Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 226.0	$ 217.1
Foreign currency transaction and translation adjustments, net of income taxes of $49.8 and $65.8 for the three months ended March 31, 2012 and 2011, respectively	96.7	127.8
Defined benefit plans adjustment, net of income taxes of $0.7 and $0.6 for the three months ended March 31, 2012 and 2011, respectively	1.1	0.9
Other Comprehensive Income	97.8	128.7
Comprehensive Income	323.8	345.8
Less: Comprehensive Income attributed to noncontrolling interests	23.6	22.8
Comprehensive Income - Omnicom Group Inc.	$ 300.2	$ 323.0