Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue	$ 3,870.9	$ 3,637.0	$ 7,373.0	$ 7,035.9
Operating Expenses	3,322.5	3,114.0	6,441.9	6,141.1
Operating Income	548.4	523.0	931.1	894.8
Interest Expense	45.5	49.2	93.1	98.2
Interest Income	11.8	8.5	20.4	16.5
Income Before Income Taxes and Income From Equity Method Investments	514.7	482.3	858.4	813.1
Income Tax Expense	160.3	163.6	276.5	272.7
Income From Equity Method Investments	4.0	2.9	4.6	6.1
Net Income	358.4	321.6	586.5	546.5
Net Income Attributed To Noncontrolling Interests	(33.2)	(32.1)	(55.8)	(51.8)
Net Income - Omnicom Group Inc.	$ 325.2	$ 289.5	$ 530.7	$ 494.7
Net Income Per Share - Omnicom Group Inc.:
Basic	$ 1.24	$ 1.09	$ 2.02	$ 1.86
Diluted	$ 1.23	$ 1.09	$ 2.00	$ 1.85
Dividends Declared Per Common Share	$ 0.50	$ 0.40	$ 0.90	$ 0.80