Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue	$ 3,307.3	$ 3,151.3
Operating Expenses	2,944.8	2,829.2
Operating Income	362.5	322.1
Interest Expense	38.5	41.9
Interest Income	9.3	9.8
Income Before Income Taxes and Income From Equity Method Investments	333.3	290.0
Income Tax Expense	109.3	73.9
Income From Equity Method Investments	2.0	1.0
Net Income	226.0	217.1
Less: Net Income Attributed To Noncontrolling Interests	21.4	15.2
Net Income - Omnicom Group Inc.	$ 204.6	$ 201.9
Net Income Per Share - Omnicom Group Inc.:
Basic	$ 0.73	$ 0.70
Diluted	$ 0.72	$ 0.69
Dividends Declared Per Common Share	$ 0.30	$ 0.25