Omnicom (OMC) 10-Q 22 Apr 14 2013 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 15, 2014
Document 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	31-Mar-14	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q1	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	258,440,800

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$2,082.10	$2,710.50
Short-term investments, at cost	7	18.2
Accounts receivable, net of allowance for doubtful accounts of $30.7 and $32.6	6,006.60	6,632.60
Work in process	1,488.60	1,288
Other current assets	992.3	1,003
Total Current Assets	10,576.60	11,652.30
Property and Equipment at cost, less accumulated depreciation of $1,255.4 and $1,230.1	732	737.4
Equity Method Investments	133.5	131.8
Goodwill	8,986.70	8,916
Intangible Assets, net of accumulated amortization of $577.5 and $552.3	384.7	386
Other Assets	274.4	275.2
TOTAL ASSETS	21,087.90	22,098.70
Current Liabilities:	'	'
Accounts payable	7,403.40	8,358.90
Customer advances	1,153.60	1,242.20
Current portion of debt	253.1	0.4
Short-term borrowings	7.5	5.9
Taxes payable	221.9	293.3
Other current liabilities	2,408.80	2,377
Total Current Liabilities	11,448.30	12,277.70
Long-Term Notes Payable	3,778.60	3,780.70
Convertible Debt	0	252.7
Long-Term Liabilities	713	685.1
Long-Term Deferred Tax Liabilities	740.8	832.6
Commitments and Contingent Liabilities (See Note 12)	'	'
Temporary Equity - Redeemable Noncontrolling Interests	200.9	202
Shareholders’ Equity:	'	'
Preferred stock	0	0
Common stock	59.6	59.6
Additional paid-in capital	847.8	817.1
Retained earnings	9,060.80	8,961.20
Accumulated other comprehensive income (loss)	-169.7	-191.6
Treasury stock, at cost	-6,080	-6,063.90
Total Shareholders’ Equity	3,718.50	3,582.40
Noncontrolling interests	487.8	485.5
Total Equity	4,206.30	4,067.90
TOTAL LIABILITIES AND EQUITY	$21,087.90	$22,098.70

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Allowance for doubtful accounts	$30.70	$32.60
Accumulated depreciation	1,255.40	1,230.10
Intangible assets, accumulated amortization	$577.50	$552.30

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$3,502.20	$3,398.90
Operating Expenses	3,119.50	3,027.20
Operating Income	382.7	371.7
Interest Expense	47.7	49
Interest Income	8.7	8.1
Income Before Income Taxes and Income From Equity Method Investments	343.7	330.8
Income Tax Expense	116.3	109.2
Income From Equity Method Investments	0.6	3.2
Net Income	228	224.8
Net Income Attributed To Noncontrolling Interests	-22.5	-19.7
Net Income - Omnicom Group Inc.	$205.50	$205.10
Net Income Per Share - Omnicom Group Inc.:	'	'
Basic	$0.78	$0.76
Diluted	$0.77	$0.76
Dividends Declared Per Common Share	$0.40	$0.40

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net Income	$228	$224.80
Unrealized gain (loss) on available-for-sale securities, net of income taxes of $0.1 and $0.1 for the three months ended March 31, 2014 and 2013, respectively	0.1	0.2
Foreign currency translation adjustment, net of income taxes of $15.6 and ($94.5) for the three months ended March 31, 2014 and 2013, respectively	30.2	-183.3
Defined benefit pension and postemployment plans adjustment, net of income taxes of $0.9 and $1.3 for the three months ended March 31, 2014 and 2013, respectively	1.4	1.7
Other Comprehensive Income	31.7	-181.4
Comprehensive Income	259.7	43.4
Comprehensive Income Attributed to Noncontrolling Interests	-32.3	-9.2
Comprehensive Income - Omnicom Group Inc.	$227.40	$34.20

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Unrealized gain (loss) on available-for-sale securities, income taxes	$0.10	$0.10
Foreign currency translation adjustment, income taxes	15.6	-94.5
Defined benefit pension and postemployment plans adjustment, income taxes	$0.90	$1.30

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:	'	'
Net Income	$228	$224.80
Adjustments to reconcile net income to net cash used in operating activities:	'	'
Depreciation	46.5	45.7
Amortization of intangible assets	24.4	25.4
Amortization of deferred gain from termination of interest rate swaps	-1.8	-1.8
Income from equity method investments, net of dividends received	1.5	-0.9
Provision for doubtful accounts	0.6	-0.4
Share-based compensation	21.6	22.1
Excess tax benefit from share-based compensation	-8.8	-12.8
Change in operating capital	-742.3	-511.8
Net Cash Used In Operating Activities	-430.3	-209.7
Cash Flows from Investing Activities:	'	'
Payments to acquire property and equipment	-42.5	-38.2
Payments to acquire businesses and interests in affiliates, net of cash acquired	-11.9	-0.9
Proceeds from investments, net	11.9	2.7
Net Cash Used In Investing Activities	-42.5	-36.4
Cash Flows from Financing Activities:	'	'
Proceeds from short-term debt	1.7	5.4
Payments of dividends	-105.9	0
Payments for repurchases of common stock	-22.1	-273.5
Proceeds from stock plans	4.8	22.4
Payments for acquisition of additional noncontrolling interests	-8.4	-5.6
Payments of dividends to noncontrolling interest shareholders	-24.8	-23
Payments of contingent purchase price obligations	-7.8	-13.5
Excess tax benefit from share-based compensation	8.8	12.8
Other, net	-3.2	-9.3
Net Cash Used In Financing Activities	-156.9	-284.3
Effect of foreign exchange rate changes on cash and cash equivalents	1.3	-76.1
Net Decrease in Cash and Cash Equivalents	-628.4	-606.5
Cash and Cash Equivalents at the Beginning of Period	2,710.50	2,678.30
Cash and Cash Equivalents at the End of Period	$2,082.10	$2,071.80

Presentation_of_Financial_Stat

Presentation of Financial Statements	3 Months Ended
	Mar. 31, 2014
Presentation of Financial Statements [Abstract]	'
Presentation of Financial Statements	'
	Presentation of Financial Statements
	The terms “Omnicom,” “the Company,” “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, 2013 (“2013 Form 10-K”). Results for the interim periods are not necessarily indicative of results that may be expected for the year.

Pending_Business_Combination

Pending Business Combination	3 Months Ended
	Mar. 31, 2014
Pending Business Combination [Abstract]	'
Pending Business Combination	'
	Pending Business Combination
	On July 27, 2013, the Company and Publicis Groupe S.A. (“Publicis”) entered into a Business Combination Agreement (the “Business Combination Agreement”) pursuant to which the Company and Publicis agreed, subject to the terms and conditions of the Business Combination Agreement, to combine their respective businesses (the “Business Combination”). In the Business Combination, Publicis will merge (the “Publicis Merger”) with and into Publicis Omnicom Group N.V., a newly-formed Dutch holding company (“Publicis Omnicom Group” or “HoldCo”), with Publicis Omnicom Group being the surviving entity in the Publicis Merger, and immediately after consummation of the Publicis Merger, a corporation wholly-owned by Publicis Omnicom Group will merge (the “Omnicom Merger” and together with the Publicis Merger, the “Mergers”) with and into the Company, with the Company being the surviving corporation in the Omnicom Merger.
	In the Publicis Merger, each issued and outstanding share of Publicis will be exchanged for 1.000000 ordinary share of Publicis Omnicom Group. In addition, prior to completion of the Publicis Merger, Publicis intends to declare and pay a special dividend, in cash, in an amount equal to €1.00 per Publicis share (the “Publicis Transaction Dividend”). In the Omnicom Merger, each share of common stock of the Company will be converted into the right to receive 0.813008 of a Publicis Omnicom Group ordinary share, together with cash in lieu of fractional shares, subject to adjustment to account for certain changes in outstanding shares and certain excluded asset values as set forth in the Business Combination Agreement. Similarly, prior to completion of the Omnicom Merger, the Company intends to declare and pay a special cash dividend of $2.00 per share of the Company’s outstanding common stock (the “Omnicom Transaction Dividend” and, together with the Publicis Transaction Dividend, the “Transaction Dividends”), subject to adjustment to account for certain changes in outstanding shares of the parties and certain excluded asset values, in each case as set forth in the Business Combination Agreement, and, if necessary, to equalize the cumulative amount of regular dividends paid by the Company after July 27, 2013 with the cumulative amount of regular Publicis dividends paid after July 27, 2013. However, dividends of up to $0.80 per share in the aggregate paid to holders of the Company's common stock in respect of record dates after July 27, 2013 and before the Mergers are not included in this equalization. The payment of the Transaction Dividends is also subject to applicable law.
	Completion of the transactions contemplated by the Business Combination Agreement (which include the Mergers, the Publicis Transaction Dividend, and the Omnicom Transaction Dividend, collectively, the “Transactions”) will require resolution of all open issues, complexities and challenges and will be subject to the satisfaction or waiver, if legally permitted, of certain conditions including (a) approval and adoption of the Business Combination Agreement and the Omnicom Merger by the holders of two-thirds of the outstanding shares of common stock of the Company, approval of the Cross-Border Merger Terms (as described in the Business Combination Agreement), and the Publicis Merger by the holders of two-thirds of the voting rights attached to the Publicis shares present at a meeting of the Publicis shareholders, and the approval of the Publicis Transaction Dividend by the holders of a majority of the voting rights attached to the Publicis shares present at a meeting of the Publicis shareholders; (b) approval by requisite governmental regulators and authorities, including approvals under applicable competition laws; (c) the listing of the Publicis Omnicom Group ordinary shares on applicable stock exchanges; (d) the absence of any law or order prohibiting the completion of the Transactions; (e) the performance and compliance in all material respects by HoldCo and the other parties with all obligations under the Business Combination Agreement; and (f) the absence of a material adverse effect on either the Company or Publicis.
	In connection with pending merger control approval in China, effective April 17, 2014 the parties are entering an extended review period (Phase III).
	In addition, the parties have made applications with various tax authorities for the purpose of establishing the intended tax treatment for Publicis Omnicom Group. To date, the parties’ applications have not yet resulted in the requisite agreements, rulings or acknowledgements from the relevant tax authorities. The parties have jointly applied to the Dutch Ministry of Finance and the United Kingdom's HM Revenue & Customs to establish exclusive tax residency in the United Kingdom for Publicis Omnicom Group under the mutual agreement procedure (“MAP”) pursuant to the United Kingdom/Netherlands double tax agreement. To date, the parties’ application has not resulted in the agreement of the competent authorities that is required to establish such exclusive tax residency. The ultimate failure to obtain the agreements, rulings or acknowledgments of the various tax authorities, including the inability to establish exclusive United Kingdom tax residency and any conditions established by the competent authorities under a MAP, may adversely affect the tax treatment and the expected benefits of the proposed combination and also could adversely affect the likelihood of satisfying certain of the conditions necessary to complete the combination under the Business Combination Agreement.
	It is not practicable at this time to predict the exact timing of when completion of the Transactions may occur. Upon completion, the Transactions contemplated by the Business Combination Agreement would have a material effect on our future results of operations and financial position.

New_Accounting_Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2014
New Accounting Standards [Abstract]	'
New Accounting Standards	'
	New Accounting Standards
	On January 1, 2014 we adopted FASB ASU 2013-05, Foreign Currency Matters (Topic 830): Parent's Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (“ASU 2013-05”). Under ASU 2013-05 when: a parent sells an investment in a foreign entity and ceases to have a controlling interest in that foreign entity or a foreign subsidiary disposes of substantially all of its assets; or, control of a foreign entity is obtained in which it held an equity interest before the acquisition date, the cumulative translation adjustment should be released into net income. The adoption of ASU 2013-05 did not have a significant impact on our results of operations or financial position.
	On January 1, 2014 we adopted FASB ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 eliminates a diversity in practice regarding the presentation of an unrecognized tax benefit when a net operating loss carryforward or a tax credit carryforward exists. The adoption of ASU 2013-11 did not have a significant impact on the presentation of our results of operations or financial position.

Net_Income_Per_Common_Share

Net Income Per Common Share	3 Months Ended
	Mar. 31, 2014
Net Income per Common Share [Abstract]	'
Net Income per Common Share	'
	Net Income per Common Share
	The computations of basic and diluted net income per common share for the three months ended March 31, 2014 and 2013 were (in millions, except per share amounts):
		2014			2013
	Net Income Available for Common Shares:
	Net income - Omnicom Group Inc.	$	205.5		$	205.1
	Net income allocated to participating securities	(4.1		)	(5.4		)
		$	201.4		$	199.7
	Weighted Average Shares:
	Basic	259.1			261
	Dilutive stock options, restricted shares and shares issuable	2.3			2.2
	for the conversion premium of convertible debt
	Diluted	261.4			263.2
	Anti-dilutive stock options and restricted shares	0.1			0.1
	Net Income per Common Share - Omnicom Group Inc.:
	Basic	$	0.78		$	0.76
	Diluted	$	0.77		$	0.76

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill and intangible assets at March 31, 2014 and December 31, 2013 were (in millions):
		2014								2013
		Gross			Accumulated			Net		Gross		Accumulated		Net
		Carrying			Amortization			Carrying		Carrying		Amortization		Carrying
		Value						Value		Value				Value
	Goodwill	$	9,573.80		$	587.1		$	8,986.70	$	9,502.60	$	586.6	$	8,916.00
	Intangible assets:
	Purchased and internally developed software	$	290.9		$	224.8		$	66.1	$	283.2	$	217.4	$	65.8
	Customer related and other	671.3			352.7			318.6		655.1		334.9		320.2
		$	962.2		$	577.5		$	384.7	$	938.3	$	552.3	$	386
	Changes in goodwill for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Balance January 1	$	8,916.00		$	8,844.20
	Acquisitions	51.4			1.5
	Dispositions	(1.2		)	(0.6		)
	Foreign currency translation	20.5			(131.2		)
	Balance March 31	$	8,986.70		$	8,713.90
	There were no goodwill impairment losses recorded in the first three months of 2014 or 2013 and there are no accumulated goodwill impairment losses. Goodwill resulting from acquisitions completed during 2014 and 2013 includes $10.9 million and $0.7 million, respectively, of goodwill attributed to noncontrolling interests in the acquired businesses.

Debt

Debt	3 Months Ended
	Mar. 31, 2014
Debt [Abstract]	'
Debt	'
	Debt
	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 issuances and such issuances reduce the amount available under the Credit Agreement. At March 31, 2014 and December 31, 2013 there were no outstanding commercial paper issuances or borrowings under the Credit Agreement. We also have uncommitted lines of credit aggregating $1,046.1 million and $1,051.5 million at March 31, 2014 and December 31, 2013, respectively.
	Available and unused lines of credit at March 31, 2014 and December 31, 2013 were (in millions):
		2014		2013
	Credit Agreement	$	2,500.00	$	2,500.00
	Uncommitted lines of credit	1,046.10		1,051.50
	Available and unused lines of credit	$	3,546.10	$	3,551.50
	The Credit Agreement contains financial covenants that require us to maintain a Leverage Ratio of consolidated indebtedness to 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) and an Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5 times for the most recently ended 12-month period. At March 31, 2014 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 $7.5 million and $5.9 million at March 31, 2014 and December 31, 2013, 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 March 31, 2014 and December 31, 2013 were (in millions):
		2014		2013
	5.90% Senior Notes due April 15, 2016	$	1,000.00	$	1,000.00
	6.25% Senior Notes due July 15, 2019	500		500
	4.45% Senior Notes due August 15, 2020	1,000.00		1,000.00
	3.625% Senior Notes due May 1, 2022	1,250.00		1,250.00
	Other notes and loans	0.5		0.5
		3,750.50		3,750.50
	Unamortized premium (discount) on Senior Notes, net	14.4		14.7
	Deferred gain from termination of interest rate swaps on Senior Notes due 2016	14.1		15.9
		3,779.00		3,781.10
	Less current portion	0.4		0.4
	Long-term notes payable	$	3,778.60	$	3,780.70
	Convertible Debt
	Convertible debt at March 31, 2014 and December 31, 2013 was (in millions):
		2014		2013
	Convertible Notes - due July 31, 2032	$	252.7	$	252.7
	Less current portion	252.7		—
	Convertible debt	$	—	$	252.7
	Holders of the Convertible Notes due July 31, 2032 (the “2032 Notes”) have the right to put the notes back to us for cash on July 31 of each year and we have the right to redeem the notes for cash at any time on or after July 31, 2014. There are no events that accelerate the noteholders’ put rights. At March 31, 2014, the 2032 Notes were classified as current in our balance sheet.
	If the 2032 Notes become convertible and the holders of our 2032 Notes exercise their conversion right, the conversion obligation is equal to a conversion value determined on the day of conversion, calculated by multiplying the share price at the close of business on that day by 18.373 shares (subject to any adjustments required by the Indenture governing the 2032 Notes). We satisfy the conversion value by paying the initial principal amount of the note in cash and the balance of the conversion value in cash or shares, at our option. The put obligation can only be satisfied in cash.

Segment_Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2014
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 region as of and for the periods ended March 31, 2014 and 2013 were (in millions):
		Americas		EMEA		Asia Pacific
	2014
	Revenue - Three months ended	$	2,083.80	$	1,059.30	$	359.1
	Long-lived assets and goodwill	6,101.20		3,009.00		608.5
	2013
	Revenue - Three months ended	$	2,037.20	$	1,001.20	$	360.5
	Long-lived assets and goodwill	6,064.40		2,735.10		622.4
	The Americas is composed of North America, which includes the United States, Canada and Puerto Rico, and Latin America, which includes Mexico. 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.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	Income Taxes
	Our effective tax rate for the three months ended March 31, 2014 and 2013 was 33.8% and 33.0%, respectively.
	At March 31, 2014, our unrecognized tax benefits were $133.7 million. Of this amount, approximately $57.6 million would affect our effective tax rate upon resolution of the uncertain tax positions.

Pension_and_Other_Postemployme

Pension and Other Postemployment Benefits	3 Months Ended
	Mar. 31, 2014
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 three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	1.7		$	1.2
	Interest cost	1.7			1.5
	Expected return on plan assets	(0.7		)	(0.7		)
	Amortization of prior service cost	1.1			0.9
	Amortization of actuarial (gains) losses	0.5			1.1
		$	4.3		$	4
	We contributed $0.2 million and $1.2 million to our defined benefit pension plans in the three months ended March 31, 2014 and 2013, respectively.
	Postemployment Arrangements
	The components of net periodic benefit cost for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	1		$	1.1
	Interest cost	1.1			1
	Amortization of prior service cost	0.5			0.5
	Amortization of actuarial (gains) losses	0.2			0.5
		$	2.8		$	3.1
	Net periodic benefit cost is included in the salary and service costs component of operating expenses.

Operating_Expenses

Operating Expenses	3 Months Ended
	Mar. 31, 2014
Operating Expenses [Abstract]	'
Operating Expenses	'
	Operating Expenses
	Operating expenses for the three months ended March 31, 2014 and 2013 were comprised of (in millions):
		2014		2013
	Salary and service costs	$	2,622.80	$	2,541.00
	Office and general expenses	489.7		486.2
	Merger expenses	7		—
	Operating expenses	$	3,119.50	$	3,027.20

Supplemental_Cash_Flow_Data

Supplemental Cash Flow Data	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Data [Abstract]	'
Supplemental Cash Flow Data	'
	Supplemental Cash Flow Data
	The change in operating capital for the three months ended March 31, 2014 and 2013 was (in millions):
		2014			2013
	(Increase) decrease in accounts receivable	$	627.4		$	544.3
	(Increase) decrease in work in process and other current assets	(188.5		)	(221.6		)
	Increase (decrease) in accounts payable	(948.3		)	(886.9		)
	Increase (decrease) in customer advances and other current liabilities	(96.2		)	58.9
	Change in other assets and liabilities, net	(136.7		)	(6.5		)
		$	(742.3	)	$	(511.8	)
	Income taxes paid	$	165.9		$	108.7
	Interest paid	$	41.6		$	40.8

Commitments_and_Contingent_Lia

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2014
Commitments and Contingent Liabilities [Abstract]	'
Commitments and Contingent Liabilities	'
	Commitments and Contingent Liabilities
	A putative class action challenging the Business Combination was filed on August 5, 2013 on behalf of Omnicom shareholders in the Supreme Court of the State of New York, New York County. The action, entitled Ansfield v. Wren, et al., names as defendants Omnicom and its board of directors, as well as Publicis and HoldCo. It alleges that the members of the Omnicom board breached their fiduciary duties by, among other things, approving a merger that is purportedly detrimental to Omnicom’s shareholders. The action also alleges that Publicis aided and abetted the Omnicom board’s breach of their fiduciary duties. The action seeks an injunction barring or rescinding the Business Combination, damages and attorneys’ fees and costs.
	Two additional purported class actions were subsequently filed in the Supreme Court of the State of New York, New York County: Lee v. Omnicom Group, et al., filed on August 14, 2013, and Fultz v. Crawford et al., filed on August 20, 2013. Both of these actions name as defendants Omnicom and its board of directors, as well as Publicis, and make substantially the same allegations and seek substantially the same relief as the Ansfield case.
	On August 19, 2013, plaintiffs in the Ansfield and Lee actions filed a motion to consolidate those actions with each other and with all subsequently filed or transferred actions arising out of the same facts and circumstances, to select plaintiffs as lead plaintiffs and to approve plaintiffs’ selection of counsel as co-lead counsel. On October 3, 2013, plaintiffs in all three cases asked the Court to consolidate the three cases, and to approve lead plaintiffs and plaintiffs’ selection of counsel as co-lead counsel.
	On October 24, 2013, the Court approved plaintiffs’ motion to consolidate the Ansfield, Lee, and Fultz actions with each other and with all subsequently filed or transferred actions arising out of the same facts and circumstances under the caption: In re Omnicom Group Inc. Shareholder Litigation, Index No. 652737/2013, and in the same order appointed co-lead counsel. On October 29, 2013, the Court approved the parties’ stipulation requiring plaintiffs to file an amended complaint within three weeks after HoldCo files a preliminary proxy statement/prospectus.
	Omnicom believes the consolidated lawsuit is without merit and intends to defend vigorously against it. Due to the inherent uncertainties of such matters, and because discovery is not yet completed, we are unable to predict potential outcomes or estimate of the range of potential damages, if any. Management does not presently expect that the outcome of this matter will have a material adverse effect on our results of operations or financial position.
	In the ordinary course of business, we are involved in various other legal proceedings. We do not presently expect that these other proceedings will have a material adverse effect on our results of operations or financial position.

Fair_Value

Fair Value	3 Months Ended
	Mar. 31, 2014
Fair Value [Abstract]	'
Fair Value	'
	Fair Value
	Financial assets and liabilities measured at fair value on a recurring basis at March 31, 2014 and December 31, 2013 were (in millions):
	March 31, 2014	Level 1			Level 2			Level 3		Total
	Assets:
	Cash and cash equivalents	$	2,082.10							$	2,082.10
	Short-term investments	7								7
	Available-for-sale securities	5								5
	Forward foreign exchange contracts				$	0.7				0.7
	Liabilities:
	Forward foreign exchange contracts				$	0.1				$	0.1
	Contingent interest derivative				1.4					1.4
	Contingent purchase price obligations							$	256.8	256.8
	December 31, 2013	Level 1			Level 2			Level 3		Total
	Assets:
	Cash and cash equivalents	$	2,710.50							$	2,710.50
	Short-term investments	18.2								18.2
	Available-for-sale securities	4.9								4.9
	Forward foreign exchange contracts				$	2.2				2.2
	Liabilities:
	Forward foreign exchange contracts				$	0.1				$	0.1
	Contingent interest derivative				2.1					2.1
	Contingent purchase price obligations							$	220.2	220.2
	The changes in Level 3 contingent purchase price obligations for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Balance January 1	$	220.2		$	266.2
	Acquisitions	43.2			1.6
	Revaluation and interest	(0.8		)	1.4
	Payments	(7.8		)	(13.5		)
	Foreign currency translation	2			(16.1		)
	Balance March 31	$	256.8		$	239.6
	The carrying amount and fair value of our financial instruments at March 31, 2014 and December 31, 2013 were (in millions):
		2014						2013
		Carrying			Fair			Carrying		Fair
		Amount			Value			Amount		Value
	Assets:
	Cash and cash equivalents	$	2,082.10		$	2,082.10		$	2,710.50	$	2,710.50
	Short-term investments	7			7			18.2		18.2
	Available-for-sale securities	5			5			4.9		4.9
	Forward foreign exchange contracts	0.7			0.7			2.2		2.2
	Cost method investments	21.7			21.7			22.2		22.2
	Liabilities:
	Short-term borrowings	$	7.5		$	7.5		$	5.9	$	5.9
	Forward foreign exchange contracts	0.1			0.1			0.1		0.1
	Contingent interest derivative	1.4			1.4			2.1		2.1
	Contingent purchase price obligations	256.8			256.8			220.2		220.2
	Debt	4,031.70			4,335.50			4,033.80		4,302.70
	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.

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2014
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 three months ended March 31, 2014 and 2013 were (in millions):
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	Balance January 1, 2014	$	(1.6	)	$	(68.8	)	$	(121.2	)	$	(191.6	)
	Other comprehensive income before reclassifications	0.1			—			20.4			20.5
	Amounts reclassified from accumulated other comprehensive income (loss)	—			1.4			—			1.4
	Other comprehensive income	0.1			1.4			20.4			21.9
	Balance March 31, 2014	$	(1.5	)	$	(67.4	)	$	(100.8	)	$	(169.7	)
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	Balance January 1, 2013	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
	Other comprehensive income before reclassifications	0.2			—			(172.8		)	(172.6		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—			1.7			—			1.7
	Other comprehensive income	0.2			1.7			(172.8		)	(170.9		)
	Balance March 31, 2013	$	(1.8	)	$	(88.1	)	$	(210.5	)	$	(300.4	)
	Reclassifications from accumulated other comprehensive income (loss) for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Amortization of defined benefit pension and postemployment plans:
	Prior service cost	$	1.6		$	1.4
	Actuarial (gains) losses	0.7			1.6
	Net periodic benefit cost (see Note 9)	2.3			3
	Income tax expense	0.9			1.3
	Net of tax	$	1.4		$	1.7

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2014
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.

Net_Income_Per_Common_Share_Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2014
Net Income per Common Share [Abstract]	'
Computations of Basic and Diluted Net Income per Common Share - Omnicom Group Inc.	'
	The computations of basic and diluted net income per common share for the three months ended March 31, 2014 and 2013 were (in millions, except per share amounts):
		2014			2013
	Net Income Available for Common Shares:
	Net income - Omnicom Group Inc.	$	205.5		$	205.1
	Net income allocated to participating securities	(4.1		)	(5.4		)
		$	201.4		$	199.7
	Weighted Average Shares:
	Basic	259.1			261
	Dilutive stock options, restricted shares and shares issuable	2.3			2.2
	for the conversion premium of convertible debt
	Diluted	261.4			263.2
	Anti-dilutive stock options and restricted shares	0.1			0.1
	Net Income per Common Share - Omnicom Group Inc.:
	Basic	$	0.78		$	0.76
	Diluted	$	0.77		$	0.76

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and intangible assets at March 31, 2014 and December 31, 2013 were (in millions):
		2014								2013
		Gross			Accumulated			Net		Gross		Accumulated		Net
		Carrying			Amortization			Carrying		Carrying		Amortization		Carrying
		Value						Value		Value				Value
	Goodwill	$	9,573.80		$	587.1		$	8,986.70	$	9,502.60	$	586.6	$	8,916.00
	Intangible assets:
	Purchased and internally developed software	$	290.9		$	224.8		$	66.1	$	283.2	$	217.4	$	65.8
	Customer related and other	671.3			352.7			318.6		655.1		334.9		320.2
		$	962.2		$	577.5		$	384.7	$	938.3	$	552.3	$	386
Changes in Goodwill	'
	Changes in goodwill for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Balance January 1	$	8,916.00		$	8,844.20
	Acquisitions	51.4			1.5
	Dispositions	(1.2		)	(0.6		)
	Foreign currency translation	20.5			(131.2		)
	Balance March 31	$	8,986.70		$	8,713.90

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2014
Available and Unused Lines of Credit	'
	Available and unused lines of credit at March 31, 2014 and December 31, 2013 were (in millions):
		2014		2013
	Credit Agreement	$	2,500.00	$	2,500.00
	Uncommitted lines of credit	1,046.10		1,051.50
	Available and unused lines of credit	$	3,546.10	$	3,551.50
Long-Term Notes Payable [Member]	'
Long-Term Debt	'
	Long-term notes payable at March 31, 2014 and December 31, 2013 were (in millions):
		2014		2013
	5.90% Senior Notes due April 15, 2016	$	1,000.00	$	1,000.00
	6.25% Senior Notes due July 15, 2019	500		500
	4.45% Senior Notes due August 15, 2020	1,000.00		1,000.00
	3.625% Senior Notes due May 1, 2022	1,250.00		1,250.00
	Other notes and loans	0.5		0.5
		3,750.50		3,750.50
	Unamortized premium (discount) on Senior Notes, net	14.4		14.7
	Deferred gain from termination of interest rate swaps on Senior Notes due 2016	14.1		15.9
		3,779.00		3,781.10
	Less current portion	0.4		0.4
	Long-term notes payable	$	3,778.60	$	3,780.70
Convertible Debt [Member]	'
Long-Term Debt	'
	Convertible debt at March 31, 2014 and December 31, 2013 was (in millions):
		2014		2013
	Convertible Notes - due July 31, 2032	$	252.7	$	252.7
	Less current portion	252.7		—
	Convertible debt	$	—	$	252.7

Segment_Reporting_Tables

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Revenue and Long-Lived Assets and Goodwill by Geographic Region	'
	Revenue and long-lived assets and goodwill by geographic region as of and for the periods ended March 31, 2014 and 2013 were (in millions):
		Americas		EMEA		Asia Pacific
	2014
	Revenue - Three months ended	$	2,083.80	$	1,059.30	$	359.1
	Long-lived assets and goodwill	6,101.20		3,009.00		608.5
	2013
	Revenue - Three months ended	$	2,037.20	$	1,001.20	$	360.5
	Long-lived assets and goodwill	6,064.40		2,735.10		622.4

Pension_and_Other_Postemployme1

Pension and Other Postemployment Benefits (Tables)	3 Months Ended
	Mar. 31, 2014
Defined Benefit Pension Plans [Member]	'
Components of Net Periodic Benefit Cost	'
	Defined Benefit Pension Plans
	The components of net periodic benefit cost for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	1.7		$	1.2
	Interest cost	1.7			1.5
	Expected return on plan assets	(0.7		)	(0.7		)
	Amortization of prior service cost	1.1			0.9
	Amortization of actuarial (gains) losses	0.5			1.1
		$	4.3		$	4
Postemployment Arrangements [Member]	'
Components of Net Periodic Benefit Cost	'
	Postemployment Arrangements
	The components of net periodic benefit cost for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	1		$	1.1
	Interest cost	1.1			1
	Amortization of prior service cost	0.5			0.5
	Amortization of actuarial (gains) losses	0.2			0.5
		$	2.8		$	3.1

Operating_Expenses_Tables

Operating Expenses (Tables)	3 Months Ended
	Mar. 31, 2014
Operating Expenses [Abstract]	'
Components of Operating Expenses	'
	Operating expenses for the three months ended March 31, 2014 and 2013 were comprised of (in millions):
		2014		2013
	Salary and service costs	$	2,622.80	$	2,541.00
	Office and general expenses	489.7		486.2
	Merger expenses	7		—
	Operating expenses	$	3,119.50	$	3,027.20

Supplemental_Cash_Flow_Data_Ta

Supplemental Cash Flow Data (Tables)	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Data [Abstract]	'
Changes in Operating Capital	'
	The change in operating capital for the three months ended March 31, 2014 and 2013 was (in millions):
		2014			2013
	(Increase) decrease in accounts receivable	$	627.4		$	544.3
	(Increase) decrease in work in process and other current assets	(188.5		)	(221.6		)
	Increase (decrease) in accounts payable	(948.3		)	(886.9		)
	Increase (decrease) in customer advances and other current liabilities	(96.2		)	58.9
	Change in other assets and liabilities, net	(136.7		)	(6.5		)
		$	(742.3	)	$	(511.8	)
	Income taxes paid	$	165.9		$	108.7
	Interest paid	$	41.6		$	40.8

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2014
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 March 31, 2014 and December 31, 2013 were (in millions):
	March 31, 2014	Level 1			Level 2			Level 3		Total
	Assets:
	Cash and cash equivalents	$	2,082.10							$	2,082.10
	Short-term investments	7								7
	Available-for-sale securities	5								5
	Forward foreign exchange contracts				$	0.7				0.7
	Liabilities:
	Forward foreign exchange contracts				$	0.1				$	0.1
	Contingent interest derivative				1.4					1.4
	Contingent purchase price obligations							$	256.8	256.8
	December 31, 2013	Level 1			Level 2			Level 3		Total
	Assets:
	Cash and cash equivalents	$	2,710.50							$	2,710.50
	Short-term investments	18.2								18.2
	Available-for-sale securities	4.9								4.9
	Forward foreign exchange contracts				$	2.2				2.2
	Liabilities:
	Forward foreign exchange contracts				$	0.1				$	0.1
	Contingent interest derivative				2.1					2.1
	Contingent purchase price obligations							$	220.2	220.2
Changes in Level 3 Contingent Purchase Price Obligations	'
	The changes in Level 3 contingent purchase price obligations for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Balance January 1	$	220.2		$	266.2
	Acquisitions	43.2			1.6
	Revaluation and interest	(0.8		)	1.4
	Payments	(7.8		)	(13.5		)
	Foreign currency translation	2			(16.1		)
	Balance March 31	$	256.8		$	239.6
Carrying Amounts and Fair Value of Financial Instruments	'
	The carrying amount and fair value of our financial instruments at March 31, 2014 and December 31, 2013 were (in millions):
		2014						2013
		Carrying			Fair			Carrying		Fair
		Amount			Value			Amount		Value
	Assets:
	Cash and cash equivalents	$	2,082.10		$	2,082.10		$	2,710.50	$	2,710.50
	Short-term investments	7			7			18.2		18.2
	Available-for-sale securities	5			5			4.9		4.9
	Forward foreign exchange contracts	0.7			0.7			2.2		2.2
	Cost method investments	21.7			21.7			22.2		22.2
	Liabilities:
	Short-term borrowings	$	7.5		$	7.5		$	5.9	$	5.9
	Forward foreign exchange contracts	0.1			0.1			0.1		0.1
	Contingent interest derivative	1.4			1.4			2.1		2.1
	Contingent purchase price obligations	256.8			256.8			220.2		220.2
	Debt	4,031.70			4,335.50			4,033.80		4,302.70

Changes_in_Accumulated_Other_C1

Changes in Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2014
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 three months ended March 31, 2014 and 2013 were (in millions):
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	Balance January 1, 2014	$	(1.6	)	$	(68.8	)	$	(121.2	)	$	(191.6	)
	Other comprehensive income before reclassifications	0.1			—			20.4			20.5
	Amounts reclassified from accumulated other comprehensive income (loss)	—			1.4			—			1.4
	Other comprehensive income	0.1			1.4			20.4			21.9
	Balance March 31, 2014	$	(1.5	)	$	(67.4	)	$	(100.8	)	$	(169.7	)
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	Balance January 1, 2013	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
	Other comprehensive income before reclassifications	0.2			—			(172.8		)	(172.6		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—			1.7			—			1.7
	Other comprehensive income	0.2			1.7			(172.8		)	(170.9		)
	Balance March 31, 2013	$	(1.8	)	$	(88.1	)	$	(210.5	)	$	(300.4	)
Reclassifications from accumulated other comprehensive income (loss)	'
	Reclassifications from accumulated other comprehensive income (loss) for the three months ended March 31, 2014 and 2013 were (in millions):
		2014			2013
	Amortization of defined benefit pension and postemployment plans:
	Prior service cost	$	1.6		$	1.4
	Actuarial (gains) losses	0.7			1.6
	Net periodic benefit cost (see Note 9)	2.3			3
	Income tax expense	0.9			1.3
	Net of tax	$	1.4		$	1.7

Pending_Business_Combination_D

Pending Business Combination (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
		Publicis Merger [Member]	Omnicom Merger [Member]
		EUR (€)	USD ($)
Date of Business Combination Agreement	27-Jul-13	'	'
Number of Shares of Combined Entity to be Exchanged Per Share of Merging Entity	'	1	0.813008
Business Combination Agreement, Transaction Dividend to be Declared	'	€ 1	$2
Business Combination Agreement, Maximum Dividends to be Excluded from Equalization	'	'	$0.80

Net_Income_Per_Common_Share_De

Net Income Per Common Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net Income Available for Common Shares:	'	'
Net income - Omnicom Group Inc.	$205.50	$205.10
Net income allocated to participating securities	-4.1	-5.4
Net income available for common shares	$201.40	$199.70
Weighted Average Shares:	'	'
Basic	259.1	261
Dilutive stock options, restricted shares and shares issuable for the conversion premium of convertible debt	2.3	2.2
Diluted	261.4	263.2
Anti-dilutive stock options and restricted shares	0.1	0.1
Net Income per Common Share - Omnicom Group Inc.:	'	'
Basic	$0.78	$0.76
Diluted	$0.77	$0.76

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill, Gross Carrying Value	$9,573.80	'	$9,502.60
Goodwill, Accumulated Amortization	587.1	'	586.6
Goodwill, Net Carrying Value	8,986.70	8,713.90	'
Intangible assets:, Gross Carrying Value	962.2	'	938.3
Intangible assets:, Accumulated Amortization	577.5	'	552.3
Intangible assets:, Net Carrying Value	384.7	'	386
Goodwill [Roll Forward]	'	'	'
Goodwill, Balance January 1	8,916	'	'
Goodwill, Acquisitions	51.4	1.5	'
Goodwill, Dispositions	-1.2	-0.6	'
Goodwill, Foreign currency translation	20.5	-131.2	'
Goodwill, Balance March 31	8,986.70	8,713.90	'
Goodwill, impairment losses	0	'	'
Goodwill, accumulated impairment losses	0	'	'
Goodwill, acquisitions of noncontrolling interests	10.9	0.7	'
Purchased and internally developed software	'	'	'
Intangible assets:, Gross Carrying Value	290.9	'	283.2
Intangible assets:, Accumulated Amortization	224.8	'	217.4
Intangible assets:, Net Carrying Value	66.1	'	65.8
Customer related and other	'	'	'
Intangible assets:, Gross Carrying Value	671.3	'	655.1
Intangible assets:, Accumulated Amortization	352.7	'	334.9
Intangible assets:, Net Carrying Value	$318.60	'	$320.20

Debt_Details

Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Lines of Credit [Abstract]	'	'
Available and unused lines of credit	$3,546,100,000	$3,551,500,000
Short-Term Borrowings [Abstract]	'	'
Short-term borrowings	7,500,000	5,900,000
Long-Term Notes Payable [Abstract]	'	'
Long-term notes payable, carrying amount	3,750,500,000	3,750,500,000
Unamortized premium (discount) on Senior Notes, net	14,400,000	14,700,000
Deferred gain from termination of interest rate swaps on Senior Notes due 2016	14,100,000	15,900,000
Long-term notes payable, total	3,779,000,000	3,781,100,000
Long-term notes payable, current portion	400,000	400,000
Long-Term Notes Payable	3,778,600,000	3,780,700,000
Convertible Debt [Abstract]	'	'
Convertible debt, current	252,700,000	0
Convertible Debt	0	252,700,000
Credit Agreement expiring October 2016 [Member]	'	'
Lines of Credit [Abstract]	'	'
Credit Agreement, expiration date	12-Oct-16	'
Available and unused lines of credit	2,500,000,000	2,500,000,000
Credit Agreement, covenant terms	'The Credit Agreement contains financial covenants that require us to maintain a Leverage Ratio of consolidated indebtedness to 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) and an 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 March 31, 2014 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	'
Uncommitted lines of credit [Member]	'	'
Lines of Credit [Abstract]	'	'
Available and unused lines of credit	1,046,100,000	1,051,500,000
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
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest rate	5.90%	'
Maturity date	15-Apr-16	'
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
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest rate	6.25%	'
Maturity date	15-Jul-19	'
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
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest rate	4.45%	'
Maturity date	15-Aug-20	'
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
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest rate	3.63%	'
Maturity date	1-May-22	'
Other notes and loans	'	'
Long-Term Notes Payable [Abstract]	'	'
Long-term notes payable, carrying amount	500,000	500,000
Convertible Notes - due July 31, 2032	'	'
Convertible Debt [Abstract]	'	'
Convertible debt, total	$252,700,000	$252,700,000
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest rate	0.00%	'
Maturity date	31-Jul-32	'
Convertible debt, put terms	'Holders of the Convertible Notes due July 31, 2032 (the “2032 Notes”) have the right to put the notes back to us for cash on July 31 of each year and we have the right to redeem the notes for cash at any time on or after July 31, 2014. There are no events that accelerate the noteholders’ put rights.	'
Convertible debt, conversion rate	18.373	'

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$3,502.20	$3,398.90
Americas	'	'
Revenue	2,083.80	2,037.20
Long-lived assets and goodwill	6,101.20	6,064.40
EMEA	'	'
Revenue	1,059.30	1,001.20
Long-lived assets and goodwill	3,009	2,735.10
Asia Pacific	'	'
Revenue	359.1	360.5
Long-lived assets and goodwill	$608.50	$622.40

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]	'	'
Effective income tax rate	33.80%	33.00%
Unrecognized tax benefits	$133.70	'
Unrecognized tax benefits that would impact effective tax rate	$57.60	'

Pension_and_Other_Postemployme2

Pension and Other Postemployment Benefits (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Pension Plans [Member]	'	'
Components of Net Periodic Benefit Cost [Abstract]	'	'
Service cost	$1.70	$1.20
Interest cost	1.7	1.5
Expected return on plan assets	-0.7	-0.7
Amortization of prior service cost	1.1	0.9
Amortization of actuarial (gains) losses	0.5	1.1
Net periodic benefit cost	4.3	4
Defined benefit pension plans, contributions by employer	0.2	1.2
Postemployment Arrangements [Member]	'	'
Components of Net Periodic Benefit Cost [Abstract]	'	'
Service cost	1	1.1
Interest cost	1.1	1
Amortization of prior service cost	0.5	0.5
Amortization of actuarial (gains) losses	0.2	0.5
Net periodic benefit cost	$2.80	$3.10

Operating_Expenses_Details

Operating Expenses (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Expenses [Abstract]	'	'
Salary and service costs	$2,622.80	$2,541
Office and general expenses	489.7	486.2
Merger expenses	7	0
Operating expenses	$3,119.50	$3,027.20

Supplemental_Cash_Flow_Data_De

Supplemental Cash Flow Data (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Changes in Operating Capital [Abstract]	'	'
(Increase) decrease in accounts receivable	$627.40	$544.30
(Increase) decrease in work in process and other current assets	-188.5	-221.6
Increase (decrease) in accounts payable	-948.3	-886.9
Increase (decrease) in customer advances and other current liabilities	-96.2	58.9
Change in other assets and liabilities, net	-136.7	-6.5
Change in operating capital	-742.3	-511.8
Income taxes paid	165.9	108.7
Interest paid	$41.60	$40.80

Fair_Value_Details

Fair Value (Details) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

In Millions, unless otherwise specified

Contingent purchase price obligations

Contingent purchase price obligations

Contingent purchase price obligations

Contingent purchase price obligations

Carrying Amount

Carrying Amount

Fair Value

Fair Value

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Interest Expense [Member]

Interest Expense [Member]

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Total

Total

Assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

'

'

'

'

'

'

$2,082.10

$2,710.50

$2,082.10

$2,710.50

$2,082.10

$2,710.50

'

'

'

'

$2,082.10

$2,710.50

Short-term investments

7

18.2

'

'

'

'

7

18.2

7

18.2

7

18.2

'

'

'

'

7

18.2

Available-for-sale securities

'

'

'

'

'

'

5

4.9

5

4.9

5

4.9

'

'

'

'

5

4.9

Forward foreign exchange contracts

'

'

'

'

'

'

0.7

2.2

0.7

2.2

'

'

0.7

2.2

'

'

0.7

2.2

Cost method investments

'

'

'

'

'

'

21.7

22.2

21.7

22.2

'

'

'

'

'

'

'

'

Liabilities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Short-term borrowings

'

'

'

'

'

'

7.5

5.9

7.5

5.9

'

'

'

'

'

'

'

'

Forward foreign exchange contracts

'

'

'

'

'

'

0.1

0.1

0.1

0.1

'

'

0.1

0.1

'

'

0.1

0.1

Contingent interest derivative

'

'

'

'

'

'

1.4

2.1

1.4

2.1

'

'

1.4

2.1

'

'

1.4

2.1

Contingent purchase price obligations

'

'

'

'

'

'

256.8

220.2

256.8

220.2

'

'

'

'

256.8

220.2

256.8

220.2

Debt

'

'

'

'

'

'

4,031.70

4,033.80

4,335.50

4,302.70

'

'

'

'

'

'

'

'

Changes in Level 3 Contingent Purchase Price Obligations [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance January 1

'

'

220.2

266.2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions

'

'

43.2

1.6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revaluation and interest

'

'

'

'

-0.8

1.4

'

'

'

'

'

'

'

'

'

'

'

'

Payments

'

'

-7.8

-13.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Foreign currency translation

'

'

2

-16.1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance March 31

'

'

$256.80

$239.60

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Changes_in_Accumulated_Other_C2

Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
Balance January 1, 2013	($191.60)	($129.50)
Other comprehensive income before reclassifications	20.5	-172.6
Amounts reclassified from accumulated other comprehensive income (loss)	1.4	1.7
Other comprehensive income	21.9	-170.9
Balance March 31, 2013	-169.7	-300.4
Unrealized Gain (Loss) on Available-for-Sale Securities	'	'
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
Balance January 1, 2013	-1.6	-2
Other comprehensive income before reclassifications	0.1	0.2
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income	0.1	0.2
Balance March 31, 2013	-1.5	-1.8
Defined Benefit Pension and Postemployment Plans	'	'
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
Balance January 1, 2013	-68.8	-89.8
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	1.4	1.7
Other comprehensive income	1.4	1.7
Balance March 31, 2013	-67.4	-88.1
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	1.6	1.4
Actuarial (gains) losses	0.7	1.6
Net periodic benefit cost (see Note 9)	2.3	3
Income tax expense	0.9	1.3
Net of tax	1.4	1.7
Foreign Currency Translation	'	'
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
Balance January 1, 2013	-121.2	-37.7
Other comprehensive income before reclassifications	20.4	-172.8
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income	20.4	-172.8
Balance March 31, 2013	($100.80)	($210.50)