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Noncontrolling Interests
 12 Months Ended
Dec. 31, 2023
Noncontrolling Interests [Abstract]  
Noncontrolling Interests Noncontrolling Interests
Changes in the ownership interests in our less than 100% owned subsidiaries:
Year Ended December 31,
202320222021
Net income attributed to Omnicom Group Inc.$1,391.4 $1,316.5 $1,407.8 
Net transfers (to) from noncontrolling interests(88.1)(17.1)(12.2)
Change from net income attributed to Omnicom Group Inc. and
       transfers (to) from noncontrolling interests		$1,303.3 $1,299.4 $1,395.6