Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Income	$ 224.7	$ 233.6	$ 771.2	$ 773.9
Unrealized gain on available-for-sale securities, net of income taxes of $0.2 for the nine months ended September 30, 2013	0	0	0.3	0
Foreign currency translation adjustment, net of income taxes of $94.4 and $53.2 for the three months and ($63.6) and $36.9 for the nine months ended September 30, 2013 and 2012, respectively	183.4	103.2	(123.3)	71.3
Defined benefit pension and postemployment plans adjustment, net of income taxes of $0.7 and $0.9 for the three months and $3.1 and $2.5 for the nine months ended September 30, 2013 and 2012, respectively	1.1	1.3	4.5	3.7
Other Comprehensive Income	184.5	104.5	(118.5)	75.0
Comprehensive Income	409.2	338.1	652.7	848.9
Less: Comprehensive Income attributed to noncontrolling interests	36.4	38.7	53.1	86.7
Comprehensive Income - Omnicom Group Inc.	$ 372.8	$ 299.4	$ 599.6	$ 762.2