Omnicom (OMC) 10-Q 21 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 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	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	248,179,673

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$837.70	$2,710.50
Short-term investments, at cost	12.6	18.2
Accounts receivable, net of allowance for doubtful accounts of $28.6 and $32.6	6,135.70	6,632.60
Work in process	1,528	1,288
Other current assets	1,053.20	1,003
Total Current Assets	9,567.20	11,652.30
Property and Equipment at cost, less accumulated depreciation of $1,257.9 and $1,230.1	713.6	737.4
Equity Method Investments	153.6	131.8
Goodwill	8,875.20	8,916
Intangible Assets, net of accumulated amortization of $603.6 and $552.3	387	386
Other Assets	272	275.2
TOTAL ASSETS	19,968.60	22,098.70
Current Liabilities:	'	'
Accounts payable	7,448.60	8,358.90
Customer advances	1,130.60	1,242.20
Current portion of debt	0.3	0.4
Short-term borrowings	31.3	5.9
Taxes payable	275.7	293.3
Other current liabilities	2,188.80	2,377
Total Current Liabilities	11,075.30	12,277.70
Long-Term Notes Payable	3,778.90	3,780.70
Convertible Debt	0	252.7
Long-Term Liabilities	680	685.1
Long-Term Deferred Tax Liabilities	732.8	832.6
Commitments and Contingent Liabilities (See Note 12)	'	'
Temporary Equity - Redeemable Noncontrolling Interests	190.2	202
Shareholders’ Equity:	'	'
Preferred stock	0	0
Common stock	59.6	59.6
Additional paid-in capital	842.6	817.1
Retained earnings	9,373.60	8,961.20
Accumulated other comprehensive income (loss)	-420.1	-191.6
Treasury stock, at cost	-6,817.40	-6,063.90
Total Shareholders’ Equity	3,038.30	3,582.40
Noncontrolling interests	473.1	485.5
Total Equity	3,511.40	4,067.90
TOTAL LIABILITIES AND EQUITY	$19,968.60	$22,098.70

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Allowance for doubtful accounts	$28.60	$32.60
Accumulated depreciation	1,257.90	1,230.10
Intangible assets, accumulated amortization	$603.60	$552.30

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$3,749.60	$3,490.50	$11,122.70	$10,526.40
Operating Expenses	3,316	3,111.10	9,758	9,252.20
Operating Income	433.6	379.4	1,364.70	1,274.20
Interest Expense	42.2	50.5	135.4	148.8
Interest Income	10.8	7.7	31.3	24.2
Income Before Income Taxes and Income From Equity Method Investments	402.2	336.6	1,260.60	1,149.60
Income Tax Expense	134.4	116.2	410.9	388.9
Income From Equity Method Investments	5.8	4.3	10.4	10.5
Net Income	273.6	224.7	860.1	771.2
Net Income Attributed To Noncontrolling Interests	-29.8	-28.7	-85.6	-80.5
Net Income - Omnicom Group Inc.	$243.80	$196	$774.50	$690.70
Net Income Per Share - Omnicom Group Inc.:	'	'	'	'
Basic	$0.95	$0.74	$2.97	$2.60
Diluted	$0.95	$0.74	$2.95	$2.58
Dividends Declared Per Common Share	$0.50	$0.40	$1.40	$1.20

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income	$273.60	$224.70	$860.10	$771.20
Unrealized gain (loss) on available-for-sale securities, net of income taxes of $0.2 and $0.2 for the nine months ended September 30, 2014 and 2013, respectively	0.1	0	0.3	0.3
Foreign currency translation adjustment, net of income taxes of ($181.7) and $94.4 for the three months and ($128.4) and ($63.6) for the nine months ended September 30, 2014 and 2013, respectively	-352.6	183.4	-249.3	-123.3
Defined benefit pension and postemployment plans adjustment, net of income taxes of $0.9 and $0.7 for the three months and $2.7 and $3.1 for the nine months ended September 30, 2014 and 2013, respectively	1.3	1.1	4.1	4.5
Other Comprehensive Income (Loss)	-351.2	184.5	-244.9	-118.5
Comprehensive Income	-77.6	409.2	615.2	652.7
Comprehensive Income Attributed to Noncontrolling Interests	-2.2	-36.4	-69.2	-53.1
Comprehensive Income - Omnicom Group Inc.	($79.80)	$372.80	$546	$599.60

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unrealized gain (loss) on available-for-sale securities, income taxes	$0	$0	$0.20	$0.20
Foreign currency translation adjustment, income taxes	-181.7	94.4	-128.4	-63.6
Defined benefit pension and postemployment plans adjustment, income taxes	$0.90	$0.70	$2.70	$3.10

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities:	'	'
Net Income	$860.10	$771.20
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation	140.3	136.6
Amortization of intangible assets	77.1	76.3
Amortization of deferred gain from termination of interest rate swaps	-5.4	-5.5
Income from equity method investments, net of dividends received	-0.3	0.4
Provision for doubtful accounts	3.9	4.4
Share-based compensation	69.5	64.9
Excess tax benefit from share-based compensation	-20.2	-34.2
Change in operating capital	-1,091.90	-654.2
Net Cash Provided By Operating Activities	33.1	359.9
Cash Flows from Investing Activities:	'	'
Payments to acquire property and equipment	-138.3	-123.3
Payments to acquire businesses and interests in affiliates, net of cash acquired	-65.3	-26.5
Proceeds from investments, net	6.5	17.3
Net Cash Used In Investing Activities	-197.1	-132.5
Cash Flows from Financing Activities:	'	'
Proceeds from short-term debt	27.3	12.5
Redemption of convertible debt	-252.7	-406.7
Payments of dividends	-340.7	-212.6
Payments for repurchases of common stock	-864.8	-571.3
Proceeds from stock plans	14.6	44.8
Payments for acquisition of additional noncontrolling interests	-22	-11
Payments of dividends to noncontrolling interest shareholders	-83.2	-81.1
Payments of contingent purchase price obligations	-74.5	-68.9
Excess tax benefit on share-based compensation	20.2	34.2
Other, net	-21.7	-24.2
Net Cash Used In Financing Activities	-1,597.50	-1,284.30
Effect of foreign exchange rate changes on cash and cash equivalents	-111.3	-99.9
Net Decrease in Cash and Cash Equivalents	-1,872.80	-1,156.80
Cash and Cash Equivalents at the Beginning of Period	2,710.50	2,678.30
Cash and Cash Equivalents at the End of Period	$837.70	$1,521.50

Presentation_of_Financial_Stat

Presentation of Financial Statements	9 Months Ended
	Sep. 30, 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 consolidated 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 consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2013 (“2013 10-K”). Results for the interim periods are not necessarily indicative of results that may be expected for the year.

New_Accounting_Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 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.
	In May 2014 the FASB issued FASB ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 will be effective for fiscal years and interim periods beginning after December 15, 2016 and early application is not permitted. ASU 2014-09 provides for one of two methods of transition: retrospective application to each prior period presented; or, recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. We will apply ASU 2014-09 on January 1, 2017. However, we are not yet in a position to assess the transition method we will choose, or the impact of the application on our results of operations or financial position.
	In August 2014 the FASB issued FASB ASU 2014-15, Presentation of Financial Statements - Going Concern (“ASU 2014-15”). ASU 2014-15 will be effective for fiscal years and interim periods beginning after December 15, 2016 and early application is permitted. ASU 2014-15 requires that management evaluate at each annual and interim reporting period whether there is a substantial doubt about an entity’s ability to continue as a going concern within one year of the date that the financial statements are issued. We do not expect that the application of ASU 2014-15 will have an impact on the presentation of our results of operations, financial position or disclosures.

Net_Income_Per_Common_Share

Net Income Per Common Share	9 Months Ended
	Sep. 30, 2014
Net Income per Common Share [Abstract]	'
Net Income per Common Share	'
	Net Income per Common Share
	The computation of basic and diluted net income per common share for the three and nine months ended September 30, 2014 and 2013 is (in millions, except per share amounts):
		Three Months						Nine Months
		2014			2013			2014			2013
	Net Income Available for Common Shares:
	Net income - Omnicom Group Inc.	$	243.8		$	196		$	774.5		$	690.7
	Net income allocated to participating securities	(4.3		)	(4.8		)	(14.7		)	(18.1		)
		$	239.5		$	191.2		$	759.8		$	672.6
	Weighted Average Shares:
	Basic	251.4			258.2			255.6			259
	Dilutive stock options, restricted shares and shares issuable for the conversion premium of convertible debt	1			1.7			1.7			1.4
	Diluted	252.4			259.9			257.3			260.4
	Anti-dilutive stock options and restricted shares	—			—			—			0.1
	Net Income per Common Share - Omnicom Group Inc.:
	Basic	$	0.95		$	0.74		$	2.97		$	2.6
	Diluted	$	0.95		$	0.74		$	2.95		$	2.58

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill and intangible assets at September 30, 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	$	9,443.80		$	568.6		$	8,875.20	$	9,502.60	$	586.6	$	8,916.00
	Intangible assets:
	Purchased and internally developed software	$	296.2		$	224.6		$	71.6	$	283.2	$	217.4	$	65.8
	Customer related and other	694.4			379			315.4		655.1		334.9		320.2
		$	990.6		$	603.6		$	387	$	938.3	$	552.3	$	386
	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, 2014, 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, 2014 because the fair value of each of our reporting units was substantially in excess of their respective net book value.
	Changes in goodwill for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	1-Jan	$	8,916.00		$	8,844.20
	Acquisitions	131.4			55.5
	Dispositions	(1.6		)	(8.5		)
	Foreign currency translation	(170.6		)	(22.2		)
	30-Sep	$	8,875.20		$	8,869.00
	There were no goodwill impairment losses recorded in the first nine months of 2014 or 2013 and there are no accumulated goodwill impairment losses. Goodwill for acquisitions completed in 2014 and 2013 includes $27.6 million and $9.2 million, respectively, of goodwill attributed to noncontrolling interests in the acquired businesses.

Debt

Debt	9 Months Ended
	Sep. 30, 2014
Debt [Abstract]	'
Debt	'
	Debt
	Lines of Credit
	On July 31, 2014, we amended our $2.5 billion line of credit (“Credit Agreement”) to extend the term to July 31, 2019. We have the ability to classify borrowings under the Credit Agreement as long-term. In addition, we can issue up to $2.0 billion of commercial paper. At September 30, 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 $950.7 million and $1,051.5 million at September 30, 2014 and December 31, 2013, respectively.
	Available and unused lines of credit at September 30, 2014 and December 31, 2013 were (in millions):
		2014		2013
	Credit Agreement	$	2,500.00	$	2,500.00
	Uncommitted lines of credit	950.7		1,051.50
	Available and unused lines of credit	$	3,450.70	$	3,551.50
	The Credit Agreement contains financial covenants that require us to maintain a Leverage Ratio of consolidated indebtedness to consolidated EBITDA of 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 September 30, 2014, we were in compliance with these covenants, as our Leverage Ratio was 1.7 times and our Interest Coverage Ratio was 12 times. The Credit Agreement does not limit our ability to declare or pay dividends.
	Short-Term Borrowings
	Short-term borrowings of $31.3 million and $5.9 million at September 30, 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 September 30, 2014 and December 31, 2013 were (in millions):
		2014		2013
	5.9% 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	0.3		0.5
		3,750.30		3,750.50
	Unamortized premium (discount) on Senior Notes, net	13.8		14.7
	Adjustment to carrying value for interest rate swaps	15.1		15.9
		3,779.20		3,781.10
	Less current portion	0.3		0.4
	Long-term notes payable	$	3,778.90	$	3,780.70
	On May 1, 2014, we entered into an interest rate swap on the $1.25 billion principal amount of our 3.625% Senior Notes due May 1, 2022 (“2022 Notes”) and on September 29, 2014, we entered into an interest rate swap on the $1 billion principal amount of our 4.45% Senior Notes due August 15, 2020 (“2020 Notes”). The interest rate swaps hedge the risk of changes in fair value of the 2022 Notes and the 2020 Notes attributable to changes in the benchmark LIBOR interest rate. Under the terms of the swaps, we receive fixed interest rate payments and pay a variable interest rate, based on LIBOR, on the total principal amount of the 2022 Notes and the 2020 Notes, respectively. The swaps qualify as a hedge for accounting purposes and were designated as a fair value hedge on the 2022 Notes and 2020 Notes, respectively. The swaps have the economic effect of converting the 2022 Notes and the 2020 Notes from fixed rate debt to floating rate debt. Gains and losses attributed to changes in the fair value of the interest rate swaps substantially offset changes in the fair value of the 2022 Notes and the 2020 Notes, respectively, attributed to changes in the benchmark interest rate. The net interest settlement is recorded in interest expense.
	Convertible Debt
	At September 30, 2014, there was no convertible debt outstanding. Convertible debt outstanding at December 31, 2013 was comprised of our $252.7 million Convertible Notes due July 31, 2032 (“2032 Notes”).
	On June 5, 2014, we called the 2032 Notes for redemption on July 31, 2014 at a redemption price of 100% of the principal amount of the notes. As provided in the indenture governing the 2032 Notes, prior to July 29, 2014, the noteholders had the right to convert their notes into shares of our common stock at a conversion rate of 18.463 shares per $1,000 principal amount. Substantially all noteholders exercised their conversion right. We paid $252.7 million in cash representing the principal amount of the notes that were converted and issued 1,217,112 shares of our common stock to satisfy the conversion premium. On July 31, 2014, we redeemed any 2032 Notes that were not converted.

Segment_Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 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 area as of and for the periods ended September 30, 2014 and 2013 were (in millions):
		Americas		EMEA		Asia Pacific
	2014
	Revenue - Three months ended	$	2,227.00	$	1,117.50	$	405.1
	Revenue - Nine months ended	6,608.40		3,348.60		1,165.70
	Long-lived assets and goodwill	6,103.90		2,902.10		582.8
	2013
	Revenue - Three months ended	$	2,054.40	$	1,050.80	$	385.3
	Revenue - Nine months ended	6,252.30		3,138.50		1,135.60
	Long-lived assets and goodwill	6,072.40		2,906.10		592.1
	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.

Termination_of_Business_Combin

Termination of Business Combination Agreement	9 Months Ended
	Sep. 30, 2014
Termination of Business Combination Agreement [Abstract]	'
Termination of Business Combination Agreement	'
	Termination of Business Combination Agreement
	On May 8, 2014, the Company and Publicis Groupe S.A. (“Publicis”) entered into a termination agreement (“Termination Agreement”) under which the Company and Publicis mutually agreed to terminate their proposed merger in view of difficulties in completing the transaction within a reasonable timeframe.
	Under the Termination Agreement, the Company and Publicis mutually consented to terminate their Business Combination Agreement, dated July 27, 2013 (“Business Combination Agreement”), governing the proposed combination of the parties’ respective businesses, and mutually agreed to release each other from all claims, obligations and liabilities arising out of, in connection with or relating to the Business Combination Agreement. The Termination Agreement provided that no termination fee was payable by either party.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	Income Taxes
	The effective tax rate for the nine months ended September 30, 2014 reflects the recognition of an income tax benefit of $11.4 million related to previously incurred expenses for the proposed merger with Publicis. On May 8, 2014, the proposed merger with Publicis was terminated. Prior to the termination of the proposed merger, the majority of the merger costs were capitalized for income tax purposes and the related tax benefits were not recorded. Because the proposed merger was terminated, the merger costs were no longer required to be capitalized for income tax purposes.
	In connection with the conversion of the 2032 Notes (see Note 5), we reclassified $66.2 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 $32.2 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.
	At September 30, 2014, our unrecognized tax benefits were $139.3 million. Of this amount, approximately $58.5 million would affect our effective tax rate upon resolution of the uncertain tax positions.

Pension_and_Other_Postemployme

Pension and Other Postemployment Benefits	9 Months Ended
	Sep. 30, 2014
Pension and Other Postemployment Benefits [Abstract]	'
Pension and Other Postemployment Benefits	'
	Pension and Other Postemployment Benefits
	Net periodic benefit cost is included in the salary and service costs component of operating expenses.
	Defined Benefit Pension Plans
	The components of net periodic benefit cost for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	5.5		$	3.3
	Interest cost	5.5			4.6
	Expected return on plan assets	(2.2		)	(2.1		)
	Amortization of prior service cost	3.2			2.7
	Amortization of actuarial (gains) losses	1.4			2.4
		$	13.4		$	10.9
	We contributed $0.7 million and $3.1 million to our defined benefit pension plans in the nine months ended September 30, 2014 and 2013, respectively.
	Postemployment Arrangements
	The components of net periodic benefit cost for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	3		$	3
	Interest cost	3.3			3.3
	Amortization of prior service cost	1.6			1.5
	Amortization of actuarial (gains) losses	0.6			1
		$	8.5		$	8.8

Operating_Expenses

Operating Expenses	9 Months Ended
	Sep. 30, 2014
Operating Expenses [Abstract]	'
Operating Expenses	'
	Operating Expenses
	Operating expenses for the three and nine months ended September 30, 2014 and 2013 were (in millions):
		Three Months				Nine Months
		2014		2013		2014		2013
	Salary and service costs	$	2,813.20	$	2,585.20	$	8,230.70	$	7,733.30
	Office and general expenses	502.8		497.8		1,518.50		1,490.80
	Merger expenses	—		28.1		8.8		28.1
		$	3,316.00	$	3,111.10	$	9,758.00	$	9,252.20
	For the nine months ended September 30, 2014 and 2013, we incurred $8.8 million and $28.1 million, respectively, of expenses in connection with the proposed merger with Publicis, which were primarily comprised of professional fees. On May 8, 2014, the proposed merger with Publicis was terminated.

Supplemental_Cash_Flow_Data

Supplemental Cash Flow Data	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Data [Abstract]	'
Supplemental Cash Flow Data	'
	Supplemental Cash Flow Data
	The change in operating capital for the nine months ended September 30, 2014 and 2013 was (in millions):
		2014			2013
	(Increase) decrease in accounts receivable	$	333.4		$	294
	(Increase) decrease in work in process and other current assets	(333.5		)	(392.8		)
	Increase (decrease) in accounts payable	(738.6		)	(668.9		)
	Increase (decrease) in customer advances and other current liabilities	(237.7		)	97.6
	Change in other assets and liabilities, net	(115.5		)	15.9
		$	(1,091.9	)	$	(654.2	)
	Income taxes paid	$	420.9		$	335.2
	Interest paid	$	147.1		$	134.8
	In connection with the conversion of the 2032 Notes in July 2014 (see Note 5), we issued 1,217,112 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 $89.2 million, excluding the cash tax benefit of $32.2 million.

Commitments_and_Contingent_Lia

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2014
Commitments and Contingent Liabilities [Abstract]	'
Commitments and Contingent Liabilities	'
	Commitments and Contingent Liabilities
	In August 2013, several putative class actions challenging the proposed merger of Omnicom and Publicis were filed on behalf of Omnicom shareholders and named as defendants Omnicom and its board of directors, as well as Publicis and Publicis Omnicom Group. The suits alleged that the members of the Omnicom board breached their fiduciary duties by, among other things, approving a merger that was purportedly detrimental to Omnicom’s shareholders. The actions also alleged that Publicis aided and abetted the Omnicom board’s breach of their fiduciary duties. In October 2013, all the actions were consolidated with each other into one case. On May 8, 2014, the proposed merger of Omnicom and Publicis was terminated. On May 22, 2014, a stipulation of voluntary discontinuance was submitted to the Court. The Court so-ordered the stipulation and dismissed the case on May 23, 2014.
	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	9 Months Ended
	Sep. 30, 2014
Fair Value [Abstract]	'
Fair Value	'
	Fair Value
	Financial assets and liabilities measured at fair value on a recurring basis at September 30, 2014 and December 31, 2013 were (in millions):
	2014		Level 1			Level 2			Level 3			Total
	Assets:
	Cash and cash equivalents		$	837.7								$	837.7
	Short-term investments		12.6									12.6
	Available-for-sale securities		5.2									5.2
	Foreign currency and interest rate derivative instruments					$	5.4					5.4
	Liabilities:
	Foreign currency derivative instruments					$	2.1					$	2.1
	Contingent purchase price obligations								$	241		241
	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
	Foreign currency derivative instruments					$	2.2					2.2
	Liabilities:
	Foreign currency derivative instruments					$	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 nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	1-Jan	$	220.2		$	266.2
	Acquisitions	103.1			34.8
	Revaluation and interest	0.1			(9.5		)
	Payments	(74.5		)	(68.9		)
	Foreign currency translation	(7.9		)	(9.3		)
	30-Sep	$	241		$	213.3
	The carrying amount and fair value of our financial instruments at September 30, 2014 and December 31, 2013 were (in millions):
		2014						2013
		Carrying			Fair			Carrying			Fair
		Amount			Value			Amount			Value
	Assets:
	Cash and cash equivalents	$	837.7		$	837.7		$	2,710.50		$	2,710.50
	Short-term investments	12.6			12.6			18.2			18.2
	Available-for-sale securities	5.2			5.2			4.9			4.9
	Foreign currency and interest rate derivative instruments	5.4			5.4			2.2			2.2
	Cost method investments	23.2			23.2			22.2			22.2
	Liabilities:
	Short-term borrowings	$	31.3		$	31.3		$	5.9		$	5.9
	Foreign currency derivative instruments	2.1			2.1			0.1			0.1
	Contingent interest derivative	—			—			2.1			2.1
	Contingent purchase price obligations	241			241			220.2			220.2
	Debt	3,779.20			3,982.60			4,033.80			4,302.70
	The estimated fair value of the foreign currency and interest rate derivative instruments is determined using model-derived valuations, taking into consideration foreign currency rates for the foreign currency derivatives and readily observable inputs for LIBOR interest rates and yield curves to derive the present value of the future cash flows for the interest rate swap derivatives and counterparty credit risk for each. The estimated fair value of the contingent purchase price obligations is calculated in accordance with the terms of each acquisition agreement and is discounted. The fair value of debt is based on quoted market prices.

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 2014 and 2013 were (in millions):
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	1-Jan-14	$	(1.6	)	$	(68.8	)	$	(121.2	)	$	(191.6	)
	Other comprehensive income (loss) before reclassifications	0.3			—			(232.9		)	(232.6		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—			4.1			—			4.1
	Other comprehensive income (loss)	0.3			4.1			(232.9		)	(228.5		)
	30-Sep-14	$	(1.3	)	$	(64.7	)	$	(354.1	)	$	(420.1	)
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	1-Jan-13	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
	Other comprehensive income (loss) before reclassifications	0.3			—			(95.9		)	(95.6		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—			4.5			—			4.5
	Other comprehensive income (loss)	0.3			4.5			(95.9		)	(91.1		)
	30-Sep-13	$	(1.7	)	$	(85.3	)	$	(133.6	)	$	(220.6	)
	Reclassifications from accumulated other comprehensive income (loss) for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	Amortization of defined benefit pension and postemployment plans:
	Prior service cost	$	4.8		$	4.2
	Actuarial (gains) losses	2			3.4
	Periodic benefit cost (see Note 9)	6.8			7.6
	Income taxes	2.7			3.1
	Periodic benefit cost, net of income taxes	$	4.1		$	4.5

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 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 the unaudited condensed consolidated financial statements.

Net_Income_Per_Common_Share_Ta

Net Income Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2014
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 nine months ended September 30, 2014 and 2013 is (in millions, except per share amounts):
		Three Months						Nine Months
		2014			2013			2014			2013
	Net Income Available for Common Shares:
	Net income - Omnicom Group Inc.	$	243.8		$	196		$	774.5		$	690.7
	Net income allocated to participating securities	(4.3		)	(4.8		)	(14.7		)	(18.1		)
		$	239.5		$	191.2		$	759.8		$	672.6
	Weighted Average Shares:
	Basic	251.4			258.2			255.6			259
	Dilutive stock options, restricted shares and shares issuable for the conversion premium of convertible debt	1			1.7			1.7			1.4
	Diluted	252.4			259.9			257.3			260.4
	Anti-dilutive stock options and restricted shares	—			—			—			0.1
	Net Income per Common Share - Omnicom Group Inc.:
	Basic	$	0.95		$	0.74		$	2.97		$	2.6
	Diluted	$	0.95		$	0.74		$	2.95		$	2.58

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and intangible assets at September 30, 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	$	9,443.80		$	568.6		$	8,875.20	$	9,502.60	$	586.6	$	8,916.00
	Intangible assets:
	Purchased and internally developed software	$	296.2		$	224.6		$	71.6	$	283.2	$	217.4	$	65.8
	Customer related and other	694.4			379			315.4		655.1		334.9		320.2
		$	990.6		$	603.6		$	387	$	938.3	$	552.3	$	386
Changes in Goodwill	'
	Changes in goodwill for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	1-Jan	$	8,916.00		$	8,844.20
	Acquisitions	131.4			55.5
	Dispositions	(1.6		)	(8.5		)
	Foreign currency translation	(170.6		)	(22.2		)
	30-Sep	$	8,875.20		$	8,869.00

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Available and Unused Lines of Credit	'
	Available and unused lines of credit at September 30, 2014 and December 31, 2013 were (in millions):
		2014		2013
	Credit Agreement	$	2,500.00	$	2,500.00
	Uncommitted lines of credit	950.7		1,051.50
	Available and unused lines of credit	$	3,450.70	$	3,551.50
Long-Term Notes Payable [Member]	'
Long-Term Debt	'
	Long-term notes payable at September 30, 2014 and December 31, 2013 were (in millions):
		2014		2013
	5.9% 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	0.3		0.5
		3,750.30		3,750.50
	Unamortized premium (discount) on Senior Notes, net	13.8		14.7
	Adjustment to carrying value for interest rate swaps	15.1		15.9
		3,779.20		3,781.10
	Less current portion	0.3		0.4
	Long-term notes payable	$	3,778.90	$	3,780.70

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2014
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 September 30, 2014 and 2013 were (in millions):
		Americas		EMEA		Asia Pacific
	2014
	Revenue - Three months ended	$	2,227.00	$	1,117.50	$	405.1
	Revenue - Nine months ended	6,608.40		3,348.60		1,165.70
	Long-lived assets and goodwill	6,103.90		2,902.10		582.8
	2013
	Revenue - Three months ended	$	2,054.40	$	1,050.80	$	385.3
	Revenue - Nine months ended	6,252.30		3,138.50		1,135.60
	Long-lived assets and goodwill	6,072.40		2,906.10		592.1

Pension_and_Other_Postemployme1

Pension and Other Postemployment Benefits (Tables)	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	5.5		$	3.3
	Interest cost	5.5			4.6
	Expected return on plan assets	(2.2		)	(2.1		)
	Amortization of prior service cost	3.2			2.7
	Amortization of actuarial (gains) losses	1.4			2.4
		$	13.4		$	10.9
Postemployment Arrangements [Member]	'
Components of Net Periodic Benefit Cost	'
	Postemployment Arrangements
	The components of net periodic benefit cost for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	Service cost	$	3		$	3
	Interest cost	3.3			3.3
	Amortization of prior service cost	1.6			1.5
	Amortization of actuarial (gains) losses	0.6			1
		$	8.5		$	8.8

Operating_Expenses_Tables

Operating Expenses (Tables)	9 Months Ended
	Sep. 30, 2014
Operating Expenses [Abstract]	'
Components of Operating Expenses	'
	Operating expenses for the three and nine months ended September 30, 2014 and 2013 were (in millions):
		Three Months				Nine Months
		2014		2013		2014		2013
	Salary and service costs	$	2,813.20	$	2,585.20	$	8,230.70	$	7,733.30
	Office and general expenses	502.8		497.8		1,518.50		1,490.80
	Merger expenses	—		28.1		8.8		28.1
		$	3,316.00	$	3,111.10	$	9,758.00	$	9,252.20
	For the nine months ended September 30, 2014 and 2013, we incurred $8.8 million and $28.1 million, respectively, of expenses in connection with the proposed merger with Publicis, which were primarily comprised of professional fees. On May 8, 2014, the proposed merger with Publicis was terminated.

Supplemental_Cash_Flow_Data_Ta

Supplemental Cash Flow Data (Tables)	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Data [Abstract]	'
Change in Operating Capital	'
	The change in operating capital for the nine months ended September 30, 2014 and 2013 was (in millions):
		2014			2013
	(Increase) decrease in accounts receivable	$	333.4		$	294
	(Increase) decrease in work in process and other current assets	(333.5		)	(392.8		)
	Increase (decrease) in accounts payable	(738.6		)	(668.9		)
	Increase (decrease) in customer advances and other current liabilities	(237.7		)	97.6
	Change in other assets and liabilities, net	(115.5		)	15.9
		$	(1,091.9	)	$	(654.2	)
	Income taxes paid	$	420.9		$	335.2
	Interest paid	$	147.1		$	134.8
	In connection with the conversion of the 2032 Notes in July 2014 (see Note 5), we issued 1,217,112 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 $89.2 million, excluding the cash tax benefit of $32.2 million.

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2014 and December 31, 2013 were (in millions):
	2014		Level 1			Level 2			Level 3			Total
	Assets:
	Cash and cash equivalents		$	837.7								$	837.7
	Short-term investments		12.6									12.6
	Available-for-sale securities		5.2									5.2
	Foreign currency and interest rate derivative instruments					$	5.4					5.4
	Liabilities:
	Foreign currency derivative instruments					$	2.1					$	2.1
	Contingent purchase price obligations								$	241		241
	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
	Foreign currency derivative instruments					$	2.2					2.2
	Liabilities:
	Foreign currency derivative instruments					$	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 nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	1-Jan	$	220.2		$	266.2
	Acquisitions	103.1			34.8
	Revaluation and interest	0.1			(9.5		)
	Payments	(74.5		)	(68.9		)
	Foreign currency translation	(7.9		)	(9.3		)
	30-Sep	$	241		$	213.3
Carrying Amounts and Fair Value of Financial Instruments	'
	The carrying amount and fair value of our financial instruments at September 30, 2014 and December 31, 2013 were (in millions):
		2014						2013
		Carrying			Fair			Carrying			Fair
		Amount			Value			Amount			Value
	Assets:
	Cash and cash equivalents	$	837.7		$	837.7		$	2,710.50		$	2,710.50
	Short-term investments	12.6			12.6			18.2			18.2
	Available-for-sale securities	5.2			5.2			4.9			4.9
	Foreign currency and interest rate derivative instruments	5.4			5.4			2.2			2.2
	Cost method investments	23.2			23.2			22.2			22.2
	Liabilities:
	Short-term borrowings	$	31.3		$	31.3		$	5.9		$	5.9
	Foreign currency derivative instruments	2.1			2.1			0.1			0.1
	Contingent interest derivative	—			—			2.1			2.1
	Contingent purchase price obligations	241			241			220.2			220.2
	Debt	3,779.20			3,982.60			4,033.80			4,302.70

Changes_in_Accumulated_Other_C1

Changes in Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 2014 and 2013 were (in millions):
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	1-Jan-14	$	(1.6	)	$	(68.8	)	$	(121.2	)	$	(191.6	)
	Other comprehensive income (loss) before reclassifications	0.3			—			(232.9		)	(232.6		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—			4.1			—			4.1
	Other comprehensive income (loss)	0.3			4.1			(232.9		)	(228.5		)
	30-Sep-14	$	(1.3	)	$	(64.7	)	$	(354.1	)	$	(420.1	)
		Unrealized Gain (Loss) on Available-for-Sale Securities			Defined Benefit Pension and Postemployment Plans			Foreign Currency Translation			Total
	1-Jan-13	$	(2.0	)	$	(89.8	)	$	(37.7	)	$	(129.5	)
	Other comprehensive income (loss) before reclassifications	0.3			—			(95.9		)	(95.6		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—			4.5			—			4.5
	Other comprehensive income (loss)	0.3			4.5			(95.9		)	(91.1		)
	30-Sep-13	$	(1.7	)	$	(85.3	)	$	(133.6	)	$	(220.6	)
Reclassifications from accumulated other comprehensive income (loss)	'
	Reclassifications from accumulated other comprehensive income (loss) for the nine months ended September 30, 2014 and 2013 were (in millions):
		2014			2013
	Amortization of defined benefit pension and postemployment plans:
	Prior service cost	$	4.8		$	4.2
	Actuarial (gains) losses	2			3.4
	Periodic benefit cost (see Note 9)	6.8			7.6
	Income taxes	2.7			3.1
	Periodic benefit cost, net of income taxes	$	4.1		$	4.5

Net_Income_Per_Common_Share_De

Net Income Per Common Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income Available for Common Shares:	'	'	'	'
Net income - Omnicom Group Inc.	$243.80	$196	$774.50	$690.70
Net income allocated to participating securities	-4.3	-4.8	-14.7	-18.1
Net income available for common shares	$239.50	$191.20	$759.80	$672.60
Weighted Average Shares:	'	'	'	'
Basic	251.4	258.2	255.6	259
Dilutive stock options, restricted shares and shares issuable for the conversion premium of convertible debt	1	1.7	1.7	1.4
Diluted	252.4	259.9	257.3	260.4
Anti-dilutive stock options and restricted shares	0	0	0	0.1
Net Income per Common Share - Omnicom Group Inc.:	'	'	'	'
Basic	$0.95	$0.74	$2.97	$2.60
Diluted	$0.95	$0.74	$2.95	$2.58

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Goodwill, Gross Carrying Value	$9,443.80	'	$9,502.60
Goodwill, Accumulated Amortization	568.6	'	586.6
Goodwill, Net Carrying Value	8,875.20	8,869	'
Intangible assets:, Gross Carrying Value	990.6	'	938.3
Intangible assets:, Accumulated Amortization	603.6	'	552.3
Intangible assets:, Net Carrying Value	387	'	386
Goodwill [Roll Forward]	'	'	'
Goodwill, January 1	8,916	8,844.20	'
Goodwill, Acquisitions	131.4	55.5	'
Goodwill, Dispositions	-1.6	-8.5	'
Goodwill, Foreign currency translation	-170.6	-22.2	'
Goodwill, September 30	8,875.20	8,869	'
Goodwill, impairment losses	0	'	'
Goodwill, accumulated impairment losses	0	'	'
Goodwill, acquisitions of noncontrolling interests	27.6	9.2	'
Purchased and internally developed software	'	'	'
Intangible assets:, Gross Carrying Value	296.2	'	283.2
Intangible assets:, Accumulated Amortization	224.6	'	217.4
Intangible assets:, Net Carrying Value	71.6	'	65.8
Customer related and other	'	'	'
Intangible assets:, Gross Carrying Value	694.4	'	655.1
Intangible assets:, Accumulated Amortization	379	'	334.9
Intangible assets:, Net Carrying Value	$315.40	'	$320.20

Debt_Details

Debt (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Lines of Credit [Abstract]	'	'
Available and unused lines of credit	$3,450,700,000	$3,551,500,000
Short-Term Borrowings [Abstract]	'	'
Short-term borrowings	31,300,000	5,900,000
Long-Term Notes Payable [Abstract]	'	'
Long-term notes payable, carrying amount	3,750,300,000	3,750,500,000
Unamortized premium (discount) on Senior Notes, net	13,800,000	14,700,000
Adjustment to carrying value for interest rate swaps	15,100,000	15,900,000
Long-term notes payable, total	3,779,200,000	3,781,100,000
Long-term notes payable, current portion	300,000	400,000
Long-Term Notes Payable	3,778,900,000	3,780,700,000
Convertible Debt [Abstract]	'	'
Convertible Debt	0	252,700,000
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Convertible Debt, Shares Issued for Conversion Premium	1,217,112	'
Credit Agreement expiring October 2016 [Member]	'	'
Lines of Credit [Abstract]	'	'
Credit Agreement, maximum borrowing capacity	2,500,000,000	'
Credit Agreement, expiration date	31-Jul-19	'
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 of 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 September 30, 2014, we were in compliance with these covenants, as our Leverage Ratio was 1.7 times and our Interest Coverage Ratio was 12 times.	'
Credit Agreement expiring October 2016 [Member] | Commercial Paper [Member]	'	'
Lines of Credit [Abstract]	'	'
Credit Agreement, maximum borrowing capacity	2,000,000,000	'
Uncommitted lines of credit [Member]	'	'
Lines of Credit [Abstract]	'	'
Available and unused lines of credit	950,700,000	1,051,500,000
5.9% 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	300,000	500,000
Convertible Notes due July 31, 2032	'	'
Convertible Debt [Abstract]	'	'
Convertible Debt	0	252,700,000
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Convertible Debt, Call Date	5-Jun-14	'
Convertible Debt, Repurchase Date	31-Jul-14	'
Convertible Debt, Percentage of Principal Amount Redeemed	100.00%	'
Convertible Debt, Latest Conversion Date	29-Jul-14	'
Convertible Debt, Conversion Rate	18.463	'
Convertible Debt, Principle Amount Settled in Cash	252,700,000	'
Convertible Debt, Shares Issued for Conversion Premium	1,217,112	'
Interest Rate Swaps on 2022 Notes [Member]	'	'
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest Rate Swaps, Inception Date	1-May-14	'
Interest Rate Swaps, Amount of Hedged Item	1,250,000,000	'
Interest Rate Swaps on 2020 Notes [Member]	'	'
Long-Term Notes Payable and Convertible Debt [Abstract]	'	'
Interest Rate Swaps, Inception Date	29-Sep-14	'
Interest Rate Swaps, Amount of Hedged Item	$1,000,000,000	'

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$3,749.60	$3,490.50	$11,122.70	$10,526.40
Americas	'	'	'	'
Revenue	2,227	2,054.40	6,608.40	6,252.30
Long-lived assets and goodwill	6,103.90	6,072.40	6,103.90	6,072.40
EMEA	'	'	'	'
Revenue	1,117.50	1,050.80	3,348.60	3,138.50
Long-lived assets and goodwill	2,902.10	2,906.10	2,902.10	2,906.10
Asia Pacific	'	'	'	'
Revenue	405.1	385.3	1,165.70	1,135.60
Long-lived assets and goodwill	$582.80	$592.10	$582.80	$592.10

Termination_of_Business_Combin1

Termination of Business Combination Agreement (Details)	9 Months Ended
	Sep. 30, 2014
Date of Termination of Business Combination Agreement	8-May-14
Date of Business Combination Agreement	27-Jul-13

Income_Taxes_Details

Income Taxes (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Income Taxes [Abstract]	'
Income tax benefit, merger expenses	$11.40
Current Taxes Payable, Conversion of Convertible Debt	66.2
Adjustment to Additional Paid-In Capital, Conversion of Convertible Debt	32.2
Unrecognized tax benefits	139.3
Unrecognized tax benefits that would impact effective tax rate	$58.50

Pension_and_Other_Postemployme2

Pension and Other Postemployment Benefits (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Pension Plans [Member]	'	'
Components of Net Periodic Benefit Cost [Abstract]	'	'
Service cost	$5.50	$3.30
Interest cost	5.5	4.6
Expected return on plan assets	-2.2	-2.1
Amortization of prior service cost	3.2	2.7
Amortization of actuarial (gains) losses	1.4	2.4
Net periodic benefit cost	13.4	10.9
Defined benefit pension plans, contributions by employer	0.7	3.1
Postemployment Arrangements [Member]	'	'
Components of Net Periodic Benefit Cost [Abstract]	'	'
Service cost	3	3
Interest cost	3.3	3.3
Amortization of prior service cost	1.6	1.5
Amortization of actuarial (gains) losses	0.6	1
Net periodic benefit cost	$8.50	$8.80

Operating_Expenses_Details

Operating Expenses (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Expenses [Abstract]	'	'	'	'
Salary and service costs	$2,813.20	$2,585.20	$8,230.70	$7,733.30
Office and general expenses	502.8	497.8	1,518.50	1,490.80
Merger expenses	0	28.1	8.8	28.1
Operating expenses	$3,316	$3,111.10	$9,758	$9,252.20

Supplemental_Cash_Flow_Data_De

Supplemental Cash Flow Data (Details) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Change in Operating Capital [Abstract]	'	'
(Increase) decrease in accounts receivable	$333.40	$294
(Increase) decrease in work in process and other current assets	-333.5	-392.8
Increase (decrease) in accounts payable	-738.6	-668.9
Increase (decrease) in customer advances and other current liabilities	-237.7	97.6
Change in other assets and liabilities, net	-115.5	15.9
Change in operating capital	-1,091.90	-654.2
Income taxes paid	420.9	335.2
Interest paid	147.1	134.8
Convertible Debt, Shares Issued for Conversion Premium	1,217,112	'
Convertible Debt, Fair Value of Common Stock Issued	89.2	'
Adjustment to Additional Paid-In Capital, Conversion of Convertible Debt	$32.20	'

Fair_Value_Details

Fair Value (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 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, 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

$837.70

$2,710.50

'

'

'

'

$837.70

$2,710.50

$837.70

$2,710.50

'

'

'

'

$837.70

$2,710.50

Short-term investments

12.6

18.2

'

'

'

'

12.6

18.2

12.6

18.2

'

'

'

'

12.6

18.2

Available-for-sale securities

5.2

4.9

'

'

'

'

5.2

4.9

5.2

4.9

'

'

'

'

5.2

4.9

Foreign currency and interest rate derivative instruments

5.4

2.2

'

'

'

'

5.4

2.2

'

'

5.4

'

'

'

5.4

'

Foreign currency derivative instruments

'

'

'

'

'

'

'

'

'

'

'

2.2

'

'

'

2.2

Cost method investments

23.2

22.2

'

'

'

'

23.2

22.2

'

'

'

'

'

'

'

'

Liabilities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Short-term borrowings

31.3

5.9

'

'

'

'

31.3

5.9

'

'

'

'

'

'

'

'

Foreign currency derivative instruments

2.1

0.1

'

'

'

'

2.1

0.1

'

'

2.1

0.1

'

'

2.1

0.1

Contingent interest derivative

0

2.1

'

'

'

'

0

2.1

'

'

'

2.1

'

'

'

2.1

Contingent purchase price obligations

241

220.2

'

'

'

'

241

220.2

'

'

'

'

241

220.2

241

220.2

Debt

3,982.60

4,302.70

'

'

'

'

3,779.20

4,033.80

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1-Jan

'

'

220.2

266.2

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions

'

'

103.1

34.8

'

'

'

'

'

'

'

'

'

'

'

'

Revaluation and interest

'

'

'

'

0.1

-9.5

'

'

'

'

'

'

'

'

'

'

Payments

'

'

-74.5

-68.9

'

'

'

'

'

'

'

'

'

'

'

'

Foreign currency translation

'

'

-7.9

-9.3

'

'

'

'

'

'

'

'

'

'

'

'

30-Sep

'

'

$241

$213.30

'

'

'

'

'

'

'

'

'

'

'

'

Changes_in_Accumulated_Other_C2

Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
1-Jan-14	($191.60)	($129.50)
Other comprehensive income (loss) before reclassifications	-232.6	-95.6
Amounts reclassified from accumulated other comprehensive income (loss)	4.1	4.5
Other comprehensive income (loss)	-228.5	-91.1
30-Sep-14	-420.1	-220.6
Unrealized Gain (Loss) on Available-for-Sale Securities	'	'
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
1-Jan-14	-1.6	-2
Other comprehensive income (loss) before reclassifications	0.3	0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	0.3	0.3
30-Sep-14	-1.3	-1.7
Defined Benefit Pension and Postemployment Plans	'	'
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
1-Jan-14	-68.8	-89.8
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	4.1	4.5
Other comprehensive income (loss)	4.1	4.5
30-Sep-14	-64.7	-85.3
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	4.8	4.2
Actuarial (gains) losses	2	3.4
Periodic benefit cost (see Note 9)	6.8	7.6
Income taxes	2.7	3.1
Periodic benefit cost, net of income taxes	4.1	4.5
Foreign Currency Translation	'	'
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'
1-Jan-14	-121.2	-37.7
Other comprehensive income (loss) before reclassifications	-232.9	-95.9
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	-232.9	-95.9
30-Sep-14	($354.10)	($133.60)