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Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Ownership Interests in Less Than 100% Owned Subsidiaries [Abstract]
Net income attributed to Omnicom Group Inc.	$ 329.5us-gaap_NetIncomeLoss	$ 243.8us-gaap_NetIncomeLoss	$ 325.2us-gaap_NetIncomeLoss	$ 205.5us-gaap_NetIncomeLoss	$ 300.5us-gaap_NetIncomeLoss	$ 196.0us-gaap_NetIncomeLoss	$ 289.5us-gaap_NetIncomeLoss	$ 205.1us-gaap_NetIncomeLoss	$ 1,104.0us-gaap_NetIncomeLoss	$ 991.1us-gaap_NetIncomeLoss	$ 998.3us-gaap_NetIncomeLoss
Increase in additional paid-in capital from sale of shares in noncontrolling interests									6.3	5.2	2.6
Decrease in additional paid-in capital from purchase of shares in noncontrolling interests									(70.8)	(22.0)	(30.7)
Net transfers (to) from noncontrolling interests									(64.5)	(16.8)	(28.1)
Change from net income attributed to Omnicom Group Inc. and transfers (to) from noncontrolling interests									$ 1,039.5	$ 974.3	$ 970.2

This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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