Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 1,111.6	$ 1,117.5	$ 1,060.4
Unrealized gain (loss) on available-for-sale securities, net of income taxes of $0.2 and $0.2 and ($0.4) for 2013, 2012 and 2011, respectively	0.4	0.3	(0.6)
Foreign currency translation adjustment, net of income taxes of ($62.3) and $41.3 and ($41.2) for 2013, 2012 and 2011, respectively	(120.6)	80.3	(79.7)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $14.1 and ($14.5) and ($9.1) for 2013, 2012 and 2011, respectively	21.0	(21.7)	(13.6)
Other Comprehensive Income (Loss)	(99.2)	58.9	(93.9)
Comprehensive Income	1,012.4	1,176.4	966.5
Comprehensive Income Attributed To Noncontrolling Interests	(83.4)	(115.9)	(99.2)
Comprehensive Income - Omnicom Group Inc.	$ 929.0	$ 1,060.5	$ 867.3