Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 314.2	$ 307.2	$ 540.2	$ 524.4
Foreign currency transactions and translation adjustments, net of income taxes of ($66.2) and $32.4 for the three months and ($16.4) and $98.3 for the six months ended June 30, 2012 and 2011, respectively	(128.5)	63.0	(31.8)	190.7
Defined benefit plans adjustment, net of income taxes of $0.9 and $0.6 for the three months and $1.6 and $1.2 for the six months ended June 30, 2012 and 2011, respectively	1.3	0.9	2.4	1.8
Other Comprehensive Income	(127.2)	63.9	(29.4)	192.5
Comprehensive Income	187.0	371.1	510.8	716.9
Less: Comprehensive Income attributed to noncontrolling interests	24.4	36.8	48.0	59.6
Comprehensive Income - Omnicom Group Inc.	$ 162.6	$ 334.3	$ 462.8	$ 657.3