Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income	$ 351.9	$ 342.7	$ 588.2	$ 572.5
Gain (loss) on forward-starting interest rate swap, net of income taxes of $0.5 and $16.4 for the three months and ($19.9) and $14.6 for the six months ended June 30, 2016 and 2015, respectively	0.7	23.0	(27.8)	20.5
Unrealized gain on available-for-sale securities, net of income taxes of $0.1 for the six months ended June 30, 2015	0.0	0.0	0.0	0.2
Foreign currency translation adjustment, net of income taxes of ($61.0) and $81.5 for the three months and ($2.8) and ($94.3) for the six months ended June 30, 2016 and 2015, respectively	(118.3)	158.2	(5.2)	(183.1)
Defined benefit pension and postemployment plans adjustment, net of income taxes of $1.2 and $1.5 for the three months and $2.4 and $3.0 for the six months ended June 30, 2016 and 2015, respectively	1.8	2.2	4.1	4.4
Other Comprehensive Income (Loss)	(115.8)	183.4	(28.9)	(158.0)
Comprehensive Income	236.1	526.1	559.3	414.5
Comprehensive Income Attributed to Noncontrolling Interests	22.2	34.7	60.9	32.5
Comprehensive Income - Omnicom Group Inc.	$ 213.9	$ 491.4	$ 498.4	$ 382.0