Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue	$ 14,584.5	$ 14,219.4	$ 13,872.5
Operating Expenses	12,759.2	12,415.2	12,201.4
Operating Income	1,825.3	1,804.2	1,671.1
Interest Expense	197.2	179.7	158.1
Interest Income	32.8	35.1	36.0
Income Before Income Taxes and Income (Loss) From Equity Method Investments	1,660.9	1,659.6	1,549.0
Income Tax Expense	565.2	527.1	505.8
Income (Loss) From Equity Method Investments	15.9	(15.0)	17.2
Net Income	1,111.6	1,117.5	1,060.4
Net Income Attributed To Noncontrolling Interests	(120.5)	(119.2)	(107.8)
Net Income - Omnicom Group Inc.	$ 991.1	$ 998.3	$ 952.6
Net Income Per Share - Omnicom Group Inc.:
Basic	$ 3.73	$ 3.64	$ 3.38
Diluted	$ 3.71	$ 3.61	$ 3.33