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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2011
Quarterly Results of Operations (Unaudited) [Abstract] |
Quarterly Results of Operations (Unaudited) [Table Text Block] | The Company’s unaudited quarterly results of operations for the years ended December 31, 2011 and 2010 were (in millions, except for per share amounts):
| Quarter
| First |  | Second |  | Third |  | Fourth
Revenue |  |  |  |  |  |  |
2011 | $ | 3,151.3 |  |  | $ | 3,487.4 |  |  | $ | 3,380.9 |  |  | $ | 3,852.9 |
2010 | 2,920.0 |  |  | 3,041.2 |  |  | 2,994.6 |  |  | 3,586.7 |
Operating Expenses |  |  |  |  |  |  |
2011 | 2,829.2 |  |  | 2,999.3 |  |  | 3,007.5 |  |  | 3,365.5 |
2010 | 2,629.0 |  |  | 2,625.8 |  |  | 2,680.5 |  |  | 3,147.0 |
Operating Income |  |  |  |  |  |  |
2011 | 322.1 |  |  | 488.1 |  |  | 373.4 |  |  | 487.4 |
2010 | 291.0 |  |  | 415.4 |  |  | 314.1 |  |  | 439.7 |
Net Income - Omnicom Group Inc. |  |  |  |  |  |  |
2011 | 201.9 |  |  | 275.1 |  |  | 203.7 |  |  | 271.9 |
2010 | 163.4 |  |  | 243.3 |  |  | 174.6 |  |  | 246.4 |
Net Income Per Share Omnicom Group Inc. - Basic |  |  |  |  |  |  |
2011 | 0.70 |  |  | 0.98 |  |  | 0.73 |  |  | 0.97 |
2010 | 0.53 |  |  | 0.80 |  |  | 0.58 |  |  | 0.84 |
Net Income Per Share Omnicom Group Inc. - Diluted |  |  |  |  |  |  |
2011 | 0.69 |  |  | 0.96 |  |  | 0.72 |  |  | 0.96 |
2010 | 0.52 |  |  | 0.79 |  |  | 0.57 |  |  | 0.83 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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