
1 Yr	rr_AverageAnnualReturnYear01	(3.01%)
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	15.71%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 12, 2009
ING Small Company Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(9.53%)
5 Yrs	rr_AverageAnnualReturnYear05	(0.45%)
10 Yrs	rr_AverageAnnualReturnYear10	3.64%
since inception	rr_AverageAnnualReturnSinceInception
ING Small Company Fund | After tax on distributions with sale | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.75%)
5 Yrs	rr_AverageAnnualReturnYear05	0.35%
10 Yrs	rr_AverageAnnualReturnYear10	3.89%
since inception	rr_AverageAnnualReturnSinceInception
ING Small Company Fund | Russell 2000 Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.18%)	[4]
5 Yrs	rr_AverageAnnualReturnYear05	0.15%	[4]
10 Yrs	rr_AverageAnnualReturnYear10	5.62%	[4]
since inception	rr_AverageAnnualReturnSinceInception		[4]
ING Small Company Fund | Russell 2000 Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.18%)	[4]
5 Yrs	rr_AverageAnnualReturnYear05	0.15%	[4]
10 Yrs	rr_AverageAnnualReturnYear10	5.62%	[4]
since inception	rr_AverageAnnualReturnSinceInception		[4]
ING Small Company Fund | Russell 2000 Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.18%)	[4]
5 Yrs	rr_AverageAnnualReturnYear05	0.15%	[4]
10 Yrs	rr_AverageAnnualReturnYear10	5.62%	[4]
since inception	rr_AverageAnnualReturnSinceInception		[4]
ING Small Company Fund | Russell 2000 Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.18%)	[4]
5 Yrs	rr_AverageAnnualReturnYear05	0.15%	[4]
10 Yrs	rr_AverageAnnualReturnYear10	5.62%	[4]
since inception	rr_AverageAnnualReturnSinceInception		[4]
ING Small Company Fund | Russell 2000 Index | Class O
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.18%)	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	1.17%	[4],[5]
ING Small Company Fund | Russell 2000 Index | Class W
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.18%)	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	17.84%	[4],[5]

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[2] Total Annual Fund Operating Expenses shown may be higher than the Fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

[3] The adviser is contractually obligated to limit expenses to 1.50%, 2.25%, 2.25%, 1.25%, 1.50%, and 1.25% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through October 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 1.04% for Class I shares through October 1, 2013. There is no guarantee the obligation will continue after October 1, 2013. The obligation will only continue if the adviser elects to renew it and is subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

[4] The index returns do not reflect deductions for fees, expenses or taxes.

[5] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

ING SMID Cap Equity Fund

ING SMID Cap Equity Fund (formerly, ING Index Plus MidCap Fund)

INVESTMENT OBJECTIVE

The Fund seeks capital growth.

FEES AND EXPENSES OF THE FUND

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).

Shareholder Fees
Fees paid directly from your investment

Prior to November 15, 2012

Shareholder Fees ING SMID Cap Equity Fund	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
Class A	3.00%	none	[1]
Class B	none	5.00%
Class C	none	0.75%
Class I	none	none
Class O	none	none
Class R	none	none
Class W	none	none

Effective November 15, 2012

Shareholder Fees ING SMID Cap Equity Fund

Maximum sales charge (load) as a % of offering price

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

Class A

5.75%

none

^[1]

Class B

none

5.00%

Class C

none

1.00%

Class I

none

none

Class O

none

none

Class R

none

none

Class W

none

none

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Annual Fund Operating Expenses ING SMID Cap Equity Fund		Class A	Class B	Class C	Class I	Class O	Class R	Class W
Management Fees	[1]	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%
Distribution and/or Services (12b-1) Fees	[1]	0.25%	1.00%	0.75%	none	0.25%	0.50%	none
Administrative Services Fees	[1]	0.10%	0.10%	0.10%	0.10%	0.10%	0.10%	0.10%
Other Expenses	[1]	0.38%	0.38%	0.38%	0.36%	0.38%	0.38%	0.38%
Total Annual Fund Operating Expenses	[1]	1.18%	1.93%	1.68%	0.91%	1.18%	1.43%	0.93%
Waivers and Reimbursements	[1][2]	(0.19%)	(0.19%)	(0.19%)	(0.17%)	(0.19%)	(0.19%)	(0.19%)
Total Annual Fund Operating Expenses after Waivers and Reimbursements	[1]	0.99%	1.74%	1.49%	0.74%	0.99%	1.24%	0.74%

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Prior to November 15, 2012

Expense Example ING SMID Cap Equity Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	398	645	912	1,672
Class B	677	888	1,224	2,043
Class C	227	511	895	1,971
Class I	76	273	487	1,104
Class O	101	356	631	1,415
Class R	126	434	764	1,697
Class W	76	277	496	1,126

Prior to November 15, 2012

Expense Example, No Redemption ING SMID Cap Equity Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	398	645	912	1,672
Class B	177	588	1,024	2,043
Class C	152	511	895	1,971
Class I	76	273	487	1,104
Class O	101	356	631	1,415
Class R	126	434	764	1,697
Class W	76	277	496	1,126

Effective November 15, 2012

Expense Example ING SMID Cap Equity Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	670	910	1,169	1,909
Class B	677	888	1,224	2,043
Class C	252	511	895	1,971
Class I	76	273	487	1,104
Class O	101	356	631	1,415
Class R	126	434	764	1,697
Class W	76	277	496	1,126

Effective November 15, 2012

Expense Example, No Redemption ING SMID Cap Equity Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	670	910	1,169	1,909
Class B	177	588	1,024	2,043
Class C	152	511	895	1,971
Class I	76	273	487	1,104
Class O	101	356	631	1,415
Class R	126	434	764	1,697
Class W	76	277	496	1,126

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.

During the most recent fiscal year, the Fund’s portfolio turnover rate was 97% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in securities of of small- and mid-capitalization companies. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Sub-Adviser will generally consider small- to mid-capitalized companies to be companies that, at the time of purchase, have total market capitalizations within the range of market capitalizations of companies in the Russell 2500^TM Index. As of June 29, 2012, the smallest company in the Russell 2500 Index had a market capitalization of $53.3 million and the largest company had a market capitalization of $7.3 billion.

The Fund may invest in derivative instruments, including, but not limited to, put and call options. The Fund typically uses derivatives to seek to reduce exposure to other risks, such as currency risk; to substitute for taking a position in the underlying assets; or to seek to enhance returns in the Fund. The Fund may also invest, to a limited extent, in foreign securities.

The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

In managing the Fund, the Sub-Adviser invests in stocks that it believes have a potential for long-term growth, as well as those that appear to be trading below their perceived value. The Sub-Adviser uses fundamental research capabilities, as well as, proprietary quantitative computer models to evaluate financial and fundamental characteristics (for example, changes in earnings, return on equity, and price to equity multiples) of over 2,000 companies. The Sub-Adviser analyzes these characteristics in an attempt to identify companies whose perceived value is not reflected in the stock price and considers the potential of each company to create or take advantage of unique product opportunities, along with its potential to achieve long-term sustainable growth and the quality of its management.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹ / ₃ % of its total assets.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.

Company   The price of a given company's stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.

Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments.

Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods.

Mid-Capitalization Company   Investments in mid-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of smaller size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. Consequently, the securities of smaller companies may have limited market stability and may be subject to more abrupt or erratic market movements than securities of larger, more established growth companies or the market averages in general.

Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.

Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company    Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

PERFORMANCE INFORMATION

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Because Class W shares of the Fund did not have a full calendar year of operations as of December 31, 2011, no performance information for Class W shares is provided below.

Calendar Year Total Returns Class A
(as of December 31 of each year)

Best quarter: 3rd, 2009, 19.11% and Worst quarter: 4th, 2008, (24.81)%
The Fund's Class A shares' year-to-date total return as of June 30, 2012: 7.64%

Average Annual Total Returns%
(for the periods ended December 31, 2011)

Average Annual Total Returns ING SMID Cap Equity Fund		1 Yr	5 Yrs	10 Yrs	since inception		Inception Date
Class A		(4.63%)	(0.24%)	4.73%			Feb. 03, 1998
Class A After tax on distributions		(4.68%)	(0.91%)	4.12%
Class A After tax on distributions with sale		(2.95%)	(0.25%)	4.05%
Class A Russell 2500TM Index	[1][2]	(2.51%)	1.24%	6.57%
Class A S&P MidCap 400 Index	[1][2]	(1.73%)	3.32%	7.04%
Class B		(7.22%)	(0.72%)	4.26%			Mar. 01, 1999
Class B Russell 2500TM Index	[1][2]	(2.51%)	1.24%	6.57%
Class B S&P MidCap 400 Index	[1][2]	(1.73%)	3.32%	7.04%
Class C		(2.90%)	(0.16%)	4.52%			Jun. 30, 1998
Class C Russell 2500TM Index	[1][2]	(2.51%)	1.24%	6.57%
Class C S&P MidCap 400 Index	[1][2]	(1.73%)	3.32%	7.04%
Class I		(1.34%)	0.64%	5.32%			Feb. 03, 1998
Class I Russell 2500TM Index	[1][2]	(2.51%)	1.24%	6.57%
Class I S&P MidCap 400 Index	[1][2]	(1.73%)	3.32%	7.04%
Class O		(1.65%)	0.36%	5.05%			Aug. 01, 2001
Class O Russell 2500TM Index	[1][2]	(2.51%)	1.24%	6.57%
Class O S&P MidCap 400 Index	[1][2]	(1.73%)	3.32%	7.04%
Class R		(1.89%)	0.11%		5.13%		Oct. 24, 2003
Class R Russell 2500TM Index	[1][2]	(2.51%)	1.24%		6.53%	[3]
Class R S&P MidCap 400 Index	[1][2]	(1.73%)	3.32%		7.40%	[3]

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] Expense ratios have been adjusted to reflect current contractual rates.

[2] The adviser is contractually obligated to limit expenses to 1.00%, 1.75%, 1.50%, 0.75%, 1.00%, 1.25%, and 0.75% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares respectively, through October 1, 2013. In addition, effective July 21, 2012 the adviser is obligated to further limit expenses to 0.99%, 1.74%, 1.49%, 0.74%, 0.99%, 1.24%, and 0.74% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares respectively, though October 1, 2013. These obligations will automatically renew for one-year terms unless they are terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and are subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

[1] The index returns do not reflect deductions for fees, expenses or taxes.

[2] On July 21, 2012, the Fund changed its primary benchmark index from the S&P MidCap 400 Index to the Russell 2500TM Index because the Russell 2500TM Index is considered by the Adviser to be a more appropriate benchmark index reflecting the type of securities in which the Fund now invests.

[3] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

ING SERIES FUND INC

Prospectus Date

rr_ProspectusDate

Sep. 28, 2012

ING SMID Cap Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ING SMID Cap Equity Fund (formerly, ING Index Plus MidCap Fund)

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
Fees paid directly from your investment

Prior to November 15, 2012

Shareholder Fees Caption [Text]

ingsf3_ShareholderFeesCaptionOne

Effective November 15, 2012

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

October 1, 2013

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover % of average value of portfolio

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.

During the most recent fiscal year, the Fund’s portfolio turnover rate was 97% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

97.00%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

Expense ratios have been adjusted to reflect current contractual rates.

Expense Example [Heading]

rr_ExpenseExampleHeading

Expense Examples $

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Prior to November 15, 2012

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Prior to November 15, 2012

Expense Example With Redemption By Year Caption

ingsf3_ExpenseExampleWithRedemptionByYearCaption

Effective November 15, 2012

Expense Example No Redemption By Year Caption

ingsf3_ExpenseExampleNoRedemptionByYearCaptionOne

Effective November 15, 2012

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Strategy [Heading]

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in securities of of small- and mid-capitalization companies. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Sub-Adviser will generally consider small- to mid-capitalized companies to be companies that, at the time of purchase, have total market capitalizations within the range of market capitalizations of companies in the Russell 2500^TM Index. As of June 29, 2012, the smallest company in the Russell 2500 Index had a market capitalization of $53.3 million and the largest company had a market capitalization of $7.3 billion.

The Fund may invest in derivative instruments, including, but not limited to, put and call options. The Fund typically uses derivatives to seek to reduce exposure to other risks, such as currency risk; to substitute for taking a position in the underlying assets; or to seek to enhance returns in the Fund. The Fund may also invest, to a limited extent, in foreign securities.

The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

In managing the Fund, the Sub-Adviser invests in stocks that it believes have a potential for long-term growth, as well as those that appear to be trading below their perceived value. The Sub-Adviser uses fundamental research capabilities, as well as, proprietary quantitative computer models to evaluate financial and fundamental characteristics (for example, changes in earnings, return on equity, and price to equity multiples) of over 2,000 companies. The Sub-Adviser analyzes these characteristics in an attempt to identify companies whose perceived value is not reflected in the stock price and considers the potential of each company to create or take advantage of unique product opportunities, along with its potential to achieve long-term sustainable growth and the quality of its management.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹ / ₃ % of its total assets.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.

Company   The price of a given company's stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.

Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments.

Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods.

Mid-Capitalization Company   Investments in mid-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of smaller size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. Consequently, the securities of smaller companies may have limited market stability and may be subject to more abrupt or erratic market movements than securities of larger, more established growth companies or the market averages in general.

Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.

Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company    Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money on an investment in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Because Class W shares of the Fund did not have a full calendar year of operations as of December 31, 2011, no performance information for Class W shares is provided below.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-800-992-0180

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.INGFunds.com/literature

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is no guarantee of future results.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns Class A
(as of December 31 of each year)

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best quarter: 3rd, 2009, 19.11% and Worst quarter: 4th, 2008, (24.81)%
The Fund's Class A shares' year-to-date total return as of June 30, 2012: 7.64%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns%
(for the periods ended December 31, 2011)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

However, the table includes all applicable fees and sales charges.

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

The index returns do not reflect deductions for fees, expenses or taxes.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

ING SMID Cap Equity Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.00%

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

^[1]

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

5.75%

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

none

^[1]

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.38%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.18%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

0.99%

^[2]

1 Yr

rr_ExpenseExampleYear01

398

3 Yrs

rr_ExpenseExampleYear03

645

5 Yrs

rr_ExpenseExampleYear05

912

10 Yrs

rr_ExpenseExampleYear10

1,672

1 Yr

rr_ExpenseExampleNoRedemptionYear01

398

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

645

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

912

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

1,672

1 Yr

ingsf3_OneYearWithRedemption

670

3 Yrs

ingsf3_ThreeYearWithRedemption

910

5 Yrs

ingsf3_FiveYearsWithRedemption

1,169

10 Yrs

ingsf3_TenYearWithRedemption

1,909

1 Yr

ingsf3_OneYearsNoRedemption

670

3 Yrs

ingsf3_ThreeYearsNoRedemption

910

5 Yrs

ingsf3_FiveYearsNoRedemption

1,169

10 Yrs

ingsf3_TenYearsNoRedemption

1,909

2002

rr_AnnualReturn2002

(12.63%)

2003

rr_AnnualReturn2003

31.58%

2004

rr_AnnualReturn2004

16.09%

2005

rr_AnnualReturn2005

10.67%

2006

rr_AnnualReturn2006

8.84%

2007

rr_AnnualReturn2007

4.89%

2008

rr_AnnualReturn2008

(37.88%)

2009

rr_AnnualReturn2009

31.10%

2010

rr_AnnualReturn2010

21.28%

2011

rr_AnnualReturn2011

(1.67%)

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date total return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.64%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.11%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.81%)

1 Yr

rr_AverageAnnualReturnYear01

(4.63%)

5 Yrs

rr_AverageAnnualReturnYear05

(0.24%)

10 Yrs

rr_AverageAnnualReturnYear10

4.73%

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 03, 1998

ING SMID Cap Equity Fund | Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

5.00%

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.38%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.93%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

1.74%

^[2]

1 Yr

rr_ExpenseExampleYear01

677

3 Yrs

rr_ExpenseExampleYear03

888

5 Yrs

rr_ExpenseExampleYear05

1,224

10 Yrs

rr_ExpenseExampleYear10

2,043

1 Yr

rr_ExpenseExampleNoRedemptionYear01

177

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

588

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

1,024

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

2,043

1 Yr

ingsf3_OneYearWithRedemption

677

3 Yrs

ingsf3_ThreeYearWithRedemption

888

5 Yrs

ingsf3_FiveYearsWithRedemption

1,224

10 Yrs

ingsf3_TenYearWithRedemption

2,043

1 Yr

ingsf3_OneYearsNoRedemption

177

3 Yrs

ingsf3_ThreeYearsNoRedemption

588

5 Yrs

ingsf3_FiveYearsNoRedemption

1,024

10 Yrs

ingsf3_TenYearsNoRedemption

2,043

1 Yr

rr_AverageAnnualReturnYear01

(7.22%)

5 Yrs

rr_AverageAnnualReturnYear05

(0.72%)

10 Yrs

rr_AverageAnnualReturnYear10

4.26%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 1999

ING SMID Cap Equity Fund | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

0.75%

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.75%

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.38%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.68%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

1.49%

^[2]

1 Yr

rr_ExpenseExampleYear01

227

3 Yrs

rr_ExpenseExampleYear03

511

5 Yrs

rr_ExpenseExampleYear05

895

10 Yrs

rr_ExpenseExampleYear10

1,971

1 Yr

rr_ExpenseExampleNoRedemptionYear01

152

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

511

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

895

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

1,971

1 Yr

ingsf3_OneYearWithRedemption

252

3 Yrs

ingsf3_ThreeYearWithRedemption

511

5 Yrs

ingsf3_FiveYearsWithRedemption

895

10 Yrs

ingsf3_TenYearWithRedemption

1,971

1 Yr

ingsf3_OneYearsNoRedemption

152

3 Yrs

ingsf3_ThreeYearsNoRedemption

511

5 Yrs

ingsf3_FiveYearsNoRedemption

895

10 Yrs

ingsf3_TenYearsNoRedemption

1,971

1 Yr

rr_AverageAnnualReturnYear01

(2.90%)

5 Yrs

rr_AverageAnnualReturnYear05

(0.16%)

10 Yrs

rr_AverageAnnualReturnYear10

4.52%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1998

ING SMID Cap Equity Fund | Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

none

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.36%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.91%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

0.74%

^[2]

1 Yr

rr_ExpenseExampleYear01

76

3 Yrs

rr_ExpenseExampleYear03

273

5 Yrs

rr_ExpenseExampleYear05

487

10 Yrs

rr_ExpenseExampleYear10

1,104

1 Yr

rr_ExpenseExampleNoRedemptionYear01

76

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

273

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

487

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

1,104

1 Yr

ingsf3_OneYearWithRedemption

76

3 Yrs

ingsf3_ThreeYearWithRedemption

273

5 Yrs

ingsf3_FiveYearsWithRedemption

487

10 Yrs

ingsf3_TenYearWithRedemption

1,104

1 Yr

ingsf3_OneYearsNoRedemption

76

3 Yrs

ingsf3_ThreeYearsNoRedemption

273

5 Yrs

ingsf3_FiveYearsNoRedemption

487

10 Yrs

ingsf3_TenYearsNoRedemption

1,104

1 Yr

rr_AverageAnnualReturnYear01

(1.34%)

5 Yrs

rr_AverageAnnualReturnYear05

0.64%

10 Yrs

rr_AverageAnnualReturnYear10

5.32%

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 03, 1998

ING SMID Cap Equity Fund | Class O

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

none

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.38%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.18%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

0.99%

^[2]

1 Yr

rr_ExpenseExampleYear01

101

3 Yrs

rr_ExpenseExampleYear03

356

5 Yrs

rr_ExpenseExampleYear05

631

10 Yrs

rr_ExpenseExampleYear10

1,415

1 Yr

rr_ExpenseExampleNoRedemptionYear01

101

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

356

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

631

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

1,415

1 Yr

ingsf3_OneYearWithRedemption

101

3 Yrs

ingsf3_ThreeYearWithRedemption

356

5 Yrs

ingsf3_FiveYearsWithRedemption

631

10 Yrs

ingsf3_TenYearWithRedemption

1,415

1 Yr

ingsf3_OneYearsNoRedemption

101

3 Yrs

ingsf3_ThreeYearsNoRedemption

356

5 Yrs

ingsf3_FiveYearsNoRedemption

631

10 Yrs

ingsf3_TenYearsNoRedemption

1,415

1 Yr

rr_AverageAnnualReturnYear01

(1.65%)

5 Yrs

rr_AverageAnnualReturnYear05

0.36%

10 Yrs

rr_AverageAnnualReturnYear10

5.05%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 01, 2001

ING SMID Cap Equity Fund | Class R

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

none

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.38%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.43%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

1.24%

^[2]

1 Yr

rr_ExpenseExampleYear01

126

3 Yrs

rr_ExpenseExampleYear03

434

5 Yrs

rr_ExpenseExampleYear05

764

10 Yrs

rr_ExpenseExampleYear10

1,697

1 Yr

rr_ExpenseExampleNoRedemptionYear01

126

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

434

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

764

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

1,697

1 Yr

ingsf3_OneYearWithRedemption

126

3 Yrs

ingsf3_ThreeYearWithRedemption

434

5 Yrs

ingsf3_FiveYearsWithRedemption

764

10 Yrs

ingsf3_TenYearWithRedemption

1,697

1 Yr

ingsf3_OneYearsNoRedemption

126

3 Yrs

ingsf3_ThreeYearsNoRedemption

434

5 Yrs

ingsf3_FiveYearsNoRedemption

764

10 Yrs

ingsf3_TenYearsNoRedemption

1,697

1 Yr

rr_AverageAnnualReturnYear01

(1.89%)

5 Yrs

rr_AverageAnnualReturnYear05

0.11%

since inception

rr_AverageAnnualReturnSinceInception

5.13%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 24, 2003

ING SMID Cap Equity Fund | Class W

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) as a % of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum sales charge (load) as a % of offering price

ingsf3_MaximumSalesChargeLoadOfferingPrice

none

Maximum deferred sales charge as a % of purchase or sales price, whichever is less

ingsf3_MaximumDeferredSalesCharge

none

Management Fees

rr_ManagementFeesOverAssets

0.45%

^[2]

Distribution and/or Services (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[2]

Administrative Services Fees

rr_Component1OtherExpensesOverAssets

0.10%

^[2]

Other Expenses

rr_OtherExpensesOverAssets

0.38%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.93%

^[2]

Waivers and Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2],[3]

Total Annual Fund Operating Expenses after Waivers and Reimbursements

rr_NetExpensesOverAssets

0.74%

^[2]

1 Yr

rr_ExpenseExampleYear01

76

3 Yrs

rr_ExpenseExampleYear03

277

5 Yrs

rr_ExpenseExampleYear05

496

10 Yrs

rr_ExpenseExampleYear10

1,126

1 Yr

rr_ExpenseExampleNoRedemptionYear01

76

3 Yrs

rr_ExpenseExampleNoRedemptionYear03

277

5 Yrs

rr_ExpenseExampleNoRedemptionYear05

496

10 Yrs

rr_ExpenseExampleNoRedemptionYear10

1,126

1 Yr

ingsf3_OneYearWithRedemption

76

3 Yrs

ingsf3_ThreeYearWithRedemption

277

5 Yrs

ingsf3_FiveYearsWithRedemption

496

10 Yrs

ingsf3_TenYearWithRedemption

1,126

1 Yr

ingsf3_OneYearsNoRedemption

76

3 Yrs

ingsf3_ThreeYearsNoRedemption

277

5 Yrs

ingsf3_FiveYearsNoRedemption

496

10 Yrs

ingsf3_TenYearsNoRedemption

1,126

ING SMID Cap Equity Fund | After tax on distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(4.68%)

5 Yrs

rr_AverageAnnualReturnYear05

(0.91%)

10 Yrs

rr_AverageAnnualReturnYear10

4.12%

ING SMID Cap Equity Fund | After tax on distributions with sale | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.95%)

5 Yrs

rr_AverageAnnualReturnYear05

(0.25%)

10 Yrs

rr_AverageAnnualReturnYear10

4.05%

ING SMID Cap Equity Fund | Russell 2500TM Index | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.51%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

1.24%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

6.57%

^[4],[5]

ING SMID Cap Equity Fund | Russell 2500TM Index | Class B

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.51%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

1.24%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

6.57%

^[4],[5]

ING SMID Cap Equity Fund | Russell 2500TM Index | Class C

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.51%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

1.24%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

6.57%

^[4],[5]

ING SMID Cap Equity Fund | Russell 2500TM Index | Class I

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.51%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

1.24%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

6.57%

^[4],[5]

ING SMID Cap Equity Fund | Russell 2500TM Index | Class O

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.51%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

1.24%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

6.57%

^[4],[5]

ING SMID Cap Equity Fund | Russell 2500TM Index | Class R

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(2.51%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

1.24%

^[4],[5]

since inception

rr_AverageAnnualReturnSinceInception

6.53%

^[4],[5],[6]

ING SMID Cap Equity Fund | S&P MidCap 400 Index | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(1.73%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

3.32%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

7.04%

^[4],[5]

ING SMID Cap Equity Fund | S&P MidCap 400 Index | Class B

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(1.73%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

3.32%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

7.04%

^[4],[5]

ING SMID Cap Equity Fund | S&P MidCap 400 Index | Class C

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(1.73%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

3.32%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

7.04%

^[4],[5]

ING SMID Cap Equity Fund | S&P MidCap 400 Index | Class I

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(1.73%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

3.32%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

7.04%

^[4],[5]

ING SMID Cap Equity Fund | S&P MidCap 400 Index | Class O

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(1.73%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

3.32%

^[4],[5]

10 Yrs

rr_AverageAnnualReturnYear10

7.04%

^[4],[5]

ING SMID Cap Equity Fund | S&P MidCap 400 Index | Class R

Risk/Return:

rr_RiskReturnAbstract

1 Yr

rr_AverageAnnualReturnYear01

(1.73%)

^[4],[5]

5 Yrs

rr_AverageAnnualReturnYear05

3.32%

^[4],[5]

since inception

rr_AverageAnnualReturnSinceInception

7.40%

^[4],[5],[6]

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[2] Expense ratios have been adjusted to reflect current contractual rates.

[3] The adviser is contractually obligated to limit expenses to 1.00%, 1.75%, 1.50%, 0.75%, 1.00%, 1.25%, and 0.75% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares respectively, through October 1, 2013. In addition, effective July 21, 2012 the adviser is obligated to further limit expenses to 0.99%, 1.74%, 1.49%, 0.74%, 0.99%, 1.24%, and 0.74% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares respectively, though October 1, 2013. These obligations will automatically renew for one-year terms unless they are terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and are subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

[4] The index returns do not reflect deductions for fees, expenses or taxes.

[5] On July 21, 2012, the Fund changed its primary benchmark index from the S&P MidCap 400 Index to the Russell 2500TM Index because the Russell 2500TM Index is considered by the Adviser to be a more appropriate benchmark index reflecting the type of securities in which the Fund now invests.

[6] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

ING Core Equity Research Fund

ING Core Equity Research Fund

INVESTMENT OBJECTIVE

The Fund seeks long-term growth of capital and income.

FEES AND EXPENSES OF THE FUND

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).

Shareholder Fees
Fees paid directly from your investment

Shareholder Fees ING Core Equity Research Fund	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
Class A	5.75%	none	[1]
Class B	none	5.00%
Class C	none	1.00%
Class I	none	none
Class O	none	none
Class R	none	none
Class W	none	none

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Annual Fund Operating Expenses ING Core Equity Research Fund		Class A	Class B	Class C	Class I	Class O	Class R		Class W
Management Fees		0.68%	0.68%	0.68%	0.68%	0.68%	0.68%	[1]	0.68%
Distribution and/or Shareholder Services (12b-1) Fees		0.25%	1.00%	1.00%	none	0.25%	0.50%	[1]	none
Administrative Services Fees		0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	[1]	0.08%
Other Expenses		0.25%	0.25%	0.25%	0.20%	0.25%	0.25%	[1]	0.25%
Total Annual Fund Operating Expenses		1.26%	2.01%	2.01%	0.96%	1.26%	1.51%	[1]	1.01%
Waivers and Reimbursements	[2]	(0.18%)	(0.18%)	(0.18%)	(0.21%)	(0.18%)	(0.18%)	[1]	(0.18%)
Total Annual Fund Operating Expenses after Waivers and Reimbursements		1.08%	1.83%	1.83%	0.75%	1.08%	1.33%	[1]	0.83%

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example ING Core Equity Research Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	679	935	1,211	1,995
Class B	686	913	1,266	2,130
Class C	286	613	1,066	2,323
Class I	77	285	510	1,159
Class O	110	382	674	1,507
Class R	135	460	807	1,786
Class W	85	304	540	1,220

Expense Example, No Redemption ING Core Equity Research Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	679	935	1,211	1,995
Class B	186	613	1,066	2,130
Class C	186	613	1,066	2,323
Class I	77	285	510	1,159
Class O	110	382	674	1,507
Class R	135	460	807	1,786
Class W	85	304	540	1,220

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.

During the most recent fiscal year, the Fund’s portfolio turnover rate was 71% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in equity securities of companies that the sub-adviser (“Sub-Adviser”) believes have significant potential for capital appreciation, income growth, or both. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.

The Sub-Adviser may invest principally in common stocks and securities convertible into common stocks having significant potential for capital appreciation, may purchase common stocks principally for their income potential through dividends or may acquire securities having a mix of these characteristics. The Fund may also engage in option writing.

The Fund may invest in certain higher risk investments such as derivative instruments, including, but not limited to, put and call options. The Fund typically uses derivatives to seek to reduce exposure to volatility and to substitute for taking a position in the underlying asset.

The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

In managing the Fund, the Sub-Adviser: emphasizes stocks of larger companies; looks to opportunistically invest the Fund’s assets in stocks of mid- and small-sized companies and up to 25% of its total assets in stocks of foreign issuers, depending upon market conditions; and utilizes an intensive, fundamentally driven research process to evaluate company financial characteristics (for example, price-to-earnings ratios, growth rates and earnings estimates) to select securities within each class. In analyzing these characteristics, the Sub-Adviser attempts to identify positive earnings momentum and positive valuation characteristics in selecting securities whose perceived value is not reflected in their price.

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹ / ₃ % of its total assets.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.
Company  The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Convertible Securities   Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.

Credit   Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.

Currency  To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.

Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments.

Interest Rate   With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.

Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market    Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth- or value-oriented securities in which the Fund invests. Rather, the market could favor securities to which the Fund is not exposed or may not favor equities at all.

Market Capitalization   Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Fund that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns.

Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.

Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

PERFORMANCE INFORMATION

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Because Class R shares of the Fund did not have a full calendar year of operations as of December 31, 2011, no performance information for Class R shares is provided below.

Calendar Year Total Returns Class A
(as of December 31 of each year)

Best quarter: 2nd, 2009, 17.02% and Worst quarter: 4th, 2008, (21.74)%
The Fund’s Class A shares’ year-to-date total return as of June 30, 2012: 9.05%

Average Annual Total Returns%
(for the periods ended December 31, 2011)

Average Annual Total Returns ING Core Equity Research Fund		1 Yr	5 Yrs	10 Yrs	since inception		Inception Date
Class A		(6.13%)	(1.89%)	1.75%			Apr. 15, 1994
Class A After tax on distributions		(6.24%)	(2.34%)	1.58%
Class A After tax on distributions with sale		(3.84%)	(1.88%)	1.46%
Class A S&P 500 Index	[1]	2.11%	(0.25%)	2.92%
Class B		(6.09%)	(1.88%)	1.58%			Mar. 01, 1999
Class B S&P 500 Index	[1]	2.11%	(0.25%)	2.92%
Class C		(2.17%)	(1.50%)	1.57%			Jun. 30, 1998
Class C S&P 500 Index	[1]	2.11%	(0.25%)	2.92%
Class I		(0.08%)	(0.45%)	2.62%			Jan. 03, 1992
Class I S&P 500 Index	[1]	2.11%	(0.25%)	2.92%
Class O		(0.47%)			14.05%		Feb. 06, 2009
Class O S&P 500 Index	[1]	2.11%			18.05%	[2]
Class W		(0.21%)			11.17%		Jun. 12, 2009
Class W S&P 500 Index	[1]	2.11%			15.26%	[2]

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] Based on Class A shares' expenses adjusted for class specific differences.

[2] The adviser is contractually obligated to limit expenses to 1.08%, 1.83%, 1.83%, 0.83%,1.08%, 1.33%, and 0.83% for Class A, Class B, Class C, Class I, Class O, Class R and Class W shares, respectively, through October 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 0.75% for Class I shares through October 1, 2013. There is no guarantee the obligation will continue after October 1, 2013. The obligation will only continue if the adviser elects to renew it and is subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

[1] The index returns do not reflect deductions for fees, expenses or taxes.

[2] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

ING Small Company Fund

ING Small Company Fund

INVESTMENT OBJECTIVE

The Fund seeks growth of capital primarily through investment in a diversified portfolio of common stock of companies with smaller market capitalizations.

FEES AND EXPENSES OF THE FUND

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).

Shareholder Fees
Fees paid directly from your investment

Shareholder Fees ING Small Company Fund	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
Class A	5.75%	none	[1]
Class B	none	5.00%
Class C	none	1.00%
Class I	none	none
Class O	none	none
Class W	none	none

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Annual Fund Operating Expenses ING Small Company Fund		Class A	Class B	Class C	Class I	Class O	Class W
Management Fees		0.83%	0.83%	0.83%	0.83%	0.83%	0.83%
Distribution and/or Shareholder Services (12b-1) Fees		0.25%	1.00%	1.00%	none	0.25%	none
Administrative Services Fees		0.08%	0.08%	0.08%	0.08%	0.08%	0.08%
Other Expenses		0.32%	0.32%	0.32%	0.28%	0.32%	0.32%
Acquired Fund Fees and Expenses		0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	[1]	1.49%	2.24%	2.24%	1.20%	1.49%	1.24%
Waivers and Reimbursements	[2]	none	none	none	(0.15%)	none	none
Total Annual Fund Operating Expenses after Waivers and Reimbursements		1.49%	2.24%	2.24%	1.05%	1.49%	1.24%

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example ING Small Company Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	718	1,019	1,341	2,252
Class B	727	1,000	1,400	2,386
Class C	327	700	1,200	2,575
Class I	107	366	645	1,441
Class O	152	471	813	1,779
Class W	126	393	681	1,500

Expense Example, No Redemption ING Small Company Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	718	1,019	1,341	2,252
Class B	227	700	1,200	2,386
Class C	227	700	1,200	2,575
Class I	107	366	645	1,441
Class O	152	471	813	1,779
Class W	126	393	681	1,500

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.
During the most recent fiscal year, the Fund’s portfolio turnover rate was 60% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in common stocks of small-capitalization companies. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy.
The sub-adviser (“Sub-Adviser”) defines small-capitalization companies as companies that are included in the Standard & Poor’s SmallCap 600 (“S&P SmallCap 600”) Index or the Russell 2000^® Index at the time of purchase, or if not included in either index, have market capitalizations that fall within the range of the market capitalizations of companies included in the S&P SmallCap 600 Index or the Russell 2000^® Index. The market capitalization range is reset monthly and will change with market conditions as the range of the companies in the S&P SmallCap 600 Index and Russell 2000^® Index change. As of June 29, 2012, the smallest company in the S&P SmallCap 600 Index had a market capitalization of $39.1 million and the largest company had a market capitalization of $3.3 billion. As of June 29, 2012, the smallest company in the Russell 2000^® Index had a market capitalization of $53.3 million and the largest company had a market capitalization of $3.8 billion.
The Fund may invest in derivative instruments including, but not limited to, put and call options. The Fund typically uses derivative instruments to seek to reduce exposure to other risks, such as currency risk, to substitute for taking a position in the underlying asset, and/or to seek to enhance returns in the Fund. The Fund may also invest, to a limited extent, in foreign stocks.
The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).
In managing the Fund, the Sub-Adviser invests in stocks that it believes have the potential for long-term growth, as well as those that appear to be trading below their perceived value. The Sub-Adviser uses internally developed quantitative computer models to evaluate financial and fundamental characteristics ( e.g. , changes in earnings, return on equity, and price to equity multiples) of over 2,000 companies. The Sub-Adviser analyzes these characteristics in an attempt to identify companies whose perceived value is not reflected in the stock price; considers the potential of each company to create or take advantage of unique product opportunities, its potential to achieve long-term sustainable growth, and the quality of its management.
The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.
The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹ / ₃ % of its total assets.
Fund Closure: Effective February 1, 2011, the Fund was closed to new shareholders, except for shares purchased by: (1) shareholders participating in wrap fee programs offered by broker-dealers and financial institutions; (2) certain institutional and separately managed account investors that are pre-existing clients of the Sub-Adviser; (3) employees of the Adviser or Sub-Adviser and their affiliates; or (4) registered investment companies. Investments by currently invested separate accounts, qualified retirement plans (such as 401(a), 401(k), or other defined contribution plans and defined benefit plans), 529 plans, custodial accounts, and investment companies may be made on behalf of existing and future participants. The closure does not affect share purchases throught he reinvestment of dividends and distributions.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.

Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.

Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments.

Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth- or value-oriented securities in which the Fund invests. Rather, the market could favor securities to which the Fund is not exposed or may not favor equities at all.

Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.

Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

Small-Capitalization Company    Investments in small-capitalization companies may involve greater risk than is customarily associated with larger, more established companies due to the greater business risks of small size, limited markets and financial resources, narrow product lines and the frequent lack of depth of management. The securities of smaller companies are often traded over-the-counter and may not be traded in volume typical on a national securities exchange.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

PERFORMANCE INFORMATION

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Calendar Year Total Returns Class A
(as of December 31 of each year)

Best quarter: 2nd, 2003, 20.12% and Worst quarter: 4th, 2008, (23.86)%

The Fund’s Class A shares’ year-to-date total return as of June 30, 2012: 7.99%

Average Annual Total Returns%
(for the periods ended December 31, 2011)

Average Annual Total Returns ING Small Company Fund		1 Yr	5 Yrs	10 Yrs	since inception		Inception Date
Class A		(8.75%)	0.62%	4.64%			Apr. 15, 1994
Class A After tax on distributions		(9.53%)	(0.45%)	3.64%
Class A After tax on distributions with sale		(4.75%)	0.35%	3.89%
Class A Russell 2000 Index	[1]	(4.18%)	0.15%	5.62%
Class B		(8.48%)	0.78%	4.48%			Mar. 01, 1999
Class B Russell 2000 Index	[1]	(4.18%)	0.15%	5.62%
Class C		(4.90%)	1.07%	4.47%			Jun. 30, 1998
Class C Russell 2000 Index	[1]	(4.18%)	0.15%	5.62%
Class I		(2.81%)	2.12%	5.55%			Jan. 04, 1994
Class I Russell 2000 Index	[1]	(4.18%)	0.15%	5.62%
Class O		(3.22%)			1.20%		Jun. 04, 2008
Class O Russell 2000 Index	[1]	(4.18%)			1.17%	[2]
Class W		(3.01%)			15.71%		Jun. 12, 2009
Class W Russell 2000 Index	[1]	(4.18%)			17.84%	[2]

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] Total Annual Fund Operating Expenses shown may be higher than the Fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

[2] The adviser is contractually obligated to limit expenses to 1.50%, 2.25%, 2.25%, 1.25%, 1.50%, and 1.25% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through October 1, 2013. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 1.04% for Class I shares through October 1, 2013. There is no guarantee the obligation will continue after October 1, 2013. The obligation will only continue if the adviser elects to renew it and is subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

[1] The index returns do not reflect deductions for fees, expenses or taxes.

[2] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ING SERIES FUND INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2012
ING Corporate Leaders 100 Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ING Corporate Leaders 100 Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to outperform the S&P 500® Index.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees Fees paid directly from your investment
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	October 1, 2013
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover % of average value of portfolio
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 92% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	92.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Examples $
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests primarily in equity securities of issuers listed on the Standard & Poor’s 100 Index (“Index”). The Index, a subset of the S&P 500® Index, is a capitalization-weighted index based on 100 highly capitalized stocks for which options are listed. The Index measures large company U.S. stock market performance. The minimum market capitalization level is reset periodically and will change with market conditions as the market capitalization range of the companies in the Index changes. The market capitalization of companies in the Index as of June 29, 2012 ranged from $17.2 billion to $546.1 billion. Equity securities include, but are not limited to, common and preferred stock, warrants and convertible securities. The Fund also invests in derivatives, including, but not limited to, futures. The Fund typically uses derivatives to substitute for taking a position in the underlying asset. The Fund may also invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). Initially, the Index securities are equally weighted in the Fund’s investment portfolio, meaning that the securities of an Index issuer would represent approximately 1% of the Fund’s investment portfolio. This approach seeks to increase performance potential and tends to overweight undervalued securities. If the value of the securities of a particular company appreciates more than 50% during a given quarter, it would be reduced to 1%. If the value of the securities of a particular company falls more than 30% during a calendar quarter, these securities will be sold. The Fund’s investment portfolio will be rebalanced quarterly to re-align the Fund’s holdings to the 1% weightings. The Fund is not limited to either a “value” or “growth” style but will have a value bias. The sub-adviser (“Sub-Adviser”) may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others. The Fund may lend portfolio securities on a short-term or long-term basis, up to 331 / 3 % of its total assets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds. Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless. Convertible Securities   Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk. Credit   Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether. Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns. Index Strategy   The index selected may underperform the overall market and the Fund might fail to track its target index. The correlation between the Fund and index performance may be affected by the Fund’s expenses and the timing of purchases and redemptions of the Fund’s shares. The Fund’s actual holdings might not match the Index and the Fund’s effective exposure to index securities at any given time may not equal 100%. Interest Rate   With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk. Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund. Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth- or value-oriented securities in which the Fund invests. Rather, the market could favor securities to which the Fund is not exposed or may not favor equities at all. Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund. Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-992-0180
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.INGFunds.com/literature
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of future results.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns Class A (as of December 31 of each year)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best quarter: 2nd, 2009, 20.19% and Worst quarter: 3rd, 2011, (14.73)% The Fund’s Class A shares’ year-to-date total return as of June 30, 2012: 8.56% Because Class O and Class R shares of the Fund had not commenced operations as of December 31, 2011, no performance information for Class O and Class R shares is provided below.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns% (for the periods ended December 31, 2011)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	However, the table includes all applicable fees and sales charges.
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	The index returns do not reflect deductions for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
ING Corporate Leaders 100 Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.85%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.60%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.70%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.90%
1 Yr	rr_ExpenseExampleYear01	662
3 Yrs	rr_ExpenseExampleYear03	986
5 Yrs	rr_ExpenseExampleYear05	1,333
10 Yrs	rr_ExpenseExampleYear10	2,310
1 Yr	rr_ExpenseExampleNoRedemptionYear01	662
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	986
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,333
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,310
Annual Return 2002	rr_AnnualReturn2002
Annual Return 2003	rr_AnnualReturn2003
Annual Return 2004	rr_AnnualReturn2004
Annual Return 2005	rr_AnnualReturn2005
Annual Return 2006	rr_AnnualReturn2006
Annual Return 2007	rr_AnnualReturn2007
Annual Return 2008	rr_AnnualReturn2008
2009	rr_AnnualReturn2009	32.22%
2010	rr_AnnualReturn2010	15.06%
2011	rr_AnnualReturn2011	1.87%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	8.56%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.19%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(14.73%)
1 Yr	rr_AverageAnnualReturnYear01	(3.98%)
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	1.38%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2008
ING Corporate Leaders 100 Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Management Fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.85%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.35%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.70%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.65%
1 Yr	rr_ExpenseExampleYear01	668
3 Yrs	rr_ExpenseExampleYear03	966
5 Yrs	rr_ExpenseExampleYear05	1,392
10 Yrs	rr_ExpenseExampleYear10	2,444
1 Yr	rr_ExpenseExampleNoRedemptionYear01	168
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	666
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,192
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,444
1 Yr	rr_AverageAnnualReturnYear01	(3.90%)
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	1.58%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2008
ING Corporate Leaders 100 Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.85%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.35%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.95%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.40%
1 Yr	rr_ExpenseExampleYear01	243
3 Yrs	rr_ExpenseExampleYear03	642
5 Yrs	rr_ExpenseExampleYear05	1,169
10 Yrs	rr_ExpenseExampleYear10	2,613
1 Yr	rr_ExpenseExampleNoRedemptionYear01	143
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	642
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,169
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,613
1 Yr	rr_AverageAnnualReturnYear01	0.05%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	2.43%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2008
ING Corporate Leaders 100 Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.80%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.30%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.65%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.65%
1 Yr	rr_ExpenseExampleYear01	66
3 Yrs	rr_ExpenseExampleYear03	348
5 Yrs	rr_ExpenseExampleYear05	651
10 Yrs	rr_ExpenseExampleYear10	1,511
1 Yr	rr_ExpenseExampleNoRedemptionYear01	66
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	348
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	651
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,511
1 Yr	rr_AverageAnnualReturnYear01	2.12%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	3.32%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2008
ING Corporate Leaders 100 Fund | Class O
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.40%	[3]
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%	[3]
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%	[3]
Other Expenses	rr_OtherExpensesOverAssets	0.85%	[3]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.60%	[3]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.70%)	[2],[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.90%	[3]
1 Yr	rr_ExpenseExampleYear01	92
3 Yrs	rr_ExpenseExampleYear03	436
5 Yrs	rr_ExpenseExampleYear05	805
10 Yrs	rr_ExpenseExampleYear10	1,841
1 Yr	rr_ExpenseExampleNoRedemptionYear01	92
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	436
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	805
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,841
ING Corporate Leaders 100 Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.40%	[3]
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%	[3]
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%	[3]
Other Expenses	rr_OtherExpensesOverAssets	0.85%	[3]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.85%	[3]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.70%)	[2],[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.15%	[3]
1 Yr	rr_ExpenseExampleYear01	117
3 Yrs	rr_ExpenseExampleYear03	514
5 Yrs	rr_ExpenseExampleYear05	935
10 Yrs	rr_ExpenseExampleYear10	2,112
1 Yr	rr_ExpenseExampleNoRedemptionYear01	117
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	514
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	935
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,112
ING Corporate Leaders 100 Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.85%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.35%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.70%)	[2]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.65%
1 Yr	rr_ExpenseExampleYear01	66
3 Yrs	rr_ExpenseExampleYear03	359
5 Yrs	rr_ExpenseExampleYear05	672
10 Yrs	rr_ExpenseExampleYear10	1,563
1 Yr	rr_ExpenseExampleNoRedemptionYear01	66
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	359
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	672
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,563
1 Yr	rr_AverageAnnualReturnYear01	2.10%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	3.37%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2008
ING Corporate Leaders 100 Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.22%)
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	1.14%
ING Corporate Leaders 100 Fund | After tax on distributions with sale | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(2.29%)
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	1.15%
ING Corporate Leaders 100 Fund | S&P 500 Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	1.75%	[4],[5]
ING Corporate Leaders 100 Fund | S&P 500 Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	1.75%	[4],[5]
ING Corporate Leaders 100 Fund | S&P 500 Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	1.75%	[4],[5]
ING Corporate Leaders 100 Fund | S&P 500 Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	1.75%	[4],[5]
ING Corporate Leaders 100 Fund | S&P 500 Index | Class W
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	2.11%	[4]
5 Yrs	rr_AverageAnnualReturnYear05		[4]
10 Yrs	rr_AverageAnnualReturnYear10		[4]
since inception	rr_AverageAnnualReturnSinceInception	1.75%	[4],[5]

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[2] The adviser is contractually obligated to limit expenses to 0.90%, 1.65%, 1.45%, 0.65%, 0.90%, 1.15%, and 0.65% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through October 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. The Distributor is contractually obligated to waive 0.25% of the distribution fee for Class C shares of the Fund through October 1, 2013. The distribution fee waiver will automatically renew for one-year terms unless it is terminated or modified by the Fund's Board of Directors.

[3] Based on Class A shares' expenses adjusted for class specific differences.

[4] The index returns do not reflect deductions for fees, expenses or taxes.

[5] Reflects index performance since the date closest to the Class' inception for which data is available.

XML

Document and Entity Information	12 Months Ended
	Sep. 28, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	May 31, 2012
Registrant Name	ING SERIES FUND INC
Central Index Key	0000877233
Amendment Flag	false
Document Creation Date	Sep. 27, 2012
Document Effective Date	Sep. 28, 2012
Prospectus Date	Sep. 28, 2012

XML

ING Large Cap Growth Fund

ING Large Cap Growth Fund

INVESTMENT OBJECTIVE

The Fund seeks long-term capital growth.

FEES AND EXPENSES OF THE FUND

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).

Shareholder Fees
Fees paid directly from your investment

Shareholder Fees ING Large Cap Growth Fund	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
Class A	5.75%	none	[1]
Class C	none	1.00%
Class I	none	none
Class R	none	none
Class W	none	none

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Annual Fund Operating Expenses ING Large Cap Growth Fund		Class A	Class C	Class I	Class R	Class W
Management Fees		0.70%	0.70%	0.70%	0.70%	0.70%
Distribution and/or Shareholder Services (12b-1) Fees		0.25%	1.00%	none	0.50%	none
Administrative Services Fees		0.10%	0.10%	0.10%	0.10%	0.10%
Other Expenses	[1]	0.48%	0.48%	0.43%	0.48%	0.48%
Total Annual Fund Operating Expenses		1.53%	2.28%	1.23%	1.78%	1.28%
Waivers and Reimbursements	[2]	(0.38%)	(0.38%)	(0.38%)	(0.38%)	(0.38%)
Total Annual Fund Operating Expenses after Waivers and Reimbursements		1.15%	1.90%	0.85%	1.40%	0.90%

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example ING Large Cap Growth Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	685	958	1,292	2,231
Class C	293	638	1,149	2,555
Class I	87	313	601	1,419
Class R	143	484	891	2,030
Class W	92	329	627	1,476

Expense Example, No Redemption ING Large Cap Growth Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	685	958	1,292	2,231
Class C	193	638	1,149	2,555
Class I	87	313	601	1,419
Class R	143	484	891	2,030
Class W	92	329	627	1,476

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first two years of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.
During the most recent fiscal period, the Fund’s portfolio turnover rate was 22% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in common stocks of large-capitalization companies. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy. The Fund’s investment strategy uses a stock selection process that combines the discipline of quantitative screens with rigorous fundamental security analysis. The quantitative screens focus the fundamental analysis by identifying the stocks of companies with strong business momentum that demonstrate relative price strength, and have a perceived value not reflected in the current price. The objective of the fundamental analysis is to confirm the persistence of the company’s revenue and earnings growth, and validate the expectations for earnings estimate revisions, particularly relative to consensus estimates. A determination of reasonable valuation for individual securities is based on the judgment of the sub-adviser (“Sub-Adviser”). For this Fund, large-capitalization companies are companies with market capitalizations which fall within the range of companies in the Russell 1000^® Growth Index at the time of purchase. The market capitalization of companies within the Russell 1000^® Growth Index will change with market conditions. The market capitalization of companies in the Russell 1000^® Growth Index as of June 29, 2012 ranged from $1.1 billion to $546.1 billion.

The Fund may also invest in derivative instruments, which include, but are not limited to, index futures and options to hedge against market risk or to enhance returns.

The Fund may also invest up to 25% of its assets in foreign securities.

The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).

The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹ / ₃ % of its total assets.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.

Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.

Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.

Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments.

Growth Investing   Prices of growth stocks typically reflect high expectations for future company growth, and may fall quickly and significantly if investors suspect that actual growth may be less than expected. Growth companies typically lack any dividends that might cushion price declines. Growth stocks tend to be more volatile than value stocks, and may underperform the market as a whole over any given time period.

Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors.

Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.

Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods.

Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.

Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

PERFORMANCE INFORMATION

Because the Fund had not commenced operations as of the calendar year ended December 31, 2011, there is no annual performance information included.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] Other Expenses are based on estimated amounts for the current fiscal year.

[2] The adviser is contractually obligated to limit expenses to 1.15%, 1.90%, 0.90%, 1.40%, and 0.90% for Class A, Class C, Class I, Class R, and Class W shares, respectively, through October 1, 2014. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 0.85% for Class I shares through October 1, 2014. There is no guarantee the obligation will continue after October 1, 2014. The obligation will only continue if the adviser elects to renew it and is subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ING SERIES FUND INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2012
ING Large Cap Growth Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ING Large Cap Growth Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks long-term capital growth.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees Fees paid directly from your investment
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	October 1, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover % of average value of portfolio
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance. During the most recent fiscal period, the Fund’s portfolio turnover rate was 22% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	22.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Other Expenses are based on estimated amounts for the current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Examples $
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first two years of the three-, five-, and ten-year periods.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in common stocks of large-capitalization companies. The Fund will provide shareholders with at least 60 days’ prior notice of any change in this investment policy. The Fund’s investment strategy uses a stock selection process that combines the discipline of quantitative screens with rigorous fundamental security analysis. The quantitative screens focus the fundamental analysis by identifying the stocks of companies with strong business momentum that demonstrate relative price strength, and have a perceived value not reflected in the current price. The objective of the fundamental analysis is to confirm the persistence of the company’s revenue and earnings growth, and validate the expectations for earnings estimate revisions, particularly relative to consensus estimates. A determination of reasonable valuation for individual securities is based on the judgment of the sub-adviser (“Sub-Adviser”). For this Fund, large-capitalization companies are companies with market capitalizations which fall within the range of companies in the Russell 1000® Growth Index at the time of purchase. The market capitalization of companies within the Russell 1000® Growth Index will change with market conditions. The market capitalization of companies in the Russell 1000® Growth Index as of June 29, 2012 ranged from $1.1 billion to $546.1 billion. The Fund may also invest in derivative instruments, which include, but are not limited to, index futures and options to hedge against market risk or to enhance returns. The Fund may also invest up to 25% of its assets in foreign securities. The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others. The Fund may lend portfolio securities on a short-term or long-term basis, up to 331 / 3 % of its total assets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds. Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless. Currency   To the extent that the Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns. Foreign Investments   Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Growth Investing   Prices of growth stocks typically reflect high expectations for future company growth, and may fall quickly and significantly if investors suspect that actual growth may be less than expected. Growth companies typically lack any dividends that might cushion price declines. Growth stocks tend to be more volatile than value stocks, and may underperform the market as a whole over any given time period. Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors. Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund. Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund. Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Because the Fund had not commenced operations as of the calendar year ended December 31, 2011, there is no annual performance information included.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Because the Fund had not commenced operations as of the calendar year ended December 31, 2011, there is no annual performance information included.
ING Large Cap Growth Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.48%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.53%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.38%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.15%
1 Yr	rr_ExpenseExampleYear01	685
3 Yrs	rr_ExpenseExampleYear03	958
5 Yrs	rr_ExpenseExampleYear05	1,292
10 Yrs	rr_ExpenseExampleYear10	2,231
1 Yr	rr_ExpenseExampleNoRedemptionYear01	685
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	958
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,292
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,231
ING Large Cap Growth Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.48%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.28%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.38%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.90%
1 Yr	rr_ExpenseExampleYear01	293
3 Yrs	rr_ExpenseExampleYear03	638
5 Yrs	rr_ExpenseExampleYear05	1,149
10 Yrs	rr_ExpenseExampleYear10	2,555
1 Yr	rr_ExpenseExampleNoRedemptionYear01	193
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	638
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,149
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,555
ING Large Cap Growth Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.43%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.23%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.38%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.85%
1 Yr	rr_ExpenseExampleYear01	87
3 Yrs	rr_ExpenseExampleYear03	313
5 Yrs	rr_ExpenseExampleYear05	601
10 Yrs	rr_ExpenseExampleYear10	1,419
1 Yr	rr_ExpenseExampleNoRedemptionYear01	87
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	313
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	601
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,419
ING Large Cap Growth Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.48%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.78%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.38%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.40%
1 Yr	rr_ExpenseExampleYear01	143
3 Yrs	rr_ExpenseExampleYear03	484
5 Yrs	rr_ExpenseExampleYear05	891
10 Yrs	rr_ExpenseExampleYear10	2,030
1 Yr	rr_ExpenseExampleNoRedemptionYear01	143
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	484
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	891
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,030
ING Large Cap Growth Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.48%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.28%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.38%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.90%
1 Yr	rr_ExpenseExampleYear01	92
3 Yrs	rr_ExpenseExampleYear03	329
5 Yrs	rr_ExpenseExampleYear05	627
10 Yrs	rr_ExpenseExampleYear10	1,476
1 Yr	rr_ExpenseExampleNoRedemptionYear01	92
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	329
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	627
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,476

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[2] Other Expenses are based on estimated amounts for the current fiscal year.

[3] The adviser is contractually obligated to limit expenses to 1.15%, 1.90%, 0.90%, 1.40%, and 0.90% for Class A, Class C, Class I, Class R, and Class W shares, respectively, through October 1, 2014. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. In addition, the adviser is contractually obligated to further limit expenses to 0.85% for Class I shares through October 1, 2014. There is no guarantee the obligation will continue after October 1, 2014. The obligation will only continue if the adviser elects to renew it and is subject to possible recoupment by the adviser within three years. These obligations do not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ING SERIES FUND INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2012
Document Creation Date	dei_DocumentCreationDate	Sep. 27, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ING SERIES FUND INC
Prospectus Date	rr_ProspectusDate	Sep. 28, 2012
ING Capital Allocation Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ING Capital Allocation Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide total return consisting of capital growth, both realized and unrealized, and current income.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 40) or the Statement of Additional Information (page 134).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees Fees paid directly from your investment
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	October 1, 2013
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover % of average value of portfolio
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 114% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	114.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	Total Annual Fund Operating Expenses shown may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Examples $
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the sub-adviser (“Sub-Adviser”) invests the assets of the Fund in a combination of Underlying Funds that, in turn, invest directly in securities (such as stocks and bonds). Under normal market conditions, approximately 65% of the Fund’s net assets will be allocated to Underlying Funds that invest in equity securities, and approximately 35% of the Fund’s net assets will be allocated to Underlying Funds that invest in fixed-income securities, including U.S. government securities and money market instruments (“Target Allocations”). The percentage weight of the Fund’s assets invested in Underlying Funds that invest in equity securities may range from 25-80%. The percentage weight of the Fund’s assets invested in Underlying Funds that invest in fixed-income securities may range from 20-50%. The asset allocation limits apply at the time of purchase of a particular security. The Target Allocations are measured with reference to the primary investment strategies of the Underlying Funds; actual exposure to these asset classes will vary from the Target Allocations if an Underlying Fund is not substantially invested in accordance with its primary investment strategies. The Underlying Funds provide exposure to a wide range of traditional asset classes which include stocks, bonds and cash and non-traditional asset classes (also known as alternative strategies) which includes real estate, commodities, and floating rate loans. In addition, the Sub-Adviser may seek to enhance returns and/or moderate volatility through investment strategies such as tactical asset allocation, option strategies, including but not limited to, covered call writing, puts, calls and spreads, and defensive cash positioning. The Fund may also allocate in the future to the following asset class: absolute return strategies. Absolute return strategies are intended to produce returns that may not be correlated or are inversely correlated with equity index performance. There can be no assurance that the allocation will occur. The Sub-Adviser uses a proprietary asset allocation strategy to determine the Target Allocations for the Fund. The Sub-Adviser uses asset allocation models to determine how much to invest in the various asset classes, regions, styles, and strategies. The equity securities in which the Underlying Funds may invest include, but are not limited to: domestic and international stocks of companies of any market capitalization; emerging market securities; domestic and international real estate stocks, including real estate investment trusts (“REITs”); and natural resource/commodity securities. The fixed-income securities in which the Underlying Funds may invest include, but are not limited to: domestic and international short-, intermediate- and long-term bonds; high-yield debt securities rated below investment grade commonly referred to as “junk bonds;” treasury inflation protected securities (“TIPS”); and fixed-income securities without limitations on maturity. The Fund may also invest in derivative instruments including futures, swaps (including interest rate swaps, total return swaps, and credit default swaps), puts, calls and spreads to make tactical allocations, as a substitute for taking a position in the underlying assets, and to assist in managing cash. The Fund may invest in exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). The Fund may also invest in other securities to gain exposure to asset classes, to make tactical asset allocations, to seek to minimize risk, and to assist in managing cash. The Fund may hold up to 25% of its assets in cash and cash equivalents to generate alpha and limit downside in volatile market environments. In addition to other short-term investments, the Fund may invest in affiliated registered and unregistered money market funds to manage the Fund’s cash pending investment in other strategies. The Fund may also employ a strategy (the “Option Strategy”) of writing (selling) call options (each a “Call Option”) on indices, exchange-traded funds, and/or baskets of securities in an attempt to generate gains from option premiums to seek to increase total return and to seek to reduce volatility. Because the performance of the securities underlying each Call Option are expected to correlate closely with the performance of one or more Underlying Funds, during the term of each written Call Option the Fund will be effectively giving up all or a portion of the benefits it would otherwise realize from a potential increase in the value of such Underlying Funds. Thus, the Option Strategy may limit the Fund’s ability to benefit from appreciation of Underlying Funds. At the same time, the premium received in connection with the sale of Call Options may partially offset potential declines in value of the Underlying Funds during periods of declining markets. Additionally, the Fund may employ an options “collar” strategy (the “Collar Strategy”) by purchasing and selling put options and writing call options on equity indices, exchange-traded funds, and baskets of securities, correlated with the Fund’s portfolio, or Underlying Funds held in the Fund’s portfolio in order to partially reduce the exposure of the Fund to declines in the value of the Underlying Funds in its portfolio and to generate capital gains in declining markets by employing put spreads and generating premiums from writing call options. The net notional value of the call and put options entered into via the Option Strategy and the Collar Strategy may not exceed 25% of the Fund’s net assets. The adviser (“Adviser”) oversees the Sub-Adviser in managing the Fund. The Target Allocations may be changed by the Sub-Adviser at any time, and actual allocations of the Fund’s assets will often deviate from the Target Allocations due to a “Tactical Asset Allocation Strategy.” The Tactical Asset Allocation Strategy will seek to evaluate the attractiveness of a range of asset classes and investment strategies to position the Fund to benefit from pricing inefficiencies. The Tactical Asset Allocation Strategy seeks to derive its source of outperformance from macro or “top down” decisions. The Fund may be rebalanced periodically to return to the Target Allocations and inflows and outflows may be managed to attain the Target Allocations.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Fund. The value of your investment in the Fund changes with the values of the Underlying Funds and their investments. Any of the following risks, among others, could affect the Fund’s or an Underlying Fund’s performance or cause the Fund or an Underlying Fund to lose money or to underperform market averages of other funds. Asset Allocation    Assets will be allocated among Underlying Funds and markets based on judgments by the Adviser or Sub-Adviser. There is a risk that the Fund may allocate assets to an Underlying Fund or asset class that underperforms other funds or asset classes. Call    During periods of falling interest rates, a bond issuer may “call” or repay its high-yielding bond before the bond’s maturity date. If forced to invest the unanticipated proceeds at lower interest rates, the Fund or an Underlying Fund would experience a decline in income. Commodities    The operations and financial performance of companies in natural resources industries may be directly affected by commodity prices. This risk is exacerbated for those natural resources companies that own the underlying commodity. Company    The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless. Credit    Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether. Credit Default Swaps    The Fund or an Underlying Fund may enter into credit default swaps, either as a buyer or a seller of the swap. As a buyer of the swap, the Fund or an Underlying Fund pays a fee to protect against the risk that a security held by the Fund or the Underlying Fund will default. As a seller of the swap, the Fund or an Underlying Fund receives payment(s) in return for its obligation to pay the counterparty the full national value of the security in the event of a default of the security issuer. As a seller of a swap, the Fund or an Underlying Fund would effectively add leverage to its portfolio because, in addition to its total net assets, the Fund or an Underlying Fund would be subject to investment exposure on the notional value of the swap. Credit default swaps are largely unregulated and susceptible to liquidity, credit, and counterparty risks. Currency    To the extent that the Fund or an Underlying Fund invests directly in foreign currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivative Instruments    Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund or an Underlying Fund and reduce its returns. Foreign Investments/Developing and Emerging Markets    Investing in foreign (non-U.S.) securities may result in the Fund or the Underlying Funds experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets. High-Yield Securities    Investments rated below investment-grade (or of similar quality if unrated) are known as “high-yield securities” or “junk bonds.” High-yield securities are subject to greater levels of credit and liquidity risks. High-yield securities are considered primarily speculative with respect to the issuer’s continuing ability to make principal and interest payments. Inflation-Indexed Bonds    If the index measuring inflation falls, the principal value of inflation-indexed bonds will be adjusted downward, and consequently the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-indexed bonds. For bonds that do not provide a similar guarantee, the adjusted principal value of the bond repaid at maturity may be less than the original principal. Interest Rate    With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk. Investment Model    The Fund or certain Underlying Funds invest based on a proprietary model managed by the manager. The manager’s proprietary model may not adequately address existing or unforeseen market factors or the interplay between such factors. Liquidity    If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund. Market     Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. Market Capitalization    Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Fund or an Underlying Fund that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns. Options    The Fund could lose money if it sells call options on securities or indices whose value then rises above the buyer’s exercise price. By selling call options to hedge against the risk of loss on its investments, the Fund could miss out on gains. Other Investment Companies    The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund. Over-the-Counter Investments    Investments purchased over-the-counter (“OTC”), including securities and derivatives, can involve greater risks than securities traded on recognized stock exchanges. OTC securities are generally securities of smaller or newer companies that may have limited product lines and markets compared to larger companies. They also can have less management depth, more reliance on key personnel, and less access to capital and credit. OTC securities tend to trade less frequently and in lower volume, and as a result have greater liquidity risk. Many of the protections afforded to participants on some organized exchanges, such as the performance guarantee of an exchange clearing house, are not available in connection with OTC derivatives transactions. Additionally, OTC investments are generally purchased either directly from a dealer or in negotiated transactions with the issuer and as such may expose an Underlying Fund to counterparty risk. Proprietary Hedge Fund Beta Strategy    Because the Fund may allocate assets to an Underlying Fund that seeks to deliver returns that approximate the beta component of the broad universe of hedge fund returns, the Fund’s performance may be lower than the returns of the broader stock market. Real Estate Companies and Real Estate Investment Trusts (“REITs”)    Investing in real estate companies and REITs may subject the Fund to risks similar to those associated with the direct ownership of real estate, including losses from casualty or condemnation, changes in local and general economic conditions, supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes, and operating expenses in addition to terrorist attacks, war, or other acts that destroy real property. Short Exposures    The Fund may invest in an Underlying Fund that takes short exposure on market indices by investing in an instrument or derivative that rises in value with a fall in the related index. If the price of the index rises while an Underlying Fund has a short exposure to it, the Underlying Fund may have to cover its short exposure at a loss. Short exposures are subject to credit risks related to the counterparty’s ability to perform its obligations and, further, that any deterioration in the counterparty’s creditworthiness could adversely affect the value of the instrument or derivative. The potential loss on a short exposure is unlimited because the loss increases as the price of the instrument sold short increases. U.S. Government Securities and Obligations    U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180. Because Class W shares did not have a full calendar year of operations as of December 31, 2011, no performance information for Class W shares is provided below.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-992-0180
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.INGFunds.com/literature
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of future results.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns Class A (as of December 31 of each year)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best quarter: 2nd, 2009, 11.81% and Worst quarter: 4th, 2008, (13.66)% The Fund's Class A shares' year-to-date total return as of June 30, 2012: 5.37%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns% (for the periods ended December 31, 2011)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	However, the table includes all applicable fees and sales charges.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.
ING Capital Allocation Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.08%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.77%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.35%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.15%
1 Yr	rr_ExpenseExampleYear01	685
3 Yrs	rr_ExpenseExampleYear03	959
5 Yrs	rr_ExpenseExampleYear05	1,254
10 Yrs	rr_ExpenseExampleYear10	2,089
1 Yr	rr_ExpenseExampleNoRedemptionYear01	685
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	959
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,254
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,089
2002	rr_AnnualReturn2002	(5.36%)
2003	rr_AnnualReturn2003	12.93%
2004	rr_AnnualReturn2004	7.58%
2005	rr_AnnualReturn2005	3.31%
2006	rr_AnnualReturn2006	7.85%
2007	rr_AnnualReturn2007	5.23%
2008	rr_AnnualReturn2008	(23.91%)
2009	rr_AnnualReturn2009	17.31%
2010	rr_AnnualReturn2010	13.46%
2011	rr_AnnualReturn2011	(2.00%)
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	5.37%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.81%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(13.66%)
1 Yr	rr_AverageAnnualReturnYear01	(7.64%)
5 Yrs	rr_AverageAnnualReturnYear05	(0.32%)
10 Yrs	rr_AverageAnnualReturnYear10	2.34%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 20, 1997
ING Capital Allocation Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Management Fees	rr_ManagementFeesOverAssets	0.08%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.77%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.10%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.90%
1 Yr	rr_ExpenseExampleYear01	693
3 Yrs	rr_ExpenseExampleYear03	939
5 Yrs	rr_ExpenseExampleYear05	1,311
10 Yrs	rr_ExpenseExampleYear10	2,223
1 Yr	rr_ExpenseExampleNoRedemptionYear01	193
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	639
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,111
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,223
1 Yr	rr_AverageAnnualReturnYear01	(7.49%)
5 Yrs	rr_AverageAnnualReturnYear05	(0.22%)
10 Yrs	rr_AverageAnnualReturnYear10	2.19%
Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 01, 1999
ING Capital Allocation Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.08%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.77%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.10%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.90%
1 Yr	rr_ExpenseExampleYear01	293
3 Yrs	rr_ExpenseExampleYear03	639
5 Yrs	rr_ExpenseExampleYear05	1,111
10 Yrs	rr_ExpenseExampleYear10	2,415
1 Yr	rr_ExpenseExampleNoRedemptionYear01	193
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	639
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	1,111
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	2,415
1 Yr	rr_AverageAnnualReturnYear01	(3.63%)
5 Yrs	rr_AverageAnnualReturnYear05	0.14%
10 Yrs	rr_AverageAnnualReturnYear10	2.19%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1998
ING Capital Allocation Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.08%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.11%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.77%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.04%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.90%
1 Yr	rr_ExpenseExampleYear01	92
3 Yrs	rr_ExpenseExampleYear03	317
5 Yrs	rr_ExpenseExampleYear05	560
10 Yrs	rr_ExpenseExampleYear10	1,258
1 Yr	rr_ExpenseExampleNoRedemptionYear01	92
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	317
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	560
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,258
1 Yr	rr_AverageAnnualReturnYear01	(1.67%)
5 Yrs	rr_AverageAnnualReturnYear05	1.15%
10 Yrs	rr_AverageAnnualReturnYear10	3.22%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 04, 1995
ING Capital Allocation Fund | Class O
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.08%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.77%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.35%	[2]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)	[3]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	1.15%
1 Yr	rr_ExpenseExampleYear01	117
3 Yrs	rr_ExpenseExampleYear03	408
5 Yrs	rr_ExpenseExampleYear05	720
10 Yrs	rr_ExpenseExampleYear10	1,606
1 Yr	rr_ExpenseExampleNoRedemptionYear01	117
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	408
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	720
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,606
1 Yr	rr_AverageAnnualReturnYear01	(1.98%)
5 Yrs	rr_AverageAnnualReturnYear05	0.90%
since inception	rr_AverageAnnualReturnSinceInception	1.12%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 15, 2006
ING Capital Allocation Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.08%	[4]
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none	[4]
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.08%	[4]
Other Expenses	rr_OtherExpensesOverAssets	0.17%	[4]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.77%	[4]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.10%	[2],[4]
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)	[3],[4]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.90%	[4]
1 Yr	rr_ExpenseExampleYear01	92
3 Yrs	rr_ExpenseExampleYear03	330
5 Yrs	rr_ExpenseExampleYear05	587
10 Yrs	rr_ExpenseExampleYear10	1,322
1 Yr	rr_ExpenseExampleNoRedemptionYear01	92
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	330
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	587
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,322
ING Capital Allocation Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(8.41%)
5 Yrs	rr_AverageAnnualReturnYear05	(1.70%)
10 Yrs	rr_AverageAnnualReturnYear10	1.26%
ING Capital Allocation Fund | After tax on distributions with sale | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(4.78%)
5 Yrs	rr_AverageAnnualReturnYear05	(0.98%)
10 Yrs	rr_AverageAnnualReturnYear10	1.48%
ING Capital Allocation Fund | S&P Target Risk Growth Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.30%	[5]
5 Yrs	rr_AverageAnnualReturnYear05		[5],[6]
10 Yrs	rr_AverageAnnualReturnYear10		[5],[6]
ING Capital Allocation Fund | S&P Target Risk Growth Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.30%	[5]
5 Yrs	rr_AverageAnnualReturnYear05		[5],[6]
10 Yrs	rr_AverageAnnualReturnYear10		[5],[6]
ING Capital Allocation Fund | S&P Target Risk Growth Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.30%	[5]
5 Yrs	rr_AverageAnnualReturnYear05		[5],[6]
10 Yrs	rr_AverageAnnualReturnYear10		[5],[6]
ING Capital Allocation Fund | S&P Target Risk Growth Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.30%	[5]
5 Yrs	rr_AverageAnnualReturnYear05		[5],[6]
10 Yrs	rr_AverageAnnualReturnYear10		[5],[6]
ING Capital Allocation Fund | S&P Target Risk Growth Index | Class O
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.30%	[5]
5 Yrs	rr_AverageAnnualReturnYear05		[5],[6]
since inception	rr_AverageAnnualReturnSinceInception		[5],[6]
ING Capital Allocation Fund | BCAB Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	7.84%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	6.50%	[5]
10 Yrs	rr_AverageAnnualReturnYear10	5.78%	[5]
ING Capital Allocation Fund | BCAB Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	7.84%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	6.50%	[5]
10 Yrs	rr_AverageAnnualReturnYear10	5.78%	[5]
ING Capital Allocation Fund | BCAB Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	7.84%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	6.50%	[5]
10 Yrs	rr_AverageAnnualReturnYear10	5.78%	[5]
ING Capital Allocation Fund | BCAB Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	7.84%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	6.50%	[5]
10 Yrs	rr_AverageAnnualReturnYear10	5.78%	[5]
ING Capital Allocation Fund | BCAB Index | Class O
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	7.84%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	6.50%	[5]
since inception	rr_AverageAnnualReturnSinceInception	6.40%	[5],[7]
ING Capital Allocation Fund | MSCI EAFE Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(12.14%)	[8]
5 Yrs	rr_AverageAnnualReturnYear05	(4.72%)	[8]
10 Yrs	rr_AverageAnnualReturnYear10	4.67%	[8]
ING Capital Allocation Fund | MSCI EAFE Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(12.14%)	[8]
5 Yrs	rr_AverageAnnualReturnYear05	(4.72%)	[8]
10 Yrs	rr_AverageAnnualReturnYear10	4.67%	[8]
ING Capital Allocation Fund | MSCI EAFE Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(12.14%)	[8]
5 Yrs	rr_AverageAnnualReturnYear05	(4.72%)	[8]
10 Yrs	rr_AverageAnnualReturnYear10	4.67%	[8]
ING Capital Allocation Fund | MSCI EAFE Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(12.14%)	[8]
5 Yrs	rr_AverageAnnualReturnYear05	(4.72%)	[8]
10 Yrs	rr_AverageAnnualReturnYear10	4.67%	[8]
ING Capital Allocation Fund | MSCI EAFE Index | Class O
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	(12.14%)	[8]
5 Yrs	rr_AverageAnnualReturnYear05	(4.72%)	[8]
since inception	rr_AverageAnnualReturnSinceInception	(3.45%)	[7],[8]
ING Capital Allocation Fund | Russell 3000 Index | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.03%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	(0.01%)	[5]
10 Yrs	rr_AverageAnnualReturnYear10	3.51%	[5]
ING Capital Allocation Fund | Russell 3000 Index | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.03%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	(0.01%)	[5]
10 Yrs	rr_AverageAnnualReturnYear10	3.51%	[5]
ING Capital Allocation Fund | Russell 3000 Index | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.03%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	(0.01%)	[5]
10 Yrs	rr_AverageAnnualReturnYear10	3.51%	[5]
ING Capital Allocation Fund | Russell 3000 Index | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.03%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	(0.01%)	[5]
10 Yrs	rr_AverageAnnualReturnYear10	3.51%	[5]
ING Capital Allocation Fund | Russell 3000 Index | Class O
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	1.03%	[5]
5 Yrs	rr_AverageAnnualReturnYear05	(0.01%)	[5]
since inception	rr_AverageAnnualReturnSinceInception	0.64%	[5],[7]

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[2] Total Annual Fund Operating Expenses shown may be higher than the Fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

[3] The adviser is contractually obligated to limit expenses to 1.15%, 1.90%, 1.90%, 0.90%, 1.15%, and 0.90% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through October 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, and extraordinary expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years.

[4] Based on Class A shares' expenses adjusted for class specific differences.

[5] The index returns do not reflect deductions for fees, expenses or taxes.

[6] The inception date of the S&P Target Risk Growth Index is January 31, 2007.

[7] Reflects index performance since the date closest to the Class' inception for which data is available.

[8] The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions or other expenses.

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ING Corporate Leaders 100 Fund

ING Corporate Leaders 100 Fund

INVESTMENT OBJECTIVE

The Fund seeks to outperform the S&P 500^® Index.

FEES AND EXPENSES OF THE FUND

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in ING Funds. More information about these and other discounts is available from your financial professional and in the discussion in the Sales Charges section of the Prospectus (page 37) or the Statement of Additional Information (page 139).

Shareholder Fees
Fees paid directly from your investment

Shareholder Fees ING Corporate Leaders 100 Fund	Maximum sales charge (load) as a % of offering price	Maximum deferred sales charge as a % of purchase or sales price, whichever is less
Class A	5.75%	none	[1]
Class B	none	5.00%
Class C	none	1.00%
Class I	none	none
Class O	none	none
Class R	none	none
Class W	none	none

Annual Fund Operating Expenses
Expenses you pay each year as a % of the value of your investment

Annual Fund Operating Expenses ING Corporate Leaders 100 Fund		Class A	Class B	Class C	Class I	Class O		Class R		Class W
Management Fees		0.40%	0.40%	0.40%	0.40%	0.40%	[1]	0.40%	[1]	0.40%
Distribution and/or Shareholder Services (12b-1) Fees		0.25%	1.00%	1.00%	none	0.25%	[1]	0.50%	[1]	none
Administrative Services Fees		0.10%	0.10%	0.10%	0.10%	0.10%	[1]	0.10%	[1]	0.10%
Other Expenses		0.85%	0.85%	0.85%	0.80%	0.85%	[1]	0.85%	[1]	0.85%
Total Annual Fund Operating Expenses		1.60%	2.35%	2.35%	1.30%	1.60%	[1]	1.85%	[1]	1.35%
Waivers and Reimbursements	[2]	(0.70%)	(0.70%)	(0.95%)	(0.65%)	(0.70%)	[1]	(0.70%)	[1]	(0.70%)
Total Annual Fund Operating Expenses after Waivers and Reimbursements		0.90%	1.65%	1.40%	0.65%	0.90%	[1]	1.15%	[1]	0.65%

Expense Examples $

The Examples are intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples show costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Examples also assume that your investment had a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example ING Corporate Leaders 100 Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	662	986	1,333	2,310
Class B	668	966	1,392	2,444
Class C	243	642	1,169	2,613
Class I	66	348	651	1,511
Class O	92	436	805	1,841
Class R	117	514	935	2,112
Class W	66	359	672	1,563

Expense Example, No Redemption ING Corporate Leaders 100 Fund (USD $)	1 Yr	3 Yrs	5 Yrs	10 Yrs
Class A	662	986	1,333	2,310
Class B	168	666	1,192	2,444
Class C	143	642	1,169	2,613
Class I	66	348	651	1,511
Class O	92	436	805	1,841
Class R	117	514	935	2,112
Class W	66	359	672	1,563

The Examples reflect applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.

Portfolio Turnover % of average value of portfolio

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Examples, affect the Fund’s performance.
During the most recent fiscal year, the Fund’s portfolio turnover rate was 92% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund invests primarily in equity securities of issuers listed on the Standard & Poor’s 100 Index (“Index”).
The Index, a subset of the S&P 500^® Index, is a capitalization-weighted index based on 100 highly capitalized stocks for which options are listed. The Index measures large company U.S. stock market performance. The minimum market capitalization level is reset periodically and will change with market conditions as the market capitalization range of the companies in the Index changes. The market capitalization of companies in the Index as of June 29, 2012 ranged from $17.2 billion to $546.1 billion.
Equity securities include, but are not limited to, common and preferred stock, warrants and convertible securities.
The Fund also invests in derivatives, including, but not limited to, futures. The Fund typically uses derivatives to substitute for taking a position in the underlying asset.
The Fund may also invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”).
Initially, the Index securities are equally weighted in the Fund’s investment portfolio, meaning that the securities of an Index issuer would represent approximately 1% of the Fund’s investment portfolio. This approach seeks to increase performance potential and tends to overweight undervalued securities.
If the value of the securities of a particular company appreciates more than 50% during a given quarter, it would be reduced to 1%. If the value of the securities of a particular company falls more than 30% during a calendar quarter, these securities will be sold.
The Fund’s investment portfolio will be rebalanced quarterly to re-align the Fund’s holdings to the 1% weightings. The Fund is not limited to either a “value” or “growth” style but will have a value bias.
The sub-adviser (“Sub-Adviser”) may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.
The Fund may lend portfolio securities on a short-term or long-term basis, up to 33¹ / ₃ % of its total assets.

PRINCIPAL RISKS

You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds.
Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless.
Convertible Securities   Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk.
Credit   Prices of bonds and other debt securities can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether.
Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns.
Index Strategy   The index selected may underperform the overall market and the Fund might fail to track its target index. The correlation between the Fund and index performance may be affected by the Fund’s expenses and the timing of purchases and redemptions of the Fund’s shares. The Fund’s actual holdings might not match the Index and the Fund’s effective exposure to index securities at any given time may not equal 100%.
Interest Rate   With bonds and other fixed rate debt securities, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the security, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk.
Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund.
Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. From time to time, the stock market may not favor the growth- or value-oriented securities in which the Fund invests. Rather, the market could favor securities to which the Fund is not exposed or may not favor equities at all.
Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund.
Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner.
An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

PERFORMANCE INFORMATION

The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the changes in the Fund’s performance from year to year, and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class A shares. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. Other class shares’ performance would be higher or lower than Class A shares’ performance because of the higher or lower expenses paid by Class A shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.

Calendar Year Total Returns Class A
(as of December 31 of each year)

Best quarter: 2nd, 2009, 20.19% and Worst quarter: 3rd, 2011, (14.73)%
The Fund’s Class A shares’ year-to-date total return as of June 30, 2012: 8.56%

Because Class O and Class R shares of the Fund had not commenced operations as of December 31, 2011, no performance information for Class O and Class R shares is provided below.

Average Annual Total Returns%
(for the periods ended December 31, 2011)

Average Annual Total Returns ING Corporate Leaders 100 Fund		1 Yr	5 Yrs	10 Yrs	since inception		Inception Date
Class A		(3.98%)			1.38%		Jun. 30, 2008
Class A After tax on distributions		(4.22%)			1.14%
Class A After tax on distributions with sale		(2.29%)			1.15%
Class A S&P 500 Index	[1]	2.11%			1.75%	[2]
Class B		(3.90%)			1.58%		Jun. 30, 2008
Class B S&P 500 Index	[1]	2.11%			1.75%	[2]
Class C		0.05%			2.43%		Jun. 30, 2008
Class C S&P 500 Index	[1]	2.11%			1.75%	[2]
Class I		2.12%			3.32%		Jun. 30, 2008
Class I S&P 500 Index	[1]	2.11%			1.75%	[2]
Class W		2.10%			3.37%		Jun. 30, 2008
Class W S&P 500 Index	[1]	2.11%			1.75%	[2]

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. In some cases the after-tax returns may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are shown for Class A shares only. After-tax returns for other classes will vary.

[1] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.

[1] Based on Class A shares' expenses adjusted for class specific differences.

[2] The adviser is contractually obligated to limit expenses to 0.90%, 1.65%, 1.45%, 0.65%, 0.90%, 1.15%, and 0.65% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through October 1, 2013; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the management agreement and is subject to possible recoupment by the adviser within three years. The Distributor is contractually obligated to waive 0.25% of the distribution fee for Class C shares of the Fund through October 1, 2013. The distribution fee waiver will automatically renew for one-year terms unless it is terminated or modified by the Fund's Board of Directors.

[1] The index returns do not reflect deductions for fees, expenses or taxes.

[2] Reflects index performance since the date closest to the Class' inception for which data is available.