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Net Income per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Income Available for Common Shares [Abstract]                      
Net Income - Omnicom Group Inc. $ 271.9 $ 203.7 $ 275.1 $ 201.9 $ 246.4 $ 174.6 $ 243.3 $ 163.4 $ 952.6 $ 827.7 $ 793.0
Net income allocated to participating securities                 (10.7) (8.0) (9.1)
Net income available for common shares                 $ 941.9 $ 819.7 $ 783.9
Weighted Average Shares [Abstract]                      
Basic                 279.0 299.6 308.2
Dilutive stock options and restricted shares                 4.3 3.9 2.2
Diluted                 283.3 303.5 310.4
Anti-dilutive stock options and restricted shares                 1.7 3.0 10.9
Net Income per Common Share - Omnicom Group Inc. [Abstract]                      
Basic $ 0.97 $ 0.73 $ 0.98 $ 0.70 $ 0.84 $ 0.58 $ 0.80 $ 0.53 $ 3.38 $ 2.74 $ 2.54
Diluted $ 0.96 $ 0.72 $ 0.96 $ 0.69 $ 0.83 $ 0.57 $ 0.79 $ 0.52 $ 3.33 $ 2.70 $ 2.53