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Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2011
Noncontrolling Interests [Abstract]  
Changes in Ownership Interests in Less than 100% Owned Subsidiaries [Table Text Block]
Changes in our ownership interests in our less than 100% owned subsidiaries during the three years ended December 31, 2011, were (in millions):
 
2011
 
2010
 
2009
 
 
 
 
 
 
Net income attributed to Omnicom Group Inc.
$
952.6

 
$
827.7

 
$
793.0

Transfers (to) from noncontrolling interests:
 
 
 
 
 
Increase in additional paid-in capital from sale
 
 
 
 
 
of shares in noncontrolling interests
4.8

 
2.2

 
—

Decrease in additional paid-in capital from purchase
 
 
 
 
 
of shares in noncontrolling interests
(37.6
)
 
(26.0
)
 
(25.6
)
 
 
 
 
 
 
 
 
 
 
 
 
Net transfers (to) from noncontrolling interests
(32.8
)
 
(23.8
)
 
(25.6
)
 
 
 
 
 
 
 
 
 
 
 
 
Changes in net income attributed to Omnicom Group Inc.
 
 
 
 
 
and transfers (to) from noncontrolling interests
$
919.8

 
$
803.9

 
$
767.4