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Noncontrolling Interests
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interests [Abstract]  
Noncontrolling Interests
Noncontrolling Interests

Changes in the ownership interests in our less than 100% owned subsidiaries for the three years ended December 31, 2017 were (in millions):
 
2017
 
2016
 
2015
Net income attributed to Omnicom Group Inc.
$
1,088.4

 
$
1,148.6

 
$
1,093.9

Transfers (to) from noncontrolling interests:
 
 
 
 
 
Increase in additional paid-in capital from sale of shares in noncontrolling interests
1.8

 
2.0

 
1.7

Decrease in additional paid-in capital from purchase of shares in noncontrolling interests
(27.5
)
 
(89.7
)
 
(40.5
)
Net transfers (to) from noncontrolling interests
(25.7
)
 
(87.7
)
 
(38.8
)
Change from net income attributed to Omnicom Group Inc. and
       transfers (to) from noncontrolling interests
$
1,062.7

 
$
1,060.9

 
$
1,055.1