Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue	$ 14,219.4	$ 13,872.5	$ 12,542.5
Operating Expenses	12,415.2	12,201.4	11,082.3
Operating Income	1,804.2	1,671.1	1,460.2
Interest Expense	179.7	158.1	134.7
Interest Income	35.1	36.0	24.9
Income Before Income Taxes and Income (Loss) From Equity Method Investments	1,659.6	1,549.0	1,350.4
Income Tax Expense	527.1	505.8	460.2
Income (Loss) From Equity Method Investments	(15.0)	17.2	33.5
Net Income	1,117.5	1,060.4	923.7
Less: Net Income Attributed To Noncontrolling Interests	119.2	107.8	96.0
Net Income - Omnicom Group Inc.	$ 998.3	$ 952.6	$ 827.7
Net Income Per Share - Omnicom Group Inc.:
Basic	$ 3.64	$ 3.38	$ 2.74
Diluted	$ 3.61	$ 3.33	$ 2.70