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Net Income per Common Share | 12 Months Ended
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Dec. 31, 2011
Net Income per Common Share [Abstract] |
Net Income per Common Share | Net Income per Common Share 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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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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