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Noncontrolling Interests
12 Months Ended
Dec. 31, 2019
Noncontrolling Interests [Abstract]  
Noncontrolling Interests Noncontrolling Interests
Changes in the ownership interests in our less than 100% owned subsidiaries were (in millions):
Year Ended December 31,
201920182017
Net income attributed to Omnicom Group Inc.
$1,339.1  $1,326.4  $1,088.4  
Transfers (to) from noncontrolling interests:
         
Increase in additional paid-in capital from sale of shares in noncontrolling interests
—  4.4  1.8  
Decrease in additional paid-in capital from purchase of shares in noncontrolling interests
(22.3) (44.1) (27.5) 
Net transfers (to) from noncontrolling interests
(22.3) (39.7) (25.7) 
Change from net income attributed to Omnicom Group Inc. and
       transfers (to) from noncontrolling interests
$1,316.8  $1,286.7  $1,062.7