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Net Income per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2011
Net Income per Common Share [Abstract] |
Computations of Basic and Diluted Net Income per Common Share - Omnicom Group Inc. [Table Text Block] | The computations of basic and diluted net income per common share - Omnicom Group Inc. for the three years ended December 31, 2011 were (in millions, except per share amounts):
| 2011 |  | 2010 |  | 2009
Net Income Available for Common Shares: |  |  |  |  |
Net income - Omnicom Group Inc. | $ | 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: |  |  |  |  |
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.: |  |  |  |  |
Basic | $ | 3.38 |  |  | $ | 2.74 |  |  | $ | 2.54 |
Diluted | $ | 3.33 |  |  | $ | 2.70 |  |  | $ | 2.53 |

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