10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________

FORM 10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED June 30, 2013

_____________________________

Commission File Number: 1-10551

______________________________

OMNICOM GROUP INC.

(Exact name of registrant as specified in its charter)

New York	13-1514814
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
437 Madison Avenue, New York, New York	10022
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (212) 415-3600

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

_____________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes  þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  þ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ Accelerated filer o Non-accelerated filer o Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes  o No þ

________________________

As of July 15, 2013, there were 257,192,964 shares of Omnicom Group Inc. Common Stock outstanding.

OMNICOM GROUP INC. AND SUBSIDIARIES

QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2013

TABLE OF CONTENTS

		Page
PART I.	FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets - June 30, 2013 and December 31, 2012	1
	Condensed Consolidated Statements of Income - Three and Six Months Ended June 30, 2013 and 2012	2
	Condensed Consolidated Statements of Comprehensive Income - Three and Six Months Ended June 30, 2013 and 2012	3
	Condensed Consolidated Statements of Cash Flows - Six Months Ended June 30, 2013 and 2012	4
	Notes to Condensed Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	13
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	27
Item 4.	Controls and Procedures	27
PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	28
Item 1A.	Risk Factors	28
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	28
Item 6.	Exhibits	28
SIGNATURES		29

Forward-Looking Statements

Certain of the statements in this Quarterly Report on Form 10-Q constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, from time to time, we or our representatives have made or may make forward-looking statements, orally or in writing. These statements relate to future events or future financial performance and involve known and unknown risks and other factors that may cause our actual or our industry’s results, levels of activity or achievement to be materially different from those expressed or implied by any forward-looking statements. These risks and uncertainties, including those resulting from specific factors identified under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” include, but are not limited to, our future financial position and results of operations, global economic conditions, losses on media purchases and production costs incurred on behalf of clients, reductions in client spending and/or a slowdown in client payments, competitive factors, changes in client communication requirements, managing conflicts of interest, the hiring and retention of personnel, maintaining a highly skilled workforce, our ability to attract new clients and retain existing clients, reliance on information technology systems, changes in government regulations impacting our advertising and marketing strategies, conditions in the credit markets, risks associated with assumptions we make in connection with our critical accounting estimates and legal proceedings, and our international operations, which are subject to the risks of currency fluctuations and foreign exchange controls. In some cases, forward-looking statements can be identified by terminology such as “may,” “will,” “could,” “would,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “predict,” “potential” or “continue” or the negative of those terms or other comparable terminology. These statements are our present expectations. Actual events or results may differ. We undertake no obligation to update or revise any forward-looking statement, except as required by law.

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

OMNICOM GROUP INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions)

	June 30, 2013			December 31, 2012
	(Unaudited)
ASSETS
Current Assets:
Cash and cash equivalents	$	1,399.9		$	2,678.3
Short-term investments, at cost	14.7			20.6
Accounts receivable, net of allowance for doubtful accounts of $30.3 and $35.9	6,637.0			6,958.2
Work in process	1,258.1			1,008.4
Other current assets	978.5			995.9
Total Current Assets	10,288.2			11,661.4
Property and Equipment at cost, less accumulated depreciation of $1,217.5 and $1,234.8	687.1			723.8
Equity Method Investments	147.4			155.2
Goodwill	8,707.7			8,844.2
Intangible Assets, net of accumulated amortization of $529.8 and $498.0	407.4			456.1
Other Assets	287.2			311.2
TOTAL ASSETS	$	20,525.0		$	22,151.9
LIABILITIES AND EQUITY
Current Liabilities:
Accounts payable	$	7,797.7		$	8,296.7
Customer advances	1,204.7			1,231.5
Current portion of debt	0.3			0.4
Short-term borrowings	12.8			6.4
Taxes payable	197.4			264.4
Other current liabilities	2,014.2			2,076.4
Total Current Liabilities	11,227.1			11,875.8
Long-Term Notes Payable	3,784.8			3,789.1
Convertible Debt	252.7			659.4
Long-Term Liabilities	689.5			739.9
Long-Term Deferred Tax Liabilities	864.9			933.0
Commitments and Contingent Liabilities (See Note 11)
Temporary Equity - Redeemable Noncontrolling Interests	196.7			198.4
Equity:
Shareholders’ Equity:
Preferred stock	—			—
Common stock	59.6			59.6
Additional paid-in capital	804.7			836.6
Retained earnings	8,676.5			8,394.4
Accumulated other comprehensive income (loss)	(397.4		)	(129.5		)
Treasury stock, at cost	(6,087.7		)	(5,700.3		)
Total Shareholders’ Equity	3,055.7			3,460.8
Noncontrolling interests	453.6			495.5
Total Equity	3,509.3			3,956.3
TOTAL LIABILITIES AND EQUITY	$	20,525.0		$	22,151.9

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

1

OMNICOM GROUP INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In millions, except per share amounts)

(Unaudited)

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Revenue	$	3,637.0	$	3,561.0	$	7,035.9	$	6,868.2
Operating Expenses	3,114.0		3,054.6		6,141.1		5,999.3
Operating Income	523.0		506.4		894.8		868.9
Interest Expense	49.2		44.0		98.2		82.5
Interest Income	8.5		9.1		16.5		18.5
Income Before Income Taxes and Income From Equity     Method Investments	482.3		471.5		813.1		804.9
Income Tax Expense	163.6		161.9		272.7		271.2
Income From Equity Method Investments	2.9		4.6		6.1		6.5
Net Income	321.6		314.2		546.5		540.2
Less: Net Income Attributed To Noncontrolling Interests	32.1		31.5		51.8		52.9
Net Income - Omnicom Group Inc.	$	289.5	$	282.7	$	494.7	$	487.3
Net Income Per Share - Omnicom Group Inc.:
Basic	$	1.09	$	1.03	$	1.86	$	1.76
Diluted	$	1.09	$	1.02	$	1.85	$	1.74
Dividends Declared Per Common Share	$	0.40	$	0.30	$	0.80	$	0.60

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

2

OMNICOM GROUP INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In millions)

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Net Income	$	321.6		$	314.2		$	546.5		$	540.2
Unrealized gain on available-for-sale securities, net of income taxes of $0.1 for the three months and $0.2 for the six months ended June 30, 2013	0.1			—			0.3			—
Foreign currency translation adjustment, net of income taxes of ($63.5) and ($66.2) for the three months and ($158.0) and ($16.4) for the six months ended June 30, 2013 and 2012, respectively	(123.3		)	(128.5		)	(306.6		)	(31.8		)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $1.1 and $0.9 for the three months and $2.4 and $1.6 for the six months ended June 30, 2013 and 2012, respectively	1.7			1.3			3.4			2.4
Other Comprehensive Income	(121.5		)	(127.2		)	(302.9		)	(29.4		)
Comprehensive Income	200.1			187.0			243.6			510.8
Less: Comprehensive Income attributed to      noncontrolling interests	7.6			24.4			16.8			48.0
Comprehensive Income - Omnicom Group Inc.	$	192.5		$	162.6		$	226.8		$	462.8

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

3

OMNICOM GROUP INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

	Six Months Ended June 30,
	2013			2012
Cash Flows from Operating Activities:
Net income	$	546.5		$	540.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	91.3			90.8
Amortization of intangible assets	50.6			47.9
Amortization of deferred gain from termination of interest rate swaps	(3.6		)	(3.7		)
Income from equity method investments, net of dividends received	0.7			(0.3		)
Provision for doubtful accounts	0.8			2.3
Share-based compensation	44.7			44.4
Excess tax benefit from share-based compensation	(28.8		)	(57.5		)
Change in operating capital	(635.7		)	(506.8		)
Net Cash Provided By Operating Activities	66.5			157.3
Cash Flows from Investing Activities:
Payments to acquire property and equipment	(69.0		)	(112.8		)
Payments to acquire businesses and interests in affiliates, net of cash acquired	(22.2		)	(105.2		)
Proceeds from investments	13.9			8.9
Net Cash Used In Investing Activities	(77.3		)	(209.1		)
Cash Flows from Financing Activities:
Proceeds from short-term debt	6.9			2.9
Proceeds from borrowings	—			746.8
Redemption of convertible debt	(406.7		)	—
Payments of dividends	(106.7		)	(153.5		)
Payments for repurchase of common stock	(556.1		)	(805.9		)
Proceeds from stock plans	35.0			177.6
Payments for acquisition of additional noncontrolling interests	(5.4		)	(2.6		)
Payments of dividends to noncontrolling interest shareholders	(59.9		)	(56.8		)
Payments of contingent purchase price obligations	(31.8		)	(5.4		)
Excess tax benefit on share-based compensation	28.8			57.5
Other, net	(18.0		)	(15.9		)
Net Cash Used In Financing Activities	(1,113.9		)	(55.3		)
Effect of exchange rate changes on cash and cash equivalents	(153.7		)	(8.8		)
Net Decrease in Cash and Cash Equivalents	(1,278.4		)	(115.9		)
Cash and Cash Equivalents at the Beginning of the Period	2,678.3			1,781.2
Cash and Cash Equivalents at the End of the Period	$	1,399.9		$	1,665.3

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

4

OMNICOM GROUP INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Presentation of Financial Statements

The terms “Omnicom,” “we,” “our” and “us” each refer to Omnicom Group Inc. and our subsidiaries, unless the context indicates otherwise. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP” or “GAAP”) for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, certain information and footnote disclosure have been condensed or omitted.

In our opinion, the accompanying unaudited condensed financial statements reflect all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation, in all material respects, of the information contained herein. These unaudited condensed financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2012 (“2012 Form 10-K”). Results for the interim periods are not necessarily indicative of results that may be expected for the year.

2. New Accounting Standards

On January 1, 2013, we adopted FASB Accounting Standards Update ("ASU") No. 2013-01, Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities ("ASU 2013-01"). ASU 2013-01 amended existing guidance by requiring additional disclosure about financial instruments and derivative instruments that are either (1) offset in the statement of financial position or (2) subject to an enforceable master netting arrangement. ASU 2013-01 requires retrospective disclosure for all comparative periods. The adoption of ASU 2013-01 did not have a material impact on our financial position or financial statement disclosure.

As of March 31, 2013, we adopted FASB ASU 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 amended existing guidance by requiring additional disclosure either on the face of the income statement or in the notes to the financial statements of significant amounts reclassified out of accumulated other comprehensive income. ASU 2013-01 requires prospective adoption, and effects financial statement disclosure only. The adoption of ASU 2013-01 had no affect on our results of operations or financial position.

3. Net Income per Common Share

Net income per common share is based on the weighted average number of common shares outstanding during each period. Diluted net income per common share is based on the weighted average number of common shares outstanding, plus, if dilutive, common share equivalents, which include outstanding stock options and restricted stock, and shares issuable for the conversion value of our convertible debt.

Net income per common share is calculated using the two-class method, which is an earnings allocation method for computing net income per common share when a company's capital structure includes common stock and participating securities. Our unvested restricted stock awards receive non-forfeitable dividends at the same rate as our common stock and therefore are considered participating securities. Under the two-class method, basic and diluted net income per common share is reduced for a presumed hypothetical distribution of earnings to holders of our unvested restricted stock.

5

The computation of basic and diluted net income per common share for the three and six months ended June 30, 2013 and 2012 is (in millions, except per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Net Income Available for Common Shares:
Net income - Omnicom Group Inc.	$	289.5		$	282.7		$	494.7		$	487.3
Net income allocated to participating securities	(7.8		)	(6.4		)	(13.4		)	(10.9		)
	$	281.7		$	276.3		$	481.3		$	476.4
Weighted Average Shares:
Basic	257.7			269.0			259.4			271.2
Dilutive stock options and restricted shares and shares issuable for the conversion value of convertible debt	1.5			2.8			1.3			2.7
Diluted	259.2			271.8			260.7			273.9
Anti-dilutive stock options and restricted shares	0.1			0.2			0.1			0.3
Net Income per Common Share - Omnicom Group Inc.:
Basic	$	1.09		$	1.03		$	1.86		$	1.76
Diluted	$	1.09		$	1.02		$	1.85		$	1.74

4. Goodwill and Intangible Assets

Goodwill and intangible assets at June 30, 2013 and December 31, 2012 were (in millions):

	2013						2012
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Goodwill	$	9,274.0	$	566.3	$	8,707.7	$	9,424.3	$	580.1	$	8,844.2
Intangible assets:
Purchased and internally developed software	$	282.3	$	222.9	$	59.4	$	283.3	$	218.8	$	64.5
Customer related and other	654.9		306.9		348.0		670.8		279.2		391.6
	$	937.2	$	529.8	$	407.4	$	954.1	$	498.0	$	456.1

We evaluate goodwill for impairment at least annually at the end of the second quarter of the year and whenever events or circumstances indicate the carrying value may not be recoverable. At June 30, 2013, we performed Step 1 of the annual impairment test and compared the fair value of each of our reporting units to its respective carrying value, including goodwill. Based on the results of our impairment tests, we concluded that our goodwill was not impaired at June 30, 2013 and 2012, because the fair value of each of our reporting units was substantially in excess of their respective net book value.

6

Change in goodwill for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
Balance January 1	$	8,844.2		$	8,456.3
Acquisitions	39.3			162.3
Dispositions	(7.1		)	(0.5		)
Foreign currency translation	(168.7		)	(18.5		)
Balance June 30	$	8,707.7		$	8,599.6

There were no goodwill impairment losses recorded in the first six months of 2013 or 2012 and there are no accumulated goodwill impairment losses. Goodwill resulting from acquisitions completed during 2013 and 2012 includes $5.8 million and $8.0 million, respectively, of goodwill attributed to noncontrolling interests in the acquired businesses.

5. Debt

Lines of Credit

We have committed and uncommitted lines of credit. We have a $2.5 billion committed line of credit ("Credit Agreement") with a consortium of banks expiring on October 12, 2016. We have the ability to classify borrowings under the Credit Agreement as long-term. The Credit Agreement supports the issuance of up to $1.5 billion of commercial paper. Commercial paper issuances reduce the amount available under the Credit Agreement. At June 30, 2013, there were no outstanding commercial paper issuances or borrowings under the Credit Agreement. At June 30, 2013 and December 31, 2012, we had various uncommitted lines of credit aggregating $970.9 million and $878.2 million, respectively.

Our available and unused lines of credit at June 30, 2013 and December 31, 2012 were (in millions):

	2013		2012
Credit Agreement	$	2,500.0	$	2,500.0
Uncommitted lines of credit	970.9		878.2
Available and unused lines of credit	$	3,470.9	$	3,378.2

The Credit Agreement contains financial covenants that restrict our ability to incur indebtedness as defined in the agreement. These financial covenants limit the Leverage Ratio of total consolidated indebtedness to total consolidated EBITDA to no more than 3 times for the most recently ended 12 month period (under the Credit Agreement, EBITDA is defined as earnings before interest, taxes, depreciation and amortization). We are also required to maintain a minimum Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5 times for the most recently ended 12 month period.At June 30, 2013 we were in compliance with these covenants, as our Leverage Ratio was 1.9 times and our Interest Coverage Ratio was 10.8 times. The Credit Agreement does not limit our ability to declare or pay dividends.

Short-Term Borrowings

Short-term borrowings of $12.8 million and $6.4 million at June 30, 2013 and December 31, 2012, respectively, represent bank overdrafts and credit lines of our international subsidiaries. The bank overdrafts and credit lines are treated as unsecured loans pursuant to the agreements supporting the facilities. Due to the short-term nature of these instruments, carrying value approximates fair value.

7

Long-Term Notes Payable

Long-term notes payable at June 30, 2013 and December 31, 2012 were (in millions):

	2013		2012
5.90% Senior Notes due April 15, 2016	$	1,000.0	$	1,000.0
6.25% Senior Notes due July 15, 2019	500.0		500.0
4.45% Senior Notes due August 15, 2020	1,000.0		1,000.0
3.625% Senior Notes due May 1, 2022	1,250.0		1,250.0
Other notes and loans	0.3		0.4
	3,750.3		3,750.4
Unamortized premium (discount) on Senior Notes, net	15.3		16.0
Deferred gain from termination of interest rate swaps on Senior Notes due 2016	19.5		23.1
	3,785.1		3,789.5
Less current portion	0.3		0.4
Long-term notes payable	$	3,784.8	$	3,789.1

Convertible Debt

Convertible debt at June 30, 2013 and December 31, 2012 was (in millions):

	2013		2012
Convertible Notes due July 31, 2032	$	252.7	$	252.7
Convertible Notes due June 15, 2033	—		0.1
Convertible Notes due July 1, 2038	—		406.6
	252.7		659.4
Less current portion	—		—
Convertible debt	$	252.7	$	659.4

On May 16, 2013, we called our Convertible Notes due June 15, 2033 (“2033 Notes”) and our Convertible Notes due July 1, 2038 (“2038 Notes”) for redemption on June 17, 2013 at a redemption price of 100% of the principal amount. As provided in the indenture governing the 2033 Notes and the 2038 Notes, prior to redemption the noteholders had the right to convert their notes into shares of our common stock at a conversion rate of 19.4174 shares per $1,000 principal amount at any time prior to June 13, 2013. Substantially all the noteholders exercised their conversion right. We paid $406.1 million in cash representing the principal amount of the 2033 Notes and 2038 Notes that were converted and issued 1,499,792 shares of our common stock to satisfy the conversion premium. On June 17, 2013, we paid $0.6 million to redeem the remaining 2033 Notes and 2038 Notes that were not converted.

On July 31, 2013, the holders of our Convertible Notes due July 31, 2032 can put their notes back to us for cash.

6. Segment Reporting

Our wholly and partially owned agencies operate within the advertising, marketing and corporate communications services industry. These agencies are organized into agency networks, virtual client networks, regional reporting units and operating groups. Consistent with our fundamental business strategy, our agencies serve similar clients, in similar industries and, in many cases, the same clients across a variety of geographic regions. In addition, our agency networks have similar economic characteristics including similar costs and long-term profit contribution. The main economic components of each agency are employee compensation and related costs and direct service costs and office and general costs, which include rent and occupancy costs, technology costs and other overhead expenses. Therefore, given these similarities, we aggregate our operating segments, which are our five agency networks, into one reporting segment.

8

Revenue and long-lived assets and goodwill by geographic area as of and for the periods ended June 30, 2013 and 2012 were (in millions):

	Americas		EMEA		Asia Pacific
2013
Revenue - Three months ended	$	2,160.7	$	1,086.6	$	389.7
Revenue - Six months ended	4,197.9		2,087.8		750.2
Long-lived assets and goodwill	6,062.7		2,759.3		572.8
2012
Revenue - Three months ended	$	2,111.4	$	1,071.0	$	378.6
Revenue - Six months ended	4,070.7		2,065.6		731.9
Long-lived assets and goodwill	6,053.2		2,665.3		579.3

The Americas is composed of the United States, Canada and Latin American countries. EMEA is composed of various Euro currency countries, the United Kingdom, other European countries that have not adopted the European Union Monetary standard, the Middle-East and Africa. Asia Pacific is composed of Australia, China, India, Japan, Korea, New Zealand, Singapore and other Asian countries.

7. Income Taxes

Our effective tax rate for the six months ended June 30, 2013 and 2012 was 33.5% and 33.7%, respectively.

In connection with the conversion of our 2033 Notes and 2038 Notes, we reclassified $52.7 million, representing the excess of the accreted value of the notes for income tax purposes over the conversion value, from long-term deferred tax liability to current taxes payable. In addition, we reclassified $34.5 million, representing the difference between the issue price of the notes and the conversion value, from long-term deferred tax liability to additional paid-in capital. We expect that the tax liability resulting from the conversion of the notes will be paid in the third and fourth quarters of 2013.

At June 30, 2013, our unrecognized tax benefits were $139.6 million. Of this amount, approximately $60.9 million would affect our effective tax rate upon resolution of the uncertain tax positions.

8. Pension and Other Postemployment Benefits

Defined Benefit Pension Plans

The components of net periodic benefit cost for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
Service cost	$	2.4		$	3.0
Interest cost	3.0			2.9
Expected return on plan assets	(1.3		)	(1.2		)
Amortization of prior service cost	1.6			1.6
Amortization of actuarial (gains) losses	2.3			0.7
	$	8.0		$	7.0

We contributed $2.4 million and $4.6 million to our defined benefit pension plans in the six months ended June 30, 2013 and 2012, respectively.

9

Postemployment Arrangements

The components of net periodic benefit cost for the six months ended June 30, 2013 and 2012 were (in millions):

	2013		2012
Service cost	$	2.2	$	2.0
Interest cost	2.0		2.3
Amortization of prior service cost	1.0		1.0
Amortization of actuarial (gains) losses	0.9		0.4
	$	6.1	$	5.7

Net periodic benefit cost is included in the salary and service costs component of operating expenses.

9. Operating Expenses

Operating expenses for the three and six months ended June 30, 2013 and 2012 were (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Salary and service costs	$	2,598.8	$	2,541.3	$	5,132.3	$	4,975.8
Office and general expenses	515.2		513.3		1,008.8		1,023.5
Operating expenses	$	3,114.0	$	3,054.6	$	6,141.1	$	5,999.3

10. Supplemental Cash Flow Data

Change in operating capital for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
(Increase) decrease in accounts receivable	$	134.4		$	570.6
(Increase) decrease in work in process and other current assets	(323.7		)	(221.3		)
Increase (decrease) in accounts payable	(298.6		)	(571.8		)
Increase (decrease) in customer advances and other current liabilities	(94.4		)	(319.1		)
Change in other assets and liabilities, net	(53.4		)	34.8
	$	(635.7	)	$	(506.8	)
Income taxes paid	$	277.1		$	237.0
Interest paid	$	96.3		$	75.1

In connection with the conversion of our 2033 Notes and our 2038 Notes, we issued 1,499,792 shares of our common stock to satisfy the conversion premium. Based on the closing prices of our common stock on the settlement dates, these issuances resulted in a non-cash, pre-tax financing activity of $95.4 million, for the six months ended June 30, 2013, excluding the cash tax benefit of $34.5 million.

11. Commitments and Contingent Liabilities

In the ordinary course of business, we are involved in various legal proceedings. We do not presently expect that these proceedings will have a material adverse effect on our results of operations or financial position.

10

12. Fair Value

Financial assets and liabilities measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 were (in millions):

June 30, 2013	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents	$	1,399.9					$	1,399.9
Short-term investments	14.7						14.7
Available-for-sale securities	4.5						4.5
Forward foreign exchange contracts			$	0.5			0.5
Liabilities:
Forward foreign exchange contracts			$	0.7			$	0.7
Contingent purchase price obligations					$	232.2	232.2

December 31, 2012	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents	$	2,678.3					$	2,678.3
Short-term investments	20.6						20.6
Available-for-sale securities	3.9						3.9
Forward foreign exchange contracts			$	0.5			0.5
Liabilities:
Contingent purchase price obligations					$	266.2	$	266.2

The reduction in Level 3 contingent purchase price obligations from $266.2 million at December 31, 2012 to $232.2 million at June 30, 2013 resulted primarily from payments of $31.8 million.

The carrying amount and fair value of our financial instruments at June 30, 2013 and December 31, 2012 were (in millions):

	2013				2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	$	1,399.9	$	1,399.9	$	2,678.3	$	2,678.3
Short-term investments	14.7		14.7		20.6		20.6
Forward foreign exchange contracts	0.5		0.5		0.5		0.5
Available-for-sale securities	4.5		4.5		3.9		3.9
Cost method investments	22.5		22.5		23.1		23.1
Liabilities:
Short-term borrowings	$	12.8	$	12.8	$	6.4	$	6.4
Forward foreign exchange contracts	0.7		0.7		—		—
Contingent purchase price obligations	232.2		232.2		266.2		266.2
Debt	4,037.8		4,252.8		4,448.9		4,857.3

The estimated fair value of derivative positions in forward foreign exchange contracts is determined using model-derived valuations, taking into consideration market rates and counterparty credit risk. The estimated fair value of the contingent purchase price obligation is calculated in accordance with the terms of each acquisition agreement and are appropriately discounted. The fair value of debt is based on quoted market prices.

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13. Changes in Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2013 were (in millions):

	Unrealized Gain and (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
Balance January 1	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
Other comprehensive income before reclassifications	0.3			—			(271.6		)	(271.3		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			3.4			—			3.4
Other comprehensive income	0.3			3.4			(271.6		)	(267.9		)
Balance June 30	$	(1.7	)	$	(86.4	)	$	(309.3	)	$	(397.4	)

Reclassifications from accumulated other comprehensive income (loss) for the six months ended June 30, 2013 were (in millions):

Amortization of defined benefit pension and postemployment plans:
Prior service cost	$	2.6
Actuarial (gains) losses	3.2
Net periodic benefit cost (see Note 8)	5.8
Income tax expense	2.4
Net of tax	$	3.4

14. Subsequent Events

We have evaluated events subsequent to the balance sheet date and determined there have not been any events that have occurred that would require adjustment to or disclosure in our unaudited condensed consolidated financial statements.

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Item2.  Management's Discussion And Analysis Of Financial Condition And Results Of Operations

EXECUTIVE SUMMARY

We are a strategic holding company. We provide professional services to clients through multiple agencies around the world. On a global, pan-regional and local basis, our agencies provide these services in the following disciplines: advertising, customer relationship management, or CRM, public relations and specialty communications. Our business model was built and continues to evolve around our clients. While our agencies operate under different names and frame their ideas in different disciplines, we organize our services around our clients. The fundamental premise of our business is that our clients’ specific requirements should be the central focus in how we deliver our services and allocate our resources. This client-centric business model results in multiple agencies collaborating in formal and informal virtual networks that cut across internal organizational structures to deliver consistent brand messages for a specific client and execute against each of our clients’ specific marketing requirements. We continually seek to grow our business with our existing clients by maintaining our client-centric approach, as well as expanding our existing business relationships into new markets and with new clients. In addition, we pursue selective acquisitions of complementary companies with strong entrepreneurial management teams that typically serve or have the ability to serve our existing client base.

As a leading global advertising, marketing and corporate communications company, we operate in all major markets around the world. We have a large and diverse client base. Our largest client accounted for 2.6% of our revenue for the six months ended June 30, 2013 and no other client accounted for more than 2.6% of our revenue. Our top 100 clients accounted for approximately 52% of our revenue for the six months ended June 30, 2013. Our business is spread across a number of industry sectors with no one industry comprising more than 15% of our revenue for the six months ended June 30, 2013. Although our revenue is generally balanced between the United States and international markets and we have a large and diverse client base, we are not immune to general economic downturns.

As described in more detail below, in the first six months of 2013, our revenue increased 2.4% compared to the first six months of 2012. Increased revenue in the United States and continued growth in the emerging markets of Asia and Latin America was partially offset by the on-going economic weakness in the Euro Zone.

Global economic conditions have a direct impact on our business and financial performance. In particular, current global economic conditions pose a risk that our clients may reduce future spending on advertising and marketing services which could reduce the demand for our services. In the first six months of 2013, the United States experienced modest economic growth and the major economies of Asia and Latin America continued to expand. However, the continuing fiscal issues faced by many countries in the Euro Zone has caused economic difficulty in certain of our Euro Zone markets. We will continue to closely monitor economic conditions, client revenue levels and other factors and, in response to reductions in our client revenue, if necessary, we will take actions available to us to align our cost structure and manage working capital. There can be no assurance whether, or to what extent, our efforts to mitigate any impact of future economic conditions, reductions in our client revenue, changes in client creditworthiness and other developments will be effective.

Certain business trends have had a positive impact on our business and industry. These trends include our clients increasingly expanding the focus of their brand strategies from national markets to pan-regional and global markets and integrating traditional and non-traditional marketing channels, as well as utilizing new communications technologies and emerging digital platforms. Additionally, in an effort to gain greater efficiency and effectiveness from their total marketing budgets, clients are increasingly requiring greater coordination of marketing activities and concentrating these activities with a smaller number of service providers. We believe these trends have benefited our business in the past and over the medium and long term will continue to provide a competitive advantage to us.

In the near term, barring unforeseen events and excluding the impact from changes in foreign exchange rates, as a result of continued improvement in operating performance by many of our agencies and new business activities, we expect our 2013 revenue to increase modestly in excess of the weighted average nominal GDP growth in our major markets. We expect to continue to identify acquisition opportunities intended to build upon the core capabilities of our strategic business platforms, expand our operations in the emerging markets and enhance our capabilities to leverage new technologies that are being used by marketers today.

Given our size and breadth, we manage our business by monitoring several financial indicators. The key indicators that we review focus on revenue and operating expenses. We analyze revenue growth by reviewing the components and mix of the growth, including growth by major geographic region, growth by major marketing discipline, impact from foreign currency fluctuations, growth from acquisitions and growth from our largest clients. In recent years, our revenue has been divided almost evenly between our domestic and international operations.

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For the quarter ended June 30, 2013, our revenue increased2.1% compared to the quarter ended June 30, 2012. Organic growth increased revenue 2.8% and acquisitions, net of dispositions reduced revenue 0.1%. The impact of foreign exchange rates reduced revenue 0.6%. Across our geographic markets, revenue increased2.4% in the United States, 5.1% in the United Kingdom and 2.9% in our other markets, primarily Asia and Latin America. Revenue decreased1.4% in our Euro markets. The change in revenue in the second quarter of 2013 compared to the second quarter of 2012 in our four fundamental disciplines was as follows: advertising increased3.2%, CRM decreased1.5%, public relations increased4.3% and specialty communications increased9.8%.

For the six months ended June 30, 2013, our revenue increased2.4% compared to the six months ended June 30, 2012. Organic growth increased revenue 2.8% and acquisitions, net of dispositions increased revenue 0.2%. The impact of foreign exchange rates reduced revenue 0.6%. Across our geographic markets, revenue increased3.3% in the United States, 5.4% in the United Kingdom and 2.9% in our other markets, primarily Asia and Latin America. Revenue decreased2.3% in our Euro markets. The change in revenue in the first six months of 2013 compared to the first six months of 2012 in our four fundamental disciplines was as follows: advertising increased4.4%, CRM decreased1.4%, public relations increased4.0% and specialty communications increased6.4%.

We measure operating expenses in two distinct cost categories: salary and service costs and office and general expenses. Salary and service costs consist of employee compensation and related costs and direct service costs. Office and general expenses consist of rent and occupancy costs, technology costs, depreciation and amortization and other overhead expenses. Each of our agencies requires professionals with a skill set that is common across our disciplines. At the core of this skill set is the ability to understand a client’s brand or product and its selling proposition and the ability to develop a unique message to communicate the value of the brand or product to the client’s target audience. The facility requirements of our agencies are similar across geographic regions and disciplines, and their technology requirements are generally limited to personal computers, servers and off-the-shelf software. Because we are a service business, we monitor salary and service costs and office and general costs in relation to revenue.

Salary and service costs tend to fluctuate in conjunction with changes in revenue. In the second quarter of 2013, salary and service costs increased$57.5 million compared to the second quarter of 2012 and in the first six months of 2013, salary and service costs increased$156.5 million compared to the first six months of 2012.

Office and general expenses are less directly linked to changes in our revenue than salary and service costs. In the second quarter of 2013, office and general expenses increased$1.9 million compared to the second quarter of 2012 and in the first six months of 2013, office and general expenses decreased$14.7 million compared to the first six months of 2012.

Operating margins were 12.7% for the first six months of 2013 and 2012 and EBITA margins increased to 13.4% for the first six months of 2013 from 13.3% for the first six months of 2012.

In the second quarter of 2013, net interest expense increased to $40.7 million compared to $34.9 million in the second quarter of 2012 and in the first six months of 2013, net interest expense increased to $81.7 million compared to $64.0 million in the first six months of 2012. Interest expense increased $5.2 million to $49.2 million in the second quarter of 2013 and interest expense increased $15.7 million to $98.2 million in the first six months of 2013. The increase in interest expense is primarily attributable to the issuance of our 3.625% Senior Notes due May 1, 2022, or the 2022 Notes, of which $750 million were issued in April 2012 and $500 million were issued in August 2012. Interest income decreased$0.6 million in the second quarter of 2013, compared to the second quarter of 2012 and interest income decreased$2.0 million in the first six months of 2013, compared to the first six months of 2012.

For the second quarter of 2013, our effective tax rate decreased to 33.9%, compared to 34.3% for the second quarter of 2012 and for the first six months of 2013, our effective tax rate decreased to 33.5%, compared to 33.7% for the first six months of 2012.

Net income - Omnicom Group Inc. in the second quarter of 2013increased$6.8 million, or 2.4%, to $289.5 million from $282.7 million in the second quarter of 2012 and net income - Omnicom Group Inc. in the first six months of 2013increased$7.4 million, or 1.5%, to $494.7 million from $487.3 million in the first six months of 2012. The period-over-period increase in net income - Omnicom Group Inc. is due to the factors described above. Diluted net income per common share - Omnicom Group Inc. increased6.9% to $1.09 in the second quarter of 2013, compared to $1.02 in the second quarter of 2012 and diluted net income per common share - Omnicom Group Inc. increased6.3% to $1.85 for the first six months of 2013, compared to $1.74 for the first six months of 2012 due to the factors described above, as well as the reduction in our weighted average common shares outstanding. The reduction in our weighted average common shares outstanding was the result of repurchases of our common stock, net of stock option exercises, shares issued under our employee stock purchase plan and shares issued upon conversion of our Convertible Notes due June 15, 2033, or 2033 Notes, and our Convertible Notes due July 1, 2038, or 2038 Notes.

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RESULTS OF OPERATIONS

Second Quarter 2013 Compared to Second Quarter 2012 (in millions)

	2013			2012
Revenue	$	3,637.0		$	3,561.0
Operating Expenses:
Salary and service costs	2,598.8			2,541.3
Office and general expenses	515.2			513.3
Total Operating Expenses	3,114.0			3,054.6
Add back: Amortization of intangible assets	25.3			24.0
	3,088.7			3,030.6
Earnings before interest, taxes and amortization of intangible assets (“EBITA”)	548.3			530.4
EBITA Margin - %	15.1		%	14.9		%
Deduct: Amortization of intangible assets	25.3			24.0
Operating Income	523.0			506.4
Operating Margin - %	14.4		%	14.2		%
Interest Expense	49.2			44.0
Interest Income	8.5			9.1
Income Before Income Taxes and Income From Equity Method Investments	482.3			471.5
Income Tax Expense	163.6			161.9
Income From Equity Method Investments	2.9			4.6
Net Income	321.6			314.2
Less: Net Income Attributed To Noncontrolling Interests	32.1			31.5
Net Income - Omnicom Group Inc.	$	289.5		$	282.7

EBITA, which we define as earnings before interest, taxes and amortization of intangible assets, and EBITA Margin, which we define as EBITA divided by Revenue, are Non-GAAP financial measures. We use EBITA and EBITA Margin as additional operating performance measures, which exclude the non-cash amortization expense of acquired intangible assets. The table above reconciles EBITA and EBITA Margin to the U.S. GAAP financial measure of Operating Income for the periods presented. We believe that EBITA and EBITA Margin are useful measures to evaluate the performance of our businesses. Non-GAAP financial measures should not be considered in isolation from or as a substitute for financial information presented in compliance with U.S. GAAP. Non-GAAP financial measures reported by us may not be comparable to similarly titled amounts reported by other companies.

Revenue: Revenue for the second quarter of 2013increased$76.0 million, or 2.1%, to $3,637.0 million from $3,561.0 million in the second quarter of 2012. Organic growth increased revenue $99.0 million and acquisitions, net of dispositions, reduced revenue $4.3 million. The impact of foreign exchange rates reduced revenue $18.7 million.

The components of the second quarter of 2013 revenue change in the United States (“Domestic”) and the remainder of the world (“International”) were (in millions):

	Total					Domestic					International
	$			%		$			%		$			%
Three months ended June 30, 2012	$	3,561.0				$	1,859.6				$	1,701.4
Components of revenue change:
Foreign exchange impact	(18.7		)	(0.6	)%	—			—	%	(18.7		)	(1.1	)%
Acquisitions, net of dispositions	(4.3		)	(0.1	)%	(6.7		)	(0.3	)%	2.4			0.2	%
Organic growth	99.0			2.8	%	51.1			2.7	%	47.9			2.8	%
Three months ended June 30, 2013	$	3,637.0		2.1	%	$	1,904.0		2.4	%	$	1,733.0		1.9	%

15

The components and percentages are calculated as follows:

• The foreign exchange impact is calculated by first converting the current period’s local currency revenue using the average exchange rates from the equivalent prior period to arrive at a constant currency revenue (in this case $3,655.7 million for the Total column in the table). The foreign exchange impact equals the difference between the current period revenue in U.S. dollars and the current period revenue in constant currency (in this case $3,637.0 million less $3,655.7 million for the Total column in the table).

• The acquisition component is calculated by aggregating the applicable prior period revenue of the acquired businesses, less revenue of any business included in the prior period revenue that was disposed of subsequent to the period.

• Organic growth is calculated by subtracting both the foreign exchange and acquisition components from total revenue growth.

• The percentage change is calculated by dividing the individual component amount by the prior period revenue base of that component (in the case $3,637.0 million for the Total column in the table).

Revenue for the second quarter of 2013 and the percentage change in revenue and organic growth from the second quarter of 2012 in our primary geographic markets were (in millions):

	Revenue		% Change		% Organic Growth
United States	$	1,904.0	2.4	%	2.7	%
Euro Markets	568.8		(1.4	)%	(3.0	)%
United Kingdom	326.7		5.1	%	7.4	%
Other	837.5		2.9	%	5.2	%
	$	3,637.0	2.1	%	2.8	%

In the second quarter of 2013, foreign exchange rate impacts reduced revenue 0.6%, or $18.7 million, compared to the second quarter of 2012. The most significant impacts resulted from the strengthening of the U.S. Dollar against the Japanese Yen and British Pound.

Assuming exchange rates at July 15, 2013 remain unchanged, we expect foreign exchange impacts to reduce 2013 revenue by approximately 1%.

Due to a variety of factors, in the normal course, our agencies both gain and lose business from clients each year. The net result through the first half of 2013 has been an overall gain in new business. Under our client-centric approach, we seek to broaden our relationships with all of our clients. Revenue from our largest client accounted for 2.8% and 2.9% of our revenue for the second quarter of 2013 and 2012, respectively. No other client represented more than 2.5% and 2.6% of revenue for the second quarter of 2013 and 2012, respectively. Our ten largest and 100 largest clients represented 19.3% and 52.5% of our revenue for the second quarter of 2013, respectively, and 19.6% and 52.7% of our revenue for the second quarter of 2012, respectively.

Driven by our clients’ continuous demand for more effective and efficient marketing activities, we strive to provide an extensive range of advertising, marketing and corporate communications services through various client-centric networks that are organized to meet specific client objectives. These services include advertising, brand consultancy, corporate social responsibility consulting, crisis communications, custom publishing, data analytics, database management, direct marketing, entertainment marketing, environmental design, experiential marketing, field marketing, financial/corporate business-to-business advertising, interactive marketing, marketing research, media planning and buying, mobile marketing, multi-cultural marketing, non-profit marketing, public affairs, public relations, reputation consulting, retail marketing, search engine marketing, social media marketing and sports and event marketing. In an effort to monitor the changing needs of our clients and to further expand the scope of our services to key clients, we monitor revenue across a broad range of disciplines and group them into the following four categories: advertising, CRM, public relations and specialty communications.

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Revenue for the second quarter of 2013 and 2012 and the percentage change in revenue and organic growth from the second quarter of 2012 by discipline was (in millions):

	Three Months Ended June 30,
	2013				2012				2013 vs 2012
	$		% of Revenue		$		% of Revenue		$			% Change		% Organic Growth
Advertising	$	1,759.6	48.4	%	$	1,704.2	47.9	%	$	55.4		3.2	%	4.3	%
CRM	1,255.4		34.5	%	1,274.1		35.8	%	(18.7		)	(1.5	)%	(0.5	)%
Public relations	336.1		9.2	%	322.2		9.0	%	13.9			4.3	%	3.8	%
Specialty communications	285.9		7.9	%	260.5		7.3	%	25.4			9.8	%	7.8	%
	$	3,637.0			$	3,561.0			$	76.0		2.1	%	2.8	%

We operate in a number of industry sectors. The percentage of our revenue by industry sector for the second quarter of 2013 and 2012 was:

Industry	2013		2012
Food and Beverage	14.1	%	14.0	%
Consumer Products	10.6	%	10.1	%
Pharmaceuticals and Health Care	10.4	%	10.1	%
Financial Services	8.4	%	8.8	%
Technology	9.0	%	8.9	%
Auto	7.8	%	9.0	%
Travel and Entertainment	6.6	%	5.8	%
Telecommunications	6.4	%	6.2	%
Retail	6.6	%	6.6	%
Other	20.1	%	20.5	%

Looking ahead to the remainder of the year, barring unforeseen events and excluding foreign rate exchange impacts, we expect our revenue to increase in excess of the weighted average nominal GDP growth as a result of increases in client spending and new business activities.

Operating Expenses: Operating expenses for the second quarter of 2013 compared to operating expenses for the second quarter of 2012 were (in millions):

	Three Months Ended June 30,
	2013						2012						2013 vs 2012
	$		% of Revenue		% of Total Operating Expenses		$		% of Revenue		% of Total Operating Expenses		$ Change		% Change
Revenue	$	3,637.0					$	3,561.0					$	76.0	2.1	%
Operating Expenses:
Salary and service costs	2,598.8		71.5	%	83.5	%	2,541.3		71.4	%	83.2	%	57.5		2.3	%
Office and general expenses	515.2		14.2	%	16.5	%	513.3		14.4	%	16.8	%	1.9		0.4	%
Operating Expenses	3,114.0		85.6	%			3,054.6		85.8	%			59.4		1.9	%
Operating Income	$	523.0	14.4	%			$	506.4	14.2	%			$	16.6	3.3	%

17

Salary and service costs tend to fluctuate in conjunction with changes in revenue. Salary and service costs increased$57.5 million in the second quarter of 2013, compared to the second quarter of 2012 reflecting growth in revenue, an increase in employee compensation, including severance, and a change related to the mix of our business during the quarter.

Office and general expenses are less directly linked to changes in our revenue than salary and service costs. Office and general expenses increased$1.9 million in the second quarter of 2013, compared to the second quarter of 2012 reflecting our continuing efforts to control the cost structures of our agencies.

Operating income for the second quarter of 2013increased3.3%, compared to the second quarter of 2012. Operating margins increased to 14.4% in 2013 from 14.2% in 2012 and EBITA margins increased to 15.1% in the second quarter of 2013 from 14.9% in the second quarter of 2012.

Net Interest Expense: Net interest expense increased to $40.7 million in the second quarter of 2013, compared to $34.9 million in the second quarter of 2012. Interest expense increased$5.2 million to $49.2 million. The increase in interest expense is primarily attributable to the issuance of $500 million of our 2022 Notes in August 2012. Interest income decreased$0.6 million in the second quarter of 2013.

Income Taxes: Our effective tax rate for the second quarter of 2013decreased to 33.9%, compared to 34.3% for the second quarter of 2012.

Net Income Per Common Share - Omnicom Group Inc.: For the foregoing reasons, net income - Omnicom Group Inc. in the second quarter of 2013increased$6.8 million, or 2.4%, to $289.5 million, compared to $282.7 million in the second quarter of 2012. Diluted net income per common share - Omnicom Group Inc. increased6.9% to $1.09 in the second quarter of 2013, compared to $1.02 in the second quarter of 2012 due to the factors described above, as well as the impact of the reduction in our weighted average common shares outstanding. The reduction in our weighted average common shares outstanding was the result of repurchases of our common stock, net of stock option exercises, shares issued under our employee stock purchase plan and shares issued upon the conversion of our 2033 Notes and 2038 Notes.

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First Six Months of 2013 Compared to First Six Months of 2012 (in millions)

	2013			2012
Revenue	$	7,035.9		$	6,868.2
Operating Expenses:
Salary and service costs	5,132.3			4,975.8
Office and general expenses	1,008.8			1,023.5
Total Operating Expenses	6,141.1			5,999.3
Add back: Amortization of intangible assets	50.6			47.9
	6,090.5			5,951.4
Earnings before interest, taxes and amortization of intangible assets (“EBITA”)	945.4			916.8
EBITA Margin - %	13.4		%	13.3		%
Deduct: Amortization of intangible assets	50.6			47.9
Operating Income	894.8			868.9
Operating Margin - %	12.7		%	12.7		%
Interest Expense	98.2			82.5
Interest Income	16.5			18.5
Income Before Income Taxes and Income From Equity Method Investments	813.1			804.9
Income Tax Expense	272.7			271.2
Income From Equity Method Investments	6.1			6.5
Net Income	546.5			540.2
Less: Net Income Attributed To Noncontrolling Interests	51.8			52.9
Net Income - Omnicom Group Inc.	$	494.7		$	487.3

EBITA, which we define as earnings before interest, taxes and amortization of intangible assets, and EBITA Margin, which we define as EBITA divided by Revenue, are Non-GAAP financial measures. We use EBITA and EBITA Margin as additional operating performance measures, which exclude the non-cash amortization expense of acquired intangible assets. The table above reconciles EBITA and EBITA Margin to the U.S. GAAP financial measure of Operating Income for the periods presented. We believe that EBITA and EBITA Margin are useful measures to evaluate the performance of our businesses. Non-GAAP financial measures should not be considered in isolation from or as a substitute for financial information presented in compliance with U.S. GAAP. Non-GAAP financial measures reported by us may not be comparable to similarly titled amounts reported by other companies.

Revenue: Revenue for the first six months of 2013increased$167.7 million, or 2.4%, to $7,035.9 million from $6,868.2 million in the first six months of 2012. Organic growth increased revenue $194.8 million and acquisitions, net of dispositions, increased revenue $11.1 million.The impact of foreign exchange rates reduced revenue $38.2 million.

The components of the first six months of 2013 revenue change in the United States (“Domestic”) and the remainder of the world (“International”) were (in millions):

	Total					Domestic					International
	$			%		$			%		$			%
Six months ended June 30, 2012	$	6,868.2				$	3,579.0				$	3,289.2
Components of revenue change:
Foreign exchange impact	(38.2		)	(0.6	)%	—			—	%	(38.2		)	(1.1	)%
Acquisitions, net of dispositions	11.1			0.2	%	(4.6		)	(0.1	)%	15.7			0.5	%
Organic growth	194.8			2.8	%	121.2			3.4	%	73.6			2.2	%
Six months ended June 30, 2013	$	7,035.9		2.4	%	$	3,695.6		3.3	%	$	3,340.3		1.6	%

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The components and percentages are calculated as follows:

• The foreign exchange impact is calculated by first converting the current period’s local currency revenue using the average exchange rates from the equivalent prior period to arrive at a constant currency revenue (in this case $7,035.9 million for the Total column in the table). The foreign exchange impact equals the difference between the current period revenue in U.S. dollars and the current period revenue in constant currency (in this case $7,035.9 million less $7,074.1 million for the Total column in the table).

• The acquisition component is calculated by aggregating the applicable prior period revenue of the acquired businesses, less revenue of any business included in the prior period revenue that was disposed of subsequent to the period.

• Organic growth is calculated by subtracting both the foreign exchange and acquisition components from total revenue growth.

• The percentage change is calculated by dividing the individual component amount by the prior period revenue base of that component (in the case $6,868.2 million for the Total column in the table).

Revenue for the first six months of 2013 and the percentage change in revenue and organic growth from the first six months of 2012 in our primary geographic markets were (in millions):

	Revenue		% Change		% Organic Growth
United States	$	3,695.6	3.3	%	3.4	%
Euro Markets	1,097.9		(2.3	)%	(3.4	)%
United Kingdom	629.9		5.4	%	5.0	%
Other	1,612.5		2.9	%	5.2	%
	$	7,035.9	2.4	%	2.8	%

In the first six months of 2013, foreign exchange rate impacts reduced revenue 0.6%, or $38.2 million, compared to the first six months of 2012. The most significant impacts resulted from the strengthening of the U.S. Dollar against the Japanese Yen, British Pound and Brazilian Real, partially offset by the weakening of the U.S. Dollar against the Euro.

Revenue from our largest client accounted for 2.6% and 2.7% of our revenue for the first six months of 2013 and 2012, respectively. No other client represented more than 2.6% and 2.5% of revenue for the first six months of 2013 and 2012, respectively. Our ten largest and 100 largest clients represented 19.1% and 52.1% of our revenue for the first six months of 2013, respectively and 19.1% and 51.8% of our revenue for the first six months of 2012, respectively.

Revenue for the first six months of 2013 and 2012 and the percentage change in revenue and organic growth by discipline was (in millions):

	Six Months Ended June 30,
	2013				2012				2013 vs 2012
	$		% of Revenue		$		% of Revenue		$			% Change		% Organic Growth
Advertising	$	3,411.4	48.5	%	$	3,267.4	47.6	%	$	144.0		4.4	%	5.1	%
CRM	2,428.2		34.5	%	2,462.7		35.8	%	(34.5		)	(1.4	)%	(0.6	)%
Public relations	654.5		9.3	%	629.1		9.2	%	25.4			4.0	%	2.9	%
Specialty communications	541.8		7.7	%	509.0		7.4	%	32.8			6.4	%	4.5	%
	$	7,035.9	100.0	%	$	6,868.2	100.0	%	$	167.7		2.4	%	2.8	%

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We operate in a number of industry sectors. The percentage of our revenue by industry sector for the first six months of 2013 and 2012 was:

Industry	2013		2012
Food and Beverage	13.9	%	13.9	%
Consumer Products	10.2	%	9.5	%
Pharmaceuticals and Health Care	10.1	%	9.9	%
Financial Services	8.3	%	8.8	%
Technology	9.0	%	8.8	%
Auto	7.9	%	8.6	%
Travel and Entertainment	6.5	%	6.0	%
Telecommunications	6.6	%	6.5	%
Retail	6.7	%	6.7	%
Other	20.8	%	21.3	%

Operating Expenses: Operating expenses for the first six months of 2013 compared to operating expenses for the first six months of 2012 were (in millions):

	Six Months Ended June 30,
	2013						2012						2013 vs 2012
	$		% of Revenue		% of Total Operating Expenses		$		% of Revenue		% of Total Operating Expenses		$ Change			% Change
Revenue	$	7,035.9					$	6,868.2					$	167.7		2.4	%
Operating Expenses:
Salary and service costs	5,132.3		72.9	%	83.6	%	4,975.8		72.4	%	82.9	%	156.5			3.1	%
Office and general expenses	1,008.8		14.3	%	16.4	%	1,023.5		14.9	%	17.1	%	(14.7		)	(1.4	)%
Operating Expenses	6,141.1		87.3	%			5,999.3		87.3	%			141.8			2.4	%
Operating Income	$	894.8	12.7	%			$	868.9	12.7	%			$	25.9		3.0	%

Salary and service costs tend to fluctuate in conjunction with changes in revenue. Salary and service costs increased$156.5 million for the first six months of 2013, compared to the first six months of 2012 reflecting growth in revenue and an increase in employee compensation, including severance, and increases related to changes in the mix of our business during the period.

Office and general expenses are less directly linked to changes in our revenue than salary and service costs. Office and general expenses decreased$14.7 million in the first six months of 2013, compared to the first six months of 2012, reflecting our continuing efforts to control the cost structures of our agencies.

Operating income for first six months of 2013increased3.0%, compared to the first six months of 2012. Operating margins were 12.7% in 2013 and 2012 and EBITA margins increased to 13.4% from 13.3%.

Net Interest Expense: Net interest expense increased to $81.7 million in the first six months of 2013, compared to $64.0 million in the first six months of 2012. Interest expense increased$15.7 million to $98.2 million. The increased interest expense is primarily attributable to the issuance $750 million of our 2022 Notes in April 2012 and $500 million of our 2022 Notes in August 2012. Interest income decreased$2.0 million in the first six months of 2013.

Income Taxes: Our effective tax rate for the first six months of 2013decreased to 33.5%, from 33.7% for the first six months of 2012.

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Net Income Per Common Share - Omnicom Group Inc.: For the foregoing reasons, net income - Omnicom Group Inc. for the first six months of 2013increased$7.4 million, or 1.5%, to $494.7 million, compared to $487.3 million for the first six months of 2012. Diluted net income per common share - Omnicom Group Inc. increased6.3% to $1.85 for the first six months of 2013, compared to $1.74 for the first six months of 2012 due to the factors described above, as well as the impact of the reduction in our weighted average common shares outstanding. The reduction in our weighted average common shares outstanding was the result of repurchases of our common stock, net of stock option exercises, shares issued under our employee stock purchase plan and shares issued upon the conversion of our 2033 Notes and 2038 Notes.

CRITICAL ACOUNTING POLICIES

For a more complete understanding of all of our accounting policies, our financial statements and the related management’s discussion and analysis of those results, readers are encouraged to consider this information together with our discussion of our critical accounting policies under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2012 Form 10-K.

Acquisitions and Goodwill

We have made and expect to continue to make selective acquisitions. In making acquisitions, the valuation of potential acquisitions is based on various factors, including specialized know-how, reputation, competitive position, geographic coverage and service offerings of the target businesses, as well as our experience and judgment.

Our acquisition strategy is focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of our various strategic business platforms and agency brands through the expansion of their geographic reach and/or their service capabilities to better serve our clients. Additional key factors we consider include the competitive position and specialized know-how of the acquisition targets. Accordingly, as is typical in most service businesses, a substantial portion of the intangible asset value we acquire is the know-how of the people, which is treated as part of goodwill and is not valued separately. For each acquisition, we undertake a detailed review to identify other intangible assets and a valuation is performed for all such identified assets. A significant portion of the identifiable intangible assets acquired is derived from customer relationships, including the related customer contracts, as well as trade names. In valuing these identified intangible assets, we typically use an income approach and consider comparable market participant measurements.

We evaluate goodwill for impairment at least annually at the end of the second quarter of the year and whenever events or circumstances indicate the carrying value may not be recoverable. We identified our regional reporting units as components of our operating segments, which are our five agency networks. The regional reporting units of each agency network are responsible for the agencies in their region. They report to the segment managers and facilitate the administrative and logistical requirements of our client-centric strategy for delivering services to clients in their regions. We have concluded that for each of our operating segments, their regional reporting units have similar economic characteristics and should be aggregated for purposes of testing goodwill for impairment at the operating segment level. Our conclusion was based on a detailed analysis of the aggregation criteria set forth in FASB ASC Topic 280, Segment Reporting, and the guidance set forth in FASB ASC Topic 350, Intangibles - Goodwill and Other. Consistent with our fundamental business strategy, the agencies within our regional reporting units serve similar clients in similar industries, and in many cases the same clients. In addition, the agencies within our regional reporting units have similar economic characteristics. The main economic components of each agency are employee compensation and related costs and direct service costs and office and general costs, which include rent and occupancy costs, technology costs that are generally limited to personal computers, servers and off-the-shelf software and other overhead expenses. Finally, the expected benefits of our acquisitions are typically shared across multiple agencies and regions as they work together to integrate the acquired agency into our client service strategy.

Estimates and Assumptions - Goodwill Impairment Review

We use the following valuation methodologies to determine the fair value of our reporting units: (1) the income approach, which utilizes discounted expected future cash flows, (2) comparative market participant multiples for EBITDA (earnings before interest, taxes, depreciation and amortization), and (3) when available, consideration of recent and similar purchase acquisition transactions.

In applying the income approach, we use estimates to derive the expected discounted cash flows (“DCF”) for each reporting unit that serves as the basis of our valuation. These estimates and assumptions include revenue growth and operating margin, EBITDA, tax rates, capital expenditures, weighted average cost of capital and related discount rates and expected long-term cash flow growth rates. All of these estimates and assumptions are affected by conditions specific to our businesses, economic conditions related to the industry we operate in, as well as conditions in the global economy. The assumptions that have the most significant effect on our valuations derived using a DCF methodology are: (1) the expected long-term growth rate of our reporting units' cash flows and (2) the weighted average cost of capital (“WACC”).

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The range of assumptions used for the long-term growth rate and WACC in our evaluations as of June 30, 2013 and 2012 were:

	June 30,
	2013	2012
Long-Term Growth Rate	4%	4%
WACC	10.1% - 10.7%	10.3% - 10.9%

Long-term growth rates represent our estimate of the long-term growth rate for our industry and most markets of the global economy we operate in. The average historical revenue growth rate of our reporting units for the past ten years was approximately 6.8% and the Average Nominal GDP growth of the countries comprising our major markets that account for substantially all of our revenue was 4.3% over the same period. We considered this history when determining the long-term growth rates used in our annual impairment test at June 30, 2013. We believe marketing expenditures over the long term have a high correlation to GDP. We also believe, based on our historical performance, that our long-term growth rate will exceed Average Nominal GDP growth in the markets we operate in. For our annual test as of June 30, 2013, we used an estimated long-term growth rate of 4% for all of our reporting units.

When performing our annual impairment test as of June 30, 2013 and estimating the future cash flows of our reporting units, we considered the current macroeconomic environment, as well as industry and market specific conditions at mid-year 2013. In the first half of 2013, we experienced an increase in our revenue of 2.8%, which excludes growth from acquisitions and the impact from changes in foreign exchange rates. However, the continuing fiscal issues faced by many countries in the Euro Zone has caused economic difficulty in certain of our Euro Zone markets. We considered the effect of these conditions in our annual impairment test.

The WACC is comprised of (1) a risk-free rate of return, (2) a business risk index ascribed to us and to companies in our industry comparable to our reporting units based on a market derived variable that measures the volatility of the share price of equity securities relative to the volatility of the overall equity market, (3) an equity risk premium that is based on the rate of return on equity of publicly traded companies with business characteristics comparable to our reporting units, and (4) a current after-tax market rate of return on debt of companies with business characteristics similar to our reporting units, each weighted by the relative market value percentages of our equity and debt.

Our five reporting units vary in size with respect to revenue and the amount of debt allocated to them. These differences drive variations in fair value among our reporting units. In addition, these differences as well as differences in book value, including goodwill, cause variations in the amount by which fair value exceeds book value among the reporting units. The reporting unit goodwill balances and debt vary by reporting unit primarily because our three legacy agency networks were acquired at the formation of Omnicom and were accounted for as a pooling of interests that did not result in any additional debt or goodwill being recorded. The remaining two agency networks were built through a combination of internal growth and acquisitions that were accounted for as purchase transactions and as a result, they have a relatively higher amount of goodwill and debt.

Conclusion - Goodwill Impairment Review

Under U.S. GAAP, we have the option of either assessing qualitative factors to determine whether it is more-likely-than-not that the carrying value of our reporting units exceeds their respective fair value or proceeding directly to Step 1 of the goodwill impairment test. Although not required, we performed Step 1 of the annual impairment test and compared the fair value of each of our reporting units to its respective carrying value, including goodwill. Based on the results of our impairment test, we concluded that our goodwill was not impaired at June 30, 2013, because the fair value of each of our reporting units was substantially in excess of their respective net book value. The minimum decline in fair value that one of our reporting units would need to experience in order to fail Step 1 of the goodwill impairment test was approximately 70%. Notwithstanding our belief that the assumptions we used in our impairment testing for our WACC and long-term growth rate are reasonable, we performed a sensitivity analysis for each of our reporting units. The results of this sensitivity analysis on our impairment test as of June 30, 2013 revealed that if WACC increased by 1% and/or long-term growth rate decreased by 1%, the fair value of each of our reporting units would continue to be substantially in excess of their respective net book values and would pass Step 1 of the impairment test.

We will continue to perform our impairment test at the end of the second quarter of each year unless events or circumstances trigger the need for an interim evaluation for impairment. The estimates we use in testing our goodwill for impairment do not constitute forecasts or projections of future results of operations, but rather are estimates and assumptions based on historical results and assessments of macroeconomic factors affecting our reporting units. We believe that our estimates and assumptions are reasonable, but they are subject to change from period to period. Actual results of operations and other factors will likely differ from the estimates used in our discounted cash flow valuation and it is possible that differences could be material. A

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change in the estimates we use could result in a decline in the estimated fair value of one or more of our reporting units from the amounts derived as of our latest valuation and could cause us to fail Step 1 of our goodwill impairment test if the estimated fair value for the reporting unit is less than the carrying value of the net assets of the reporting unit, including its goodwill. A large decline in estimated fair value of a reporting unit could result in a non-cash impairment charge and may have an adverse effect on our results of operations and financial position.

NEW ACCOUNTING STANDARDS

See Note 2 to our unaudited condensed consolidated financial statements for additional information.

LIQUIDITY AND CAPITAL RESOURCES

Cash Sources and Requirements, Including Contractual Obligations

Historically, the majority of our non-discretionary cash requirements have been funded from operating cash flow and cash on hand. Working capital is our principal non-discretionary funding requirement. In addition, we have contractual obligations related to our senior notes and convertible notes, our recurring business operations, primarily related to lease obligations, as well as contingent purchase price obligations (earn-outs) related to acquisitions completed in prior years.

Our principal discretionary cash uses include dividend payments, capital expenditures, payments for strategic acquisitions and repurchases of our common stock. Our discretionary spending is funded from operating cash flow and cash on hand. In addition, depending on the level of our discretionary activity and conditions in the capital markets, we may use other available sources of funding such as issuing commercial paper, borrowing under our Credit Agreement or other long-term borrowings to finance these activities. For the remainder of 2013, we expect that we should be able to fund both our non-discretionary cash requirements and our discretionary spending without incurring additional long-term debt. However, we may access the capital markets at any time if favorable conditions exist.

We have a seasonal cash requirement normally peaking during the second quarter primarily due to the timing of payments for incentive compensation, income taxes and contingent purchase price obligations. This typically results in a net borrowing requirement that decreases over the course of the year.

During the first six months of 2013, we generated $66.5 million of cash from operations, which included cash used for operating capital of $635.7 million. During the first six months of 2013, our discretionary spending during the period was primarily comprised of: dividend payments of $106.7 million, capital expenditures of $69.0 million, repurchases of our common stock of $492.3 million, net of proceeds from stock option exercises and related tax benefits and common stock sold to our employee stock purchase plan, dividends to noncontrolling interest shareholders of $59.9 million and acquisition payments, including contingent purchase price obligations and acquisition of additional shares of noncontrolling interests, of $59.4 million.

On May 16, 2013, we called our Convertible Notes due June 15, 2033 (“2033 Notes”) and our Convertible Notes due July 1, 2038 (“2038 Notes”) for redemption on June 17, 2013 at a redemption price of 100% of the principal amount. As provided in the indenture governing the 2033 Notes and the 2038 Notes, prior to redemption the noteholders had the right to convert their notes into shares of our common stock at a conversion rate of 19.4174 shares per $1,000 principal amount at any time prior to June 13, 2013. Substantially all the noteholders exercised their conversion right. We paid $406.1 million in cash representing the principal amount of the 2033 Notes and 2038 Notes that were converted and issued 1,499,792 shares of our common stock to satisfy the conversion premium. On June 17, 2013, we paid $0.6 million to redeem the remaining 2033 Notes and 2038 Notes that were not converted.

Cash Management

We manage our cash and liquidity centrally through our regional treasury centers in North America, Europe and Asia. The treasury centers are managed by our wholly-owned finance subsidiaries. Each day, operations with excess funds invest these funds with their regional treasury center. Likewise, operations that require funds borrow from their regional treasury center. The treasury centers aggregate the net position which is either invested with or borrowed from third parties. To the extent that our treasury centers require liquidity, they have the ability to access local currency uncommitted lines of credit, the Credit Agreement or issue up to a total of $1.5 billion of U.S. Dollar-denominated commercial paper. This process enables us to manage our debt balances more efficiently and utilize our cash more effectively, as well as better manage our risk to foreign exchange rate changes. In countries where we either do not conduct treasury operations or it is not feasible for one of our treasury centers to fund net borrowing requirements on an intercompany basis, we arrange for local currency uncommitted lines of credit.

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Our cash and cash equivalents decreased$1,278.4 million to $1,399.9 million and our short-term investments decreased$5.9 million to $14.7 million from December 31, 2012, primarily to fund the redemption of our 2033 Notes and 2038 Notes, as well as funding our seasonal working capital requirement. Short-term investments primarily consist of time deposits with financial institutions that we expect to convert into cash within our current operating cycle, generally one year.

At June 30, 2013, our foreign subsidiaries held substantially all of our cash and cash equivalents of $1,399.9 million. The majority of this cash is available to us, net of any taxes payable upon repatriation to the United States. Changes in international tax rules or changes in U.S. tax rules and regulations covering international operations and foreign tax credits may affect our future reported financial results or the way we conduct our business.

We have policies governing counterparty credit risk with financial institutions that hold our cash and cash equivalents. In countries where we conduct treasury operations, generally the counterparties are either branches or subsidiaries of institutions that are party to our Credit Agreement. These financial institutions generally have credit ratings equal to or better than our credit ratings. We have deposit limits for each of these institutions. In countries where we do not conduct treasury operations, we ensure that all cash is held by counterparties that meet specific minimum credit standards.

Debt Instruments and Related Covenants

We have committed and uncommitted lines of credit. We have a $2.5 billion committed line of credit, or Credit Agreement, with a consortium of banks expiring on October 12, 2016. We have the ability to classify borrowings under the Credit Agreement as long-term. The Credit Agreement supports the issuance of up to $1.5 billion of commercial paper. Commercial paper issuances reduce the amount available under the Credit Agreement.

Depending on market conditions at the time, we typically fund our day-to-day liquidity by issuing commercial paper, borrowing under our uncommitted lines of credit or drawing on our Credit Agreement. At June 30, 2013, there were no outstanding commercial paper issuances or borrowings under the Credit Agreement.

Commercial paper activity for the quarters ended June 30, 2013 and 2012, was (dollars in millions):

	2013			2012
Average amount outstanding during the quarter	$	592.5		$	483.5
Maximum amount outstanding during the quarter	$	947.7		$	837.2
Total issuances during the quarter	$	3,345.0		$	4,536.7
Average days outstanding	16.1			9.7
Weighted average interest rate	0.35		%	0.43		%

At June 30, 2013, short-term borrowings of $12.8 million represent bank overdrafts and lines of credit of our international subsidiaries. These bank overdrafts and lines of credit are treated as unsecured loans pursuant to the agreements supporting the facilities.

The Credit Agreement contains financial covenants that restrict our ability to incur indebtedness as defined in the agreement. These financial covenants limit the Leverage Ratio of total consolidated indebtedness to total consolidated EBITDA for the most recently ended 12 month period (under the Credit Agreement, EBITDA is defined as earnings before interest, taxes, depreciation and amortization) to no more than 3.0 times. We are also required to maintain a minimum Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5.0 times for the most recently ended 12 month period. At June 30, 2013 we were in compliance with these covenants as our Leverage Ratio was 1.9 times and our Interest Coverage Ratio was 10.8 times. The Credit Agreement does not limit our ability to declare or pay dividends.

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At June 30, 2013, the carrying value of our debt and amounts available under the Credit Agreement were (in millions):

	Debt		Available Credit
Short-term borrowings, due in less than one year	$	12.8	$	—
Outstanding Commercial Paper issuances	—		—
Borrowings under the Credit Agreement	—		2,500.0
5.90% Senior Notes due April 15, 2016	1,000.0		—
6.25% Senior Notes due July 15, 2019	500.0		—
4.45% Senior Notes due August 15, 2020	1,000.0		—
3.625% Senior Notes due May 1, 2022	1,250.0		—
Convertible Notes due July 31, 2032	252.7		—
Other debt	0.3		—
	4,015.8		2,500.0
Unamortized premium (discount) on Senior Notes, net	15.3		—
Deferred gain from termination of interest rate swaps on Senior Notes due 2016	19.5		—
	$	4,050.6	$	2,500.0

Credit Markets and Availability of Credit

We will continue to take actions available to us to respond to changing economic conditions and actively manage our discretionary expenditures and we will continue to monitor and manage the level of credit made available to our clients. We believe that these actions, in addition to operating cash flow and the availability of our Credit Agreement, are sufficient to fund our working capital needs and our discretionary spending.

In funding our day-to-day liquidity, we have historically been a participant in the commercial paper market. We expect to continue funding our day-to-day liquidity through the commercial paper market. However, prior disruptions in the credit markets led to periods of illiquidity in the commercial paper market and higher credit spreads. During these periods of disruption, we used our uncommitted lines of credit and borrowed under our Credit Agreement to mitigate these conditions and to fund our day-to-day liquidity. We will continue to closely monitor our liquidity and the credit markets. We cannot predict with any certainty the impact on us of any future disruptions in the credit markets.

On July 31, 2013, the holders of our Convertible Notes due July 31, 2032 can put their notes back to us for cash.

CREDIT RISK

We provide advertising, marketing and corporate communications services to several thousand clients who operate in nearly every industry sector of the global economy. In the normal course of business, we grant credit to qualified clients. Due to the diversified nature of our client base, we do not believe that we are exposed to a concentration of credit risk as our largest client accounted for 2.6% of our revenue for the first six months of 2013 and no other client accounted for more than 2.6% of our revenue for the first six months of 2013. However, during periods of economic downturn, the credit profiles of our clients could change.

In the normal course of business, we often enter into contractual commitments with media providers and agreements with production companies on behalf of our clients at levels that can substantially exceed the revenue from our services. Many of our agencies purchase media for our clients and act as an agent for a disclosed principal. These commitments are included in accounts payable when the media services are delivered by the media providers. While operating practices vary by country, media type and media vendor, in the United States and certain foreign markets, many of our contracts with media providers specify that if our client defaults on its payment obligation, then we are not liable to the media providers under the theory of sequential liability until we have been paid for the media by our client. In other countries, we manage our risk in other ways, including evaluating and monitoring our clients’ creditworthiness and, in many cases, obtaining credit insurance or requiring payment in advance. Further, in cases where we are committed to a media purchase and it becomes apparent that a client may be unable to pay for the media, options are potentially available to us in the marketplace, in addition to those cited above to

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mitigate the potential loss, including negotiating with media providers. In addition, our agencies incur production costs on behalf of clients. We usually act as an agent for a disclosed principal in the procurement of these services. We manage the risk of payment default by the client by having the production companies be subject to sequential liability or requiring at least partial payment in advance from our client. However, the agreements entered into, as well as the production costs incurred, are unique to each client. We have not experienced a material loss related to media purchases or production costs incurred on behalf of our clients. However, the risk of a material loss could significantly increase in a severe economic downturn.

ITEM 3. QUANTATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

As a global service business, we operate in multiple foreign currencies and issue debt in the capital markets. In the normal course of business, we are exposed to foreign currency fluctuations and the impact of interest rate changes. We limit these risks through risk management policies and procedures, including the use of derivatives. For foreign currency exposure, derivatives are used to better manage the cash flow volatility arising from foreign exchange rate fluctuations. For interest rate exposure, derivatives have been used to manage the related cost of debt.

As a result of using derivative instruments, we are exposed to the risk that counterparties to derivative contracts will fail to meet their contractual obligations. To mitigate the counterparty credit risk, we have a policy of only entering into contracts with carefully selected major financial institutions based on specific minimum credit standards and other factors.

Our 2012 Form 10-K provides a detailed discussion of the market risks affecting our operations. No material change has occurred in our market risks since the disclosure contained in our 2012 Form 10-K. See our discussion regarding current economic conditions in Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations, in the Executive Summary and Liquidity and Capital Resources sections.

ITEM 4. CONTROLS AND PROCEDURES

We maintain disclosure controls and procedures designed to ensure that information required to be disclosed in our SEC reports is recorded, processed, summarized and reported within applicable time periods. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in our reports that we file or submit under the Securities Exchange Act of 1934, as amended, or the Exchange Act, is accumulated and communicated to management, including our Chief Executive Officer, or CEO, and Chief Financial Officer, or CFO, as appropriate to allow timely decisions regarding required disclosure. We conducted an evaluation of the effectiveness of our disclosure controls and procedures as of June 30, 2013. Based on that evaluation, our CEO and CFO concluded that, as of June 30, 2013, our disclosure controls and procedures are effective to ensure that decisions can be made timely with respect to required disclosures, as well as ensuring that the recording, processing, summarization and reporting of information required to be included in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 are appropriate.

There have not been any changes in our internal control over financial reporting during our most recent fiscal quarter that have materially affected or are reasonably likely to materially affect our internal control over financial reporting.

KPMG LLP, an independent registered public accounting firm that audited our consolidated financial statements included in our 2012 Form 10-K, has issued an attestation report on Omnicom’s internal control over financial reporting as of December 31, 2012, dated February 19, 2013.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The information regarding legal proceedings described in Note 11 to the unaudited condensed consolidated financial statements set forth in Part I of this Quarterly Report on Form 10-Q is incorporated herein by reference.

Item 1A. Risk Factors

There have been no material changes to the risk factors disclosed in Item 1A in our 2012 Form 10-K.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Stock repurchase activity during the three months ended June 30, 2013 was:

Period	Total Number of Shares Purchased	Average Price Paid Per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs
April 2013	2,149,447	$59.17	—	—
May 2013	2,533,096	$61.13	—	—
June 2013	8,528	$62.50	—	—
	4,691,071	$60.23	—	—

During the three months ended June 30, 2013, we purchased 4,356,000 shares of our common stock in the open market for general corporate purposes and withheld 335,071 shares from employees to satisfy estimated tax obligations primarily related to stock option exercises and vesting of restricted stock. The value of the common stock withheld was based on the closing price of our common stock on the applicable exercise or vesting date.

There were no unregistered sales of our equity securities during the three months ended June 30, 2013.

Item 6. Exhibits

(a) Exhibits

10	Omnicom Group Inc. 2013 Incentive Award Plan (Appendix A to our Proxy Statement (File No. 1-10551) filed on April 11, 2013 and incorporate herein by reference).
12	Computation of Ratio of Earnings to Fixed Charges.
31.1	Certification of the Chief Executive Officer and President required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended.
31.2	Certification of the Executive Vice President and Chief Financial Officer required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended.
32	Certification of the Chief Executive Officer and President and the Executive Vice President and Chief Financial Officer required by Rule 13a-14(b) under the Securities Exchange Act of 1934, as amended, and 18 U.S.C. §1350.
101	Interactive Data File.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		OMNICOM GROUP INC.
Dated:	July 17, 2013	/s/ Randall J. Weisenburger
		Randall J. Weisenburger Executive Vice President and Chief Financial Officer (Principal Financial Officer and Authorized Signatory)

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EX-12

EXHIBIT 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(In millions, except ratios)

(Unaudited)

	For the Six Months Ended June 30, 2013
Earnings:
Income before income taxes	$813.1
Add: Dividends from affiliates	6.9
Fixed charges	166.0
Total earnings	$986.0
Fixed charges:
Interest expense (a)	$98.2
Rent expense interest factor (b)	67.8
Total fixed charges	$166.0
Ratio of earnings to fixed charges	5.94x

___________________

(a) Interest expense includes interest on third-party indebtedness.

(b) The rent expense interest factor reflects an appropriate portion (one-third) of rent expense representative of interest.

EX-31.1

Exhibit 31.1

CERTIFICATION

I, John D. Wren, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 of Omnicom Group Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	July 17, 2013	/s/ John D. Wren
		John D. Wren
		Chief Executive Officer and President

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Randall J. Weisenburger, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 of Omnicom Group Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	July 17, 2013	/s/ RandallJ. Weisenburger
		Randall J. Weisenburger
		Executive Vice President and
		Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION

Pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, in connection with the filing of Omnicom Group Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of Omnicom Group Inc. certifies that, to such officer's knowledge:

• the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

• the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Omnicom Group Inc. as of the dates and for the periods expressed in the Report.

Executed as of July 17, 2013.

/s/ JohnD. Wren
Name:	John D. Wren
Title:	Chief Executive Officer and President

/s/ RANDALL J. WEISENBURGER
Name:	Randall J. Weisenburger
Title:	Executive Vice President and Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, and will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent that Omnicom Group Inc. specifically incorporates it by reference.

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Supplemental Cash Flow

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow [Abstract]

Supplemental Cash Flow

Supplemental Cash Flow Data

Change in operating capital for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
(Increase) decrease in accounts receivable	$	134.4		$	570.6
(Increase) decrease in work in process and other current assets	(323.7		)	(221.3		)
Increase (decrease) in accounts payable	(298.6		)	(571.8		)
Increase (decrease) in customer advances and other current liabilities	(94.4		)	(319.1		)
Change in other assets and liabilities, net	(53.4		)	34.8
	$	(635.7	)	$	(506.8	)
Income taxes paid	$	277.1		$	237.0
Interest paid	$	96.3		$	75.1

In connection with the conversion of our 2033 Notes and our 2038 Notes, we issued 1,499,792 shares of our common stock to satisfy the conversion premium. Based on the closing prices of our common stock on the settlement dates, these issuances resulted in a non-cash, pre-tax financing activity of $95.4 million, for the six months ended June 30, 2013, excluding the cash tax benefit of $34.5 million.

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Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue	$ 3,637.0	$ 3,561.0	$ 7,035.9	$ 6,868.2
Operating Expenses	3,114.0	3,054.6	6,141.1	5,999.3
Operating Income	523.0	506.4	894.8	868.9
Interest Expense	49.2	44.0	98.2	82.5
Interest Income	8.5	9.1	16.5	18.5
Income Before Income Taxes and Income From Equity Method Investments	482.3	471.5	813.1	804.9
Income Tax Expense	163.6	161.9	272.7	271.2
Income From Equity Method Investments	2.9	4.6	6.1	6.5
Net Income	321.6	314.2	546.5	540.2
Less: Net Income Attributed To Noncontrolling Interests	32.1	31.5	51.8	52.9
Net Income - Omnicom Group Inc.	$ 289.5	$ 282.7	$ 494.7	$ 487.3
Net Income Per Share - Omnicom Group Inc.:
Basic	$ 1.09	$ 1.03	$ 1.86	$ 1.76
Diluted	$ 1.09	$ 1.02	$ 1.85	$ 1.74
Dividends Declared Per Common Share	$ 0.40	$ 0.30	$ 0.80	$ 0.60

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Net Income Per Common Share

6 Months Ended

Jun. 30, 2013

Net Income per Common Share [Abstract]

Net Income per Common Share

Net Income per Common Share

Net income per common share is based on the weighted average number of common shares outstanding during each period. Diluted net income per common share is based on the weighted average number of common shares outstanding, plus, if dilutive, common share equivalents, which include outstanding stock options and restricted stock, and shares issuable for the conversion value of our convertible debt.

Net income per common share is calculated using the two-class method, which is an earnings allocation method for computing net income per common share when a company's capital structure includes common stock and participating securities. Our unvested restricted stock awards receive non-forfeitable dividends at the same rate as our common stock and therefore are considered participating securities. Under the two-class method, basic and diluted net income per common share is reduced for a presumed hypothetical distribution of earnings to holders of our unvested restricted stock.

The computation of basic and diluted net income per common share for the three and six months ended June 30, 2013 and 2012 is (in millions, except per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Net Income Available for Common Shares:
Net income - Omnicom Group Inc.	$	289.5		$	282.7		$	494.7		$	487.3
Net income allocated to participating securities	(7.8		)	(6.4		)	(13.4		)	(10.9		)
	$	281.7		$	276.3		$	481.3		$	476.4
Weighted Average Shares:
Basic	257.7			269.0			259.4			271.2
Dilutive stock options and restricted shares and shares issuable for the conversion value of convertible debt	1.5			2.8			1.3			2.7
Diluted	259.2			271.8			260.7			273.9
Anti-dilutive stock options and restricted shares	0.1			0.2			0.1			0.3
Net Income per Common Share - Omnicom Group Inc.:
Basic	$	1.09		$	1.03		$	1.86		$	1.76
Diluted	$	1.09		$	1.02		$	1.85		$	1.74

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Debt (Tables)

6 Months Ended

Jun. 30, 2013

Available and Unused Lines of Credit

Our available and unused lines of credit at June 30, 2013 and December 31, 2012 were (in millions):

	2013		2012
Credit Agreement	$	2,500.0	$	2,500.0
Uncommitted lines of credit	970.9		878.2
Available and unused lines of credit	$	3,470.9	$	3,378.2

Long-Term Notes Payable [Member]

Long-Term Debt

Long-term notes payable at June 30, 2013 and December 31, 2012 were (in millions):

	2013		2012
5.90% Senior Notes due April 15, 2016	$	1,000.0	$	1,000.0
6.25% Senior Notes due July 15, 2019	500.0		500.0
4.45% Senior Notes due August 15, 2020	1,000.0		1,000.0
3.625% Senior Notes due May 1, 2022	1,250.0		1,250.0
Other notes and loans	0.3		0.4
	3,750.3		3,750.4
Unamortized premium (discount) on Senior Notes, net	15.3		16.0
Deferred gain from termination of interest rate swaps on Senior Notes due 2016	19.5		23.1
	3,785.1		3,789.5
Less current portion	0.3		0.4
Long-term notes payable	$	3,784.8	$	3,789.1

Convertible Debt [Member]

Long-Term Debt

Convertible debt at June 30, 2013 and December 31, 2012 was (in millions):

	2013		2012
Convertible Notes due July 31, 2032	$	252.7	$	252.7
Convertible Notes due June 15, 2033	—		0.1
Convertible Notes due July 1, 2038	—		406.6
	252.7		659.4
Less current portion	—		—
Convertible debt	$	252.7	$	659.4

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Commitments and Contingent Liabilities

6 Months Ended

Jun. 30, 2013

Commitments and Contingent Liabilities [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

In the ordinary course of business, we are involved in various legal proceedings. We do not presently expect that these proceedings will have a material adverse effect on our results of operations or financial position.

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Supplemental Cash Flow (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012
Changes in Operating Capital [Abstract]
(Increase) decrease in accounts receivable		$ 134.4	$ 570.6
(Increase) decrease in work in process and other current assets		(323.7)	(221.3)
Increase (decrease) in accounts payable		(298.6)	(571.8)
Increase (decrease) in customer advances and other current liabilities		(94.4)	(319.1)
Change in other assets and liabilities, net		(53.4)	34.8
Change in operating capital		635.7	506.8
Income taxes paid		277.1	237.0
Interest paid		96.3	75.1
Convertible Debt, Shares Issued for Conversion Premium	1,499,792	1,499,792
Convertible Debt, Fair Value of Common Stock Issued		95.4
Adjustment to Additional Paid-In Capital, Conversion of Convertible Debt	$ 34.5	$ 34.5

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Operating Expenses (Tables)

6 Months Ended

Jun. 30, 2013

Operating Expenses [Abstract]

Components of Operating Expenses

Operating expenses for the three and six months ended June 30, 2013 and 2012 were (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Salary and service costs	$	2,598.8	$	2,541.3	$	5,132.3	$	4,975.8
Office and general expenses	515.2		513.3		1,008.8		1,023.5
Operating expenses	$	3,114.0	$	3,054.6	$	6,141.1	$	5,999.3

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Pension and Other Postemployment Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Defined Benefit Pension Plans [Member]

Components of Net Periodic Benefit Cost

Defined Benefit Pension Plans

The components of net periodic benefit cost for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
Service cost	$	2.4		$	3.0
Interest cost	3.0			2.9
Expected return on plan assets	(1.3		)	(1.2		)
Amortization of prior service cost	1.6			1.6
Amortization of actuarial (gains) losses	2.3			0.7
	$	8.0		$	7.0

Postemployment Arrangements [Member]

Components of Net Periodic Benefit Cost

Postemployment Arrangements

The components of net periodic benefit cost for the six months ended June 30, 2013 and 2012 were (in millions):

	2013		2012
Service cost	$	2.2	$	2.0
Interest cost	2.0		2.3
Amortization of prior service cost	1.0		1.0
Amortization of actuarial (gains) losses	0.9		0.4
	$	6.1	$	5.7

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Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue	$ 3,637.0	$ 3,561.0	$ 7,035.9	$ 6,868.2
Americas
Revenue	2,160.7	2,111.4	4,197.9	4,070.7
Long-lived assets and goodwill	6,062.7	6,053.2	6,062.7	6,053.2
EMEA
Revenue	1,086.6	1,071.0	2,087.8	2,065.6
Long-lived assets and goodwill	2,759.3	2,665.3	2,759.3	2,665.3
Asia Pacific
Revenue	389.7	378.6	750.2	731.9
Long-lived assets and goodwill	$ 572.8	$ 579.3	$ 572.8	$ 579.3

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Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1			$ (129.5)
Other comprehensive income before reclassifications			(271.3)
Amounts reclassified from accumulated other comprehensive income (loss)			3.4
Other comprehensive income			(267.9)
Balance June 30	(397.4)		(397.4)
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Income Before Income Taxes and Income From Equity Method Investments	482.3	471.5	813.1	804.9
Income Tax Expense	163.6	161.9	272.7	271.2
Net Income	321.6	314.2	546.5	540.2
Unrealized Gain and (Loss) on Available-for-Sale Securities
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1			(2.0)
Other comprehensive income before reclassifications			0.3
Amounts reclassified from accumulated other comprehensive income (loss)			0
Other comprehensive income			0.3
Balance June 30	(1.7)		(1.7)
Defined Benefit Pension and Postemployment Plans
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1			(89.8)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			3.4
Other comprehensive income			3.4
Balance June 30	(86.4)		(86.4)
Defined Benefit Pension and Postemployment Plans | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Prior service cost			2.6
Actuarial (gains) losses			3.2
Income Before Income Taxes and Income From Equity Method Investments			5.8
Income Tax Expense			2.4
Net Income			3.4
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance January 1			(37.7)
Other comprehensive income before reclassifications			(271.6)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Other comprehensive income			(271.6)
Balance June 30	$ (309.3)		$ (309.3)

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Net Income Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income Available for Common Shares:
Net income - Omnicom Group Inc.	$ 289.5	$ 282.7	$ 494.7	$ 487.3
Net income allocated to participating securities	(7.8)	(6.4)	(13.4)	(10.9)
Net income available for common shares	$ 281.7	$ 276.3	$ 481.3	$ 476.4
Weighted Average Shares:
Basic	257.7	269.0	259.4	271.2
Dilutive stock options and restricted shares and shares issuable for the conversion value of convertible debt	1.5	2.8	1.3	2.7
Diluted	259.2	271.8	260.7	273.9
Anti-dilutive stock options and restricted shares	0.1	0.2	0.1	0.3
Net Income per Common Share - Omnicom Group Inc.:
Basic	$ 1.09	$ 1.03	$ 1.86	$ 1.76
Diluted	$ 1.09	$ 1.02	$ 1.85	$ 1.74

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Revenue and Long-Lived Assets and Goodwill by Geographic Area

Revenue and long-lived assets and goodwill by geographic area as of and for the periods ended June 30, 2013 and 2012 were (in millions):

	Americas		EMEA		Asia Pacific
2013
Revenue - Three months ended	$	2,160.7	$	1,086.6	$	389.7
Revenue - Six months ended	4,197.9		2,087.8		750.2
Long-lived assets and goodwill	6,062.7		2,759.3		572.8
2012
Revenue - Three months ended	$	2,111.4	$	1,071.0	$	378.6
Revenue - Six months ended	4,070.7		2,065.6		731.9
Long-lived assets and goodwill	6,053.2		2,665.3		579.3

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrealized gain on available-for-sale securities, income taxes	$ 0.1	$ 0	$ 0.2	$ 0
Foreign currency transaction and translation adjustments, income taxes	(63.5)	(66.2)	(158.0)	(16.4)
Defined benefit plans adjustment, income taxes	$ 1.1	$ 0.9	$ 2.4	$ 1.6

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Presentation of Financial Statements

6 Months Ended

Jun. 30, 2013

Presentation of Financial Statements [Abstract]

Presentation of Financial Statements

Presentation of Financial Statements

The terms “Omnicom,” “we,” “our” and “us” each refer to Omnicom Group Inc. and our subsidiaries, unless the context indicates otherwise. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP” or “GAAP”) for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, certain information and footnote disclosure have been condensed or omitted.

In our opinion, the accompanying unaudited condensed financial statements reflect all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation, in all material respects, of the information contained herein. These unaudited condensed financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2012 (“2012 Form 10-K”). Results for the interim periods are not necessarily indicative of results that may be expected for the year.

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Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill and intangible assets at June 30, 2013 and December 31, 2012 were (in millions):

	2013						2012
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Goodwill	$	9,274.0	$	566.3	$	8,707.7	$	9,424.3	$	580.1	$	8,844.2
Intangible assets:
Purchased and internally developed software	$	282.3	$	222.9	$	59.4	$	283.3	$	218.8	$	64.5
Customer related and other	654.9		306.9		348.0		670.8		279.2		391.6
	$	937.2	$	529.8	$	407.4	$	954.1	$	498.0	$	456.1

We evaluate goodwill for impairment at least annually at the end of the second quarter of the year and whenever events or circumstances indicate the carrying value may not be recoverable. At June 30, 2013, we performed Step 1 of the annual impairment test and compared the fair value of each of our reporting units to its respective carrying value, including goodwill. Based on the results of our impairment tests, we concluded that our goodwill was not impaired at June 30, 2013 and 2012, because the fair value of each of our reporting units was substantially in excess of their respective net book value.

Change in goodwill for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
Balance January 1	$	8,844.2		$	8,456.3
Acquisitions	39.3			162.3
Dispositions	(7.1		)	(0.5		)
Foreign currency translation	(168.7		)	(18.5		)
Balance June 30	$	8,707.7		$	8,599.6

There were no goodwill impairment losses recorded in the first six months of 2013 or 2012 and there are no accumulated goodwill impairment losses. Goodwill resulting from acquisitions completed during 2013 and 2012 includes $5.8 million and $8.0 million, respectively, of goodwill attributed to noncontrolling interests in the acquired businesses.

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New Accounting Standards

6 Months Ended

Jun. 30, 2013

New Accounting Standards [Abstract]

New Accounting Standards

New Accounting Standards

On January 1, 2013, we adopted FASB Accounting Standards Update ("ASU") No. 2013-01, Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities ("ASU 2013-01"). ASU 2013-01 amended existing guidance by requiring additional disclosure about financial instruments and derivative instruments that are either (1) offset in the statement of financial position or (2) subject to an enforceable master netting arrangement. ASU 2013-01 requires retrospective disclosure for all comparative periods. The adoption of ASU 2013-01 did not have a material impact on our financial position or financial statement disclosure.

As of March 31, 2013, we adopted FASB ASU 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 amended existing guidance by requiring additional disclosure either on the face of the income statement or in the notes to the financial statements of significant amounts reclassified out of accumulated other comprehensive income. ASU 2013-01 requires prospective adoption, and effects financial statement disclosure only. The adoption of ASU 2013-01 had no affect on our results of operations or financial position.

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Supplemental Cash Flow (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow [Abstract]

Changes in Operating Capital

Change in operating capital for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
(Increase) decrease in accounts receivable	$	134.4		$	570.6
(Increase) decrease in work in process and other current assets	(323.7		)	(221.3		)
Increase (decrease) in accounts payable	(298.6		)	(571.8		)
Increase (decrease) in customer advances and other current liabilities	(94.4		)	(319.1		)
Change in other assets and liabilities, net	(53.4		)	34.8
	$	(635.7	)	$	(506.8	)
Income taxes paid	$	277.1		$	237.0
Interest paid	$	96.3		$	75.1

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Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Goodwill, Gross Carrying Value	$ 9,274.0		$ 9,424.3
Goodwill, Accumulated Amortization	566.3		580.1
Goodwill, Net Carrying Value	8,707.7	8,599.6
Intangible assets:, Gross Carrying Value	937.2		954.1
Intangible assets:, Accumulated Amortization	529.8		498.0
Intangible assets:, Net Carrying Value	407.4		456.1
Goodwill [Roll Forward]
Goodwill, Balance January 1	8,844.2	8,456.3
Goodwill, Acquisitions	39.3	162.3
Goodwill, Dispositions	(7.1)	(0.5)
Goodwill, Foreign currency translation	(168.7)	(18.5)
Goodwill, Balance June 30	8,707.7	8,599.6
Goodwill, impairment losses	0
Goodwill, accumulated impairment losses	0
Goodwill, acquisitions of noncontrolling interests	5.8	8.0
Purchased and internally developed software
Intangible assets:, Gross Carrying Value	282.3		283.3
Intangible assets:, Accumulated Amortization	222.9		218.8
Intangible assets:, Net Carrying Value	59.4		64.5
Customer related and other
Intangible assets:, Gross Carrying Value	654.9		670.8
Intangible assets:, Accumulated Amortization	306.9		279.2
Intangible assets:, Net Carrying Value	$ 348.0		$ 391.6

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Operating Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Salary and service costs	$ 2,598.8	$ 2,541.3	$ 5,132.3	$ 4,975.8
Office and general expenses	515.2	513.3	1,008.8	1,023.5
Operating expenses	$ 3,114.0	$ 3,054.6	$ 6,141.1	$ 5,999.3

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 30.3	$ 35.9
Accumulated depreciation	1,217.5	1,234.8
Intangible assets, accumulated amortization	$ 529.8	$ 498.0

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Taxes [Abstract]

Income Taxes

Income Taxes

Our effective tax rate for the six months ended June 30, 2013 and 2012 was 33.5% and 33.7%, respectively.

In connection with the conversion of our 2033 Notes and 2038 Notes, we reclassified $52.7 million, representing the excess of the accreted value of the notes for income tax purposes over the conversion value, from long-term deferred tax liability to current taxes payable. In addition, we reclassified $34.5 million, representing the difference between the issue price of the notes and the conversion value, from long-term deferred tax liability to additional paid-in capital. We expect that the tax liability resulting from the conversion of the notes will be paid in the third and fourth quarters of 2013.

At June 30, 2013, our unrecognized tax benefits were $139.6 million. Of this amount, approximately $60.9 million would affect our effective tax rate upon resolution of the uncertain tax positions.

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income	$ 321.6	$ 314.2	$ 546.5	$ 540.2
Unrealized gain on available-for-sale securities, net of income taxes of $0.1 for the three months and $0.2 for the six months ended June 30, 2013	0.1	0	0.3	0
Foreign currency translation adjustment, net of income taxes of ($63.5) and ($66.2) for the three months and ($158.0) and ($16.4) for the six months ended June 30, 2013 and 2012, respectively	(123.3)	(128.5)	(306.6)	(31.8)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $1.1 and $0.9 for the three months and $2.4 and $1.6 for the six months ended June 30, 2013 and 2012, respectively	1.7	1.3	3.4	2.4
Other Comprehensive Income	(121.5)	(127.2)	(302.9)	(29.4)
Comprehensive Income	200.1	187.0	243.6	510.8
Less: Comprehensive Income attributed to noncontrolling interests	7.6	24.4	16.8	48.0
Comprehensive Income - Omnicom Group Inc.	$ 192.5	$ 162.6	$ 226.8	$ 462.8

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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 1,399.9	$ 2,678.3
Short-term investments, at cost	14.7	20.6
Accounts receivable, net of allowance for doubtful accounts of $30.3 and $35.9	6,637.0	6,958.2
Work in process	1,258.1	1,008.4
Other current assets	978.5	995.9
Total Current Assets	10,288.2	11,661.4
Property and Equipment at cost, less accumulated depreciation of $1,217.5 and $1,234.8	687.1	723.8
Equity Method Investments	147.4	155.2
Goodwill	8,707.7	8,844.2
Intangible Assets, net of accumulated amortization of $529.8 and $498.0	407.4	456.1
Other Assets	287.2	311.2
TOTAL ASSETS	20,525.0	22,151.9
Current Liabilities:
Accounts payable	7,797.7	8,296.7
Customer advances	1,204.7	1,231.5
Current portion of debt	0.3	0.4
Short-term borrowings	12.8	6.4
Taxes payable	197.4	264.4
Other current liabilities	2,014.2	2,076.4
Total Current Liabilities	11,227.1	11,875.8
Long-Term Notes Payable	3,784.8	3,789.1
Convertible Debt	252.7	659.4
Long-Term Liabilities	689.5	739.9
Long-Term Deferred Tax Liabilities	864.9	933.0
Temporary Equity - Redeemable Noncontrolling Interests	196.7	198.4
Shareholders’ Equity:
Preferred stock	0	0
Common stock	59.6	59.6
Additional paid-in capital	804.7	836.6
Retained earnings	8,676.5	8,394.4
Accumulated other comprehensive income (loss)	(397.4)	(129.5)
Treasury stock, at cost	(6,087.7)	(5,700.3)
Total Shareholders’ Equity	3,055.7	3,460.8
Noncontrolling interests	453.6	495.5
Total Equity	3,509.3	3,956.3
TOTAL LIABILITIES AND EQUITY	$ 20,525.0	$ 22,151.9

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Fair Value (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value [Abstract]

Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and liabilities measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 were (in millions):

June 30, 2013	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents	$	1,399.9					$	1,399.9
Short-term investments	14.7						14.7
Available-for-sale securities	4.5						4.5
Forward foreign exchange contracts			$	0.5			0.5
Liabilities:
Forward foreign exchange contracts			$	0.7			$	0.7
Contingent purchase price obligations					$	232.2	232.2

December 31, 2012	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents	$	2,678.3					$	2,678.3
Short-term investments	20.6						20.6
Available-for-sale securities	3.9						3.9
Forward foreign exchange contracts			$	0.5			0.5
Liabilities:
Contingent purchase price obligations					$	266.2	$	266.2

Carrying Amounts and Fair Value of Financial Instruments

The carrying amount and fair value of our financial instruments at June 30, 2013 and December 31, 2012 were (in millions):

	2013				2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	$	1,399.9	$	1,399.9	$	2,678.3	$	2,678.3
Short-term investments	14.7		14.7		20.6		20.6
Forward foreign exchange contracts	0.5		0.5		0.5		0.5
Available-for-sale securities	4.5		4.5		3.9		3.9
Cost method investments	22.5		22.5		23.1		23.1
Liabilities:
Short-term borrowings	$	12.8	$	12.8	$	6.4	$	6.4
Forward foreign exchange contracts	0.7		0.7		—		—
Contingent purchase price obligations	232.2		232.2		266.2		266.2
Debt	4,037.8		4,252.8		4,448.9		4,857.3

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Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

	2013						2012
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Goodwill	$	9,274.0	$	566.3	$	8,707.7	$	9,424.3	$	580.1	$	8,844.2
Intangible assets:
Purchased and internally developed software	$	282.3	$	222.9	$	59.4	$	283.3	$	218.8	$	64.5
Customer related and other	654.9		306.9		348.0		670.8		279.2		391.6
	$	937.2	$	529.8	$	407.4	$	954.1	$	498.0	$	456.1

Changes in Goodwill

Change in goodwill for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
Balance January 1	$	8,844.2		$	8,456.3
Acquisitions	39.3			162.3
Dispositions	(7.1		)	(0.5		)
Foreign currency translation	(168.7		)	(18.5		)
Balance June 30	$	8,707.7		$	8,599.6

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Fair Value (Details) (USD $) In Millions, unless otherwise specified															6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Carrying Amount	Dec. 31, 2012 Carrying Amount	Jun. 30, 2013 Fair Value	Dec. 31, 2012 Fair Value	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 1	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 2	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 2	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 3	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Total	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Total	Jun. 30, 2013 Contingent Purchase Price Obligations [Member]
Assets:
Cash and cash equivalents			$ 1,399.9	$ 2,678.3	$ 1,399.9	$ 2,678.3	$ 1,399.9	$ 2,678.3					$ 1,399.9	$ 2,678.3
Short-term investments	14.7	20.6	14.7	20.6	14.7	20.6	14.7	20.6					14.7	20.6
Forward foreign exchange contracts			0.5	0.5	0.5	0.5			0.5	0.5			0.5	0.5
Available-for-sale securities			4.5	3.9	4.5	3.9	4.5	3.9					4.5	3.9
Cost method investments			22.5	23.1	22.5	23.1
Liabilities:
Short-term borrowings			12.8	6.4	12.8	6.4
Forward foreign exchange contracts			0.7	0	0.7	0			0.7				0.7
Contingent purchase price obligations			232.2	266.2	232.2	266.2					232.2	266.2	232.2	266.2
Debt			4,037.8	4,448.9	4,252.8	4,857.3
Changes in contingent purchase price obligations, payments															$ 31.8

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012
Effective income tax rate		33.50%	33.70%
Current Taxes Payable, Conversion of Debt	$ 52.7
Adjustment to Additional Paid-In Capital, Conversion of Debt	34.5	34.5
Unrecognized tax benefits	139.6	139.6
Unrecognized tax benefits that would impact effective tax rate	$ 60.9	$ 60.9

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Pension and Other Postemployment Benefits (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Pension Plans [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 2.4	$ 3.0
Interest cost	3.0	2.9
Expected return on plan assets	(1.3)	(1.2)
Amortization of prior service cost	1.6	1.6
Amortization of actuarial (gains) losses	2.3	0.7
Net periodic benefit cost	8.0	7.0
Defined benefit pension plans, contributions by employer	2.4	4.6
Postemployment Arrangements [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	2.2	2.0
Interest cost	2.0	2.3
Amortization of prior service cost	1.0	1.0
Amortization of actuarial (gains) losses	0.9	0.4
Net periodic benefit cost	$ 6.1	$ 5.7

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Segment Reporting

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

Our wholly and partially owned agencies operate within the advertising, marketing and corporate communications services industry. These agencies are organized into agency networks, virtual client networks, regional reporting units and operating groups. Consistent with our fundamental business strategy, our agencies serve similar clients, in similar industries and, in many cases, the same clients across a variety of geographic regions. In addition, our agency networks have similar economic characteristics including similar costs and long-term profit contribution. The main economic components of each agency are employee compensation and related costs and direct service costs and office and general costs, which include rent and occupancy costs, technology costs and other overhead expenses. Therefore, given these similarities, we aggregate our operating segments, which are our five agency networks, into one reporting segment.

Revenue and long-lived assets and goodwill by geographic area as of and for the periods ended June 30, 2013 and 2012 were (in millions):

	Americas		EMEA		Asia Pacific
2013
Revenue - Three months ended	$	2,160.7	$	1,086.6	$	389.7
Revenue - Six months ended	4,197.9		2,087.8		750.2
Long-lived assets and goodwill	6,062.7		2,759.3		572.8
2012
Revenue - Three months ended	$	2,111.4	$	1,071.0	$	378.6
Revenue - Six months ended	4,070.7		2,065.6		731.9
Long-lived assets and goodwill	6,053.2		2,665.3		579.3

The Americas is composed of the United States, Canada and Latin American countries. EMEA is composed of various Euro currency countries, the United Kingdom, other European countries that have not adopted the European Union Monetary standard, the Middle-East and Africa. Asia Pacific is composed of Australia, China, India, Japan, Korea, New Zealand, Singapore and other Asian countries.

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Changes in Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

Changes in Accumulated Other Comprehensive Income (Loss) [Abstract]

Changes in accumulated other comprehensive income (loss)

The changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2013 were (in millions):

	Unrealized Gain and (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
Balance January 1	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
Other comprehensive income before reclassifications	0.3			—			(271.6		)	(271.3		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			3.4			—			3.4
Other comprehensive income	0.3			3.4			(271.6		)	(267.9		)
Balance June 30	$	(1.7	)	$	(86.4	)	$	(309.3	)	$	(397.4	)

Reclassifications from accumulated other comprehensive income (loss)

Reclassifications from accumulated other comprehensive income (loss) for the six months ended June 30, 2013 were (in millions):

Amortization of defined benefit pension and postemployment plans:
Prior service cost	$	2.6
Actuarial (gains) losses	3.2
Net periodic benefit cost (see Note 8)	5.8
Income tax expense	2.4
Net of tax	$	3.4

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Operating Expenses

6 Months Ended

Jun. 30, 2013

Operating Expenses [Abstract]

Operating Expenses

Operating Expenses

Operating expenses for the three and six months ended June 30, 2013 and 2012 were (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Salary and service costs	$	2,598.8	$	2,541.3	$	5,132.3	$	4,975.8
Office and general expenses	515.2		513.3		1,008.8		1,023.5
Operating expenses	$	3,114.0	$	3,054.6	$	6,141.1	$	5,999.3

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Debt

6 Months Ended

Jun. 30, 2013

Debt [Abstract]

Debt

Debt

Lines of Credit

We have committed and uncommitted lines of credit. We have a $2.5 billion committed line of credit ("Credit Agreement") with a consortium of banks expiring on October 12, 2016. We have the ability to classify borrowings under the Credit Agreement as long-term. The Credit Agreement supports the issuance of up to $1.5 billion of commercial paper. Commercial paper issuances reduce the amount available under the Credit Agreement. At June 30, 2013, there were no outstanding commercial paper issuances or borrowings under the Credit Agreement. At June 30, 2013 and December 31, 2012, we had various uncommitted lines of credit aggregating $970.9 million and $878.2 million, respectively.

Our available and unused lines of credit at June 30, 2013 and December 31, 2012 were (in millions):

	2013		2012
Credit Agreement	$	2,500.0	$	2,500.0
Uncommitted lines of credit	970.9		878.2
Available and unused lines of credit	$	3,470.9	$	3,378.2

The Credit Agreement contains financial covenants that restrict our ability to incur indebtedness as defined in the agreement. These financial covenants limit the Leverage Ratio of total consolidated indebtedness to total consolidated EBITDA to no more than 3 times for the most recently ended 12 month period (under the Credit Agreement, EBITDA is defined as earnings before interest, taxes, depreciation and amortization). We are also required to maintain a minimum Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5 times for the most recently ended 12 month period.At June 30, 2013 we were in compliance with these covenants, as our Leverage Ratio was 1.9 times and our Interest Coverage Ratio was 10.8 times. The Credit Agreement does not limit our ability to declare or pay dividends.

Short-Term Borrowings

Short-term borrowings of $12.8 million and $6.4 million at June 30, 2013 and December 31, 2012, respectively, represent bank overdrafts and credit lines of our international subsidiaries. The bank overdrafts and credit lines are treated as unsecured loans pursuant to the agreements supporting the facilities. Due to the short-term nature of these instruments, carrying value approximates fair value.

Long-Term Notes Payable

Long-term notes payable at June 30, 2013 and December 31, 2012 were (in millions):

	2013		2012
5.90% Senior Notes due April 15, 2016	$	1,000.0	$	1,000.0
6.25% Senior Notes due July 15, 2019	500.0		500.0
4.45% Senior Notes due August 15, 2020	1,000.0		1,000.0
3.625% Senior Notes due May 1, 2022	1,250.0		1,250.0
Other notes and loans	0.3		0.4
	3,750.3		3,750.4
Unamortized premium (discount) on Senior Notes, net	15.3		16.0
Deferred gain from termination of interest rate swaps on Senior Notes due 2016	19.5		23.1
	3,785.1		3,789.5
Less current portion	0.3		0.4
Long-term notes payable	$	3,784.8	$	3,789.1

Convertible Debt

Convertible debt at June 30, 2013 and December 31, 2012 was (in millions):

	2013		2012
Convertible Notes due July 31, 2032	$	252.7	$	252.7
Convertible Notes due June 15, 2033	—		0.1
Convertible Notes due July 1, 2038	—		406.6
	252.7		659.4
Less current portion	—		—
Convertible debt	$	252.7	$	659.4

On May 16, 2013, we called our Convertible Notes due June 15, 2033 (“2033 Notes”) and our Convertible Notes due July 1, 2038 (“2038 Notes”) for redemption on June 17, 2013 at a redemption price of 100% of the principal amount. As provided in the indenture governing the 2033 Notes and the 2038 Notes, prior to redemption the noteholders had the right to convert their notes into shares of our common stock at a conversion rate of 19.4174 shares per $1,000 principal amount at any time prior to June 13, 2013. Substantially all the noteholders exercised their conversion right. We paid $406.1 million in cash representing the principal amount of the 2033 Notes and 2038 Notes that were converted and issued 1,499,792 shares of our common stock to satisfy the conversion premium. On June 17, 2013, we paid $0.6 million to redeem the remaining 2033 Notes and 2038 Notes that were not converted.

On July 31, 2013, the holders of our Convertible Notes due July 31, 2032 can put their notes back to us for cash.

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Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net Income	$ 546.5	$ 540.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	91.3	90.8
Amortization of intangible assets	50.6	47.9
Amortization of deferred gain from termination of interest rate swaps	(3.6)	(3.7)
Income from equity method investments, net of dividends received	0.7	(0.3)
Provision for doubtful accounts	0.8	2.3
Share-based compensation	44.7	44.4
Excess tax benefit from share-based compensation	(28.8)	(57.5)
Change in operating capital	(635.7)	(506.8)
Net Cash Provided By Operating Activities	66.5	157.3
Cash Flows from Investing Activities:
Payments to acquire property and equipment	(69.0)	(112.8)
Payments to acquire businesses and interests in affiliates, net of cash acquired	(22.2)	(105.2)
Proceeds from investments	13.9	8.9
Net Cash Used In Investing Activities	(77.3)	(209.1)
Cash Flows from Financing Activities:
Proceeds from short-term debt	6.9	2.9
Proceeds from borrowings	0	746.8
Redemption of convertible debt	(406.7)	0
Payments of dividends	(106.7)	(153.5)
Payments for repurchase of common stock	(556.1)	(805.9)
Proceeds from stock plans	35.0	177.6
Payments for acquisition of additional noncontrolling interests	(5.4)	(2.6)
Payments of dividends to noncontrolling interest shareholders	(59.9)	(56.8)
Payments of contingent purchase price obligations	(31.8)	(5.4)
Excess tax benefit on share-based compensation	28.8	57.5
Other, net	(18.0)	(15.9)
Net Cash Used In Financing Activities	(1,113.9)	(55.3)
Effect of exchange rate changes on cash and cash equivalents	(153.7)	(8.8)
Net Decrease in Cash and Cash Equivalents	(1,278.4)	(115.9)
Cash and Cash Equivalents at the Beginning of the Period	2,678.3	1,781.2
Cash and Cash Equivalents at the End of the Period	$ 1,399.9	$ 1,665.3

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Debt (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Lines of Credit [Abstract]
Available and unused lines of credit	$ 3,470,900,000	$ 3,470,900,000		$ 3,378,200,000
Short-Term Borrowings [Abstract]
Short-term borrowings	12,800,000	12,800,000		6,400,000
Long-Term Notes Payable [Abstract]
Long-term notes payable, carrying amount	3,750,300,000	3,750,300,000		3,750,400,000
Unamortized premium (discount) on Senior Notes, net	15,300,000	15,300,000		16,000,000
Deferred gain from termination of interest rate swaps on Senior Notes due 2016	19,500,000	19,500,000		23,100,000
Long-term notes payable, total	3,785,100,000	3,785,100,000		3,789,500,000
Long-term notes payable, current portion	300,000	300,000		400,000
Long-Term Notes Payable	3,784,800,000	3,784,800,000		3,789,100,000
Long-term notes payable, proceeds from issuance of long-term notes payable		0	746,800,000
Convertible Debt [Abstract]
Convertible debt, total	252,700,000	252,700,000		659,400,000
Convertible debt, current	0	0		0
Convertible Debt	252,700,000	252,700,000		659,400,000
Long-Term Notes Payable and Convertible Debt [Abstract]
Convertible Debt, Call Date	May 16, 2013
Convertible Debt, Percentage of Principal Amount Redeemed	100.00%
Convertible Debt, Conversion Rate	19.4174
Convertible Debt, Latest Conversion Date	Jun. 13, 2013
Convertible Debt, Principle Amount Settled in Cash	406,100,000
Convertible Debt, Shares Issued for Conversion Premium	1,499,792	1,499,792
Convertible Debt, Repurchase Date	Jun. 17, 2013
Convertible Debt, Repurchase Amount	600,000	600,000
Credit Agreement expiring October 2016 [Member]
Lines of Credit [Abstract]
Credit Agreement, maximum borrowing capacity	2,500,000,000	2,500,000,000
Credit Agreement, expiration date		Oct. 12, 2016
Available and unused lines of credit	2,500,000,000	2,500,000,000		2,500,000,000
Credit Agreement, covenant terms		The Credit Agreement contains financial covenants that restrict our ability to incur indebtedness as defined in the agreement. These financial covenants limit the Leverage Ratio of total consolidated indebtedness to total consolidated EBITDA to no more than 3 times for the most recently ended 12 month period (under the Credit Agreement, EBITDA is defined as earnings before interest, taxes, depreciation and amortization). We are also required to maintain a minimum Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5 times for the most recently ended 12 month period.
Credit Agreement, covenant compliance		At June 30, 2013 we were in compliance with these covenants, as our Leverage Ratio was 1.9 times and our Interest Coverage Ratio was 10.8 times.
Credit Agreement expiring October 2016 [Member] | Commercial Paper [Member]
Lines of Credit [Abstract]
Credit Agreement, maximum borrowing capacity	1,500,000,000	1,500,000,000
Uncommitted lines of credit [Member]
Lines of Credit [Abstract]
Available and unused lines of credit	970,900,000	970,900,000		878,200,000
5.90% Senior Notes due April 15, 2016
Long-Term Notes Payable [Abstract]
Long-term notes payable, carrying amount	1,000,000,000	1,000,000,000		1,000,000,000
Long-Term Notes Payable and Convertible Debt [Abstract]
Interest rate	5.90%	5.90%
Maturity date		Apr. 15, 2016
6.25% Senior Notes due July 15, 2019
Long-Term Notes Payable [Abstract]
Long-term notes payable, carrying amount	500,000,000	500,000,000		500,000,000
Long-Term Notes Payable and Convertible Debt [Abstract]
Interest rate	6.25%	6.25%
Maturity date		Jul. 15, 2019
4.45% Senior Notes due August 15, 2020
Long-Term Notes Payable [Abstract]
Long-term notes payable, carrying amount	1,000,000,000	1,000,000,000		1,000,000,000
Long-Term Notes Payable and Convertible Debt [Abstract]
Interest rate	4.45%	4.45%
Maturity date		Aug. 15, 2020
3.625% Senior Notes due May 1, 2022
Long-Term Notes Payable [Abstract]
Long-term notes payable, carrying amount	1,250,000,000	1,250,000,000		1,250,000,000
Long-Term Notes Payable and Convertible Debt [Abstract]
Interest rate	3.625%	3.625%
Maturity date		May 01, 2022
Other notes and loans
Long-Term Notes Payable [Abstract]
Long-term notes payable, carrying amount	300,000	300,000		400,000
Convertible Notes due July 31, 2032
Convertible Debt [Abstract]
Convertible debt, total	252,700,000	252,700,000		252,700,000
Long-Term Notes Payable and Convertible Debt [Abstract]
Interest rate	0.00%	0.00%
Maturity date		Jul. 31, 2032
Convertible Notes due June 15, 2033
Convertible Debt [Abstract]
Convertible debt, total	0	0		100,000
Convertible Notes due July 1, 2038
Convertible Debt [Abstract]
Convertible debt, total	$ 0	$ 0		$ 406,600,000

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Fair Value

6 Months Ended

Jun. 30, 2013

Fair Value [Abstract]

Fair Value

Fair Value

Financial assets and liabilities measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 were (in millions):

June 30, 2013	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents	$	1,399.9					$	1,399.9
Short-term investments	14.7						14.7
Available-for-sale securities	4.5						4.5
Forward foreign exchange contracts			$	0.5			0.5
Liabilities:
Forward foreign exchange contracts			$	0.7			$	0.7
Contingent purchase price obligations					$	232.2	232.2

December 31, 2012	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents	$	2,678.3					$	2,678.3
Short-term investments	20.6						20.6
Available-for-sale securities	3.9						3.9
Forward foreign exchange contracts			$	0.5			0.5
Liabilities:
Contingent purchase price obligations					$	266.2	$	266.2

The reduction in Level 3 contingent purchase price obligations from $266.2 million at December 31, 2012 to $232.2 million at June 30, 2013 resulted primarily from payments of $31.8 million.

The carrying amount and fair value of our financial instruments at June 30, 2013 and December 31, 2012 were (in millions):

	2013				2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	$	1,399.9	$	1,399.9	$	2,678.3	$	2,678.3
Short-term investments	14.7		14.7		20.6		20.6
Forward foreign exchange contracts	0.5		0.5		0.5		0.5
Available-for-sale securities	4.5		4.5		3.9		3.9
Cost method investments	22.5		22.5		23.1		23.1
Liabilities:
Short-term borrowings	$	12.8	$	12.8	$	6.4	$	6.4
Forward foreign exchange contracts	0.7		0.7		—		—
Contingent purchase price obligations	232.2		232.2		266.2		266.2
Debt	4,037.8		4,252.8		4,448.9		4,857.3

The estimated fair value of derivative positions in forward foreign exchange contracts is determined using model-derived valuations, taking into consideration market rates and counterparty credit risk. The estimated fair value of the contingent purchase price obligation is calculated in accordance with the terms of each acquisition agreement and are appropriately discounted. The fair value of debt is based on quoted market prices.

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Pension and Other Postemployment Benefits

6 Months Ended

Jun. 30, 2013

Pension and Other Postemployment Benefits [Abstract]

Pension and Other Postemployment Benefits

Pension and Other Postemployment Benefits

Defined Benefit Pension Plans

The components of net periodic benefit cost for the six months ended June 30, 2013 and 2012 were (in millions):

	2013			2012
Service cost	$	2.4		$	3.0
Interest cost	3.0			2.9
Expected return on plan assets	(1.3		)	(1.2		)
Amortization of prior service cost	1.6			1.6
Amortization of actuarial (gains) losses	2.3			0.7
	$	8.0		$	7.0

We contributed $2.4 million and $4.6 million to our defined benefit pension plans in the six months ended June 30, 2013 and 2012, respectively.

Postemployment Arrangements

The components of net periodic benefit cost for the six months ended June 30, 2013 and 2012 were (in millions):

	2013		2012
Service cost	$	2.2	$	2.0
Interest cost	2.0		2.3
Amortization of prior service cost	1.0		1.0
Amortization of actuarial (gains) losses	0.9		0.4
	$	6.1	$	5.7

Net periodic benefit cost is included in the salary and service costs component of operating expenses.

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Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2013

Net Income per Common Share [Abstract]

Computations of Basic and Diluted Net Income per Common Share - Omnicom Group Inc.

The computation of basic and diluted net income per common share for the three and six months ended June 30, 2013 and 2012 is (in millions, except per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Net Income Available for Common Shares:
Net income - Omnicom Group Inc.	$	289.5		$	282.7		$	494.7		$	487.3
Net income allocated to participating securities	(7.8		)	(6.4		)	(13.4		)	(10.9		)
	$	281.7		$	276.3		$	481.3		$	476.4
Weighted Average Shares:
Basic	257.7			269.0			259.4			271.2
Dilutive stock options and restricted shares and shares issuable for the conversion value of convertible debt	1.5			2.8			1.3			2.7
Diluted	259.2			271.8			260.7			273.9
Anti-dilutive stock options and restricted shares	0.1			0.2			0.1			0.3
Net Income per Common Share - Omnicom Group Inc.:
Basic	$	1.09		$	1.03		$	1.86		$	1.76
Diluted	$	1.09		$	1.02		$	1.85		$	1.74

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Changes in Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2013

Changes in Accumulated Other Comprehensive Income (Loss) [Abstract]

Changes in Accumulated Other Comprehensive Income (Loss)

Changes in Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2013 were (in millions):

	Unrealized Gain and (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
Balance January 1	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
Other comprehensive income before reclassifications	0.3			—			(271.6		)	(271.3		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			3.4			—			3.4
Other comprehensive income	0.3			3.4			(271.6		)	(267.9		)
Balance June 30	$	(1.7	)	$	(86.4	)	$	(309.3	)	$	(397.4	)

Reclassifications from accumulated other comprehensive income (loss) for the six months ended June 30, 2013 were (in millions):

Amortization of defined benefit pension and postemployment plans:
Prior service cost	$	2.6
Actuarial (gains) losses	3.2
Net periodic benefit cost (see Note 8)	5.8
Income tax expense	2.4
Net of tax	$	3.4

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Document and Entity Information Document	6 Months Ended
	Jun. 30, 2013	Jul. 15, 2013
Entity Information [Line Items]
Entity Registrant Name	OMNICOM GROUP INC.
Entity Central Index Key	0000029989
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		257,192,964

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Subsequent Events

6 Months Ended

Jun. 30, 2013

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

We have evaluated events subsequent to the balance sheet date and determined there have not been any events that have occurred that would require adjustment to or disclosure in our unaudited condensed consolidated financial statements.