Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue	$ 15,317.8	$ 14,584.5	$ 14,219.4
Operating Expenses	13,373.7	12,759.2	12,415.2
Operating Income	1,944.1	1,825.3	1,804.2
Interest Expense	177.2	197.2	179.7
Interest Income	43.1	32.8	35.1
Income Before Income Taxes and Income (Loss) From Equity Method Investments	1,810.0	1,660.9	1,659.6
Income Tax Expense	593.1	565.2	527.1
Income (Loss) From Equity Method Investments	16.2	15.9	(15.0)
Net Income	1,233.1	1,111.6	1,117.5
Net Income Attributed To Noncontrolling Interests	129.1	120.5	119.2
Net Income - Omnicom Group Inc.	$ 1,104.0	$ 991.1	$ 998.3
Net Income Per Share - Omnicom Group Inc.:
Basic	$ 4.27	$ 3.73	$ 3.64
Diluted	$ 4.24	$ 3.71	$ 3.61
Dividends Declared Per Common Share	$ 1.90	$ 1.60	$ 1.20