Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Income	$ 228.0	$ 224.8
Unrealized gain (loss) on available-for-sale securities, net of income taxes of $0.1 and $0.1 for the three months ended March 31, 2014 and 2013, respectively	0.1	0.2
Foreign currency translation adjustment, net of income taxes of $15.6 and ($94.5) for the three months ended March 31, 2014 and 2013, respectively	30.2	(183.3)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $0.9 and $1.3 for the three months ended March 31, 2014 and 2013, respectively	1.4	1.7
Other Comprehensive Income	31.7	(181.4)
Comprehensive Income	259.7	43.4
Comprehensive Income Attributed to Noncontrolling Interests	(32.3)	(9.2)
Comprehensive Income - Omnicom Group Inc.	$ 227.4	$ 34.2