Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income	$ 273.6	$ 224.7	$ 860.1	$ 771.2
Unrealized gain (loss) on available-for-sale securities, net of income taxes of $0.2 and $0.2 for the nine months ended September 30, 2014 and 2013, respectively	0.1	0	0.3	0.3
Foreign currency translation adjustment, net of income taxes of ($181.7) and $94.4 for the three months and ($128.4) and ($63.6) for the nine months ended September 30, 2014 and 2013, respectively	(352.6)	183.4	(249.3)	(123.3)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $0.9 and $0.7 for the three months and $2.7 and $3.1 for the nine months ended September 30, 2014 and 2013, respectively	1.3	1.1	4.1	4.5
Other Comprehensive Income (Loss)	(351.2)	184.5	(244.9)	(118.5)
Comprehensive Income	(77.6)	409.2	615.2	652.7
Comprehensive Income Attributed to Noncontrolling Interests	(2.2)	(36.4)	(69.2)	(53.1)
Comprehensive Income - Omnicom Group Inc.	$ (79.8)	$ 372.8	$ 546.0	$ 599.6