Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income	$ 278.2	$ 266.7	$ 866.3	$ 839.2
Forward-starting interest rate swap adjustment, net of income taxes of $0.6 and ($21.2) for the three months and ($19.2) and ($6.6) for the nine months ended September 30, 2016 and 2015, respectively	0.8	(29.7)	(27.0)	(9.2)
Unrealized gain on available-for-sale securities, net of income taxes of $0.1 for the nine months ended September 30, 2015	0.1	0.1	0.1	0.3
Foreign currency translation adjustment, net of income taxes of ($16.0) and ($109.4) for the three months and ($18.8) and ($203.7) for the nine months ended September 30, 2016 and 2015, respectively	(31.1)	(212.6)	(36.2)	(395.7)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $1.3 and $1.4 for the three months and $3.9 and $4.4 for the nine months ended September 30, 2016 and 2015, respectively	1.9	2.2	6.0	6.6
Other Comprehensive Income (Loss)	(28.3)	(240.0)	(57.1)	(398.0)
Comprehensive Income	249.9	26.7	809.2	441.2
Comprehensive Income Attributed to Noncontrolling Interests	24.3	9.8	85.2	42.3
Comprehensive Income - Omnicom Group Inc.	$ 225.6	$ 16.9	$ 724.0	$ 398.9