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Net Income per Share | 12 Months Ended
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Dec. 31, 2017
Net Income per Share [Abstract] |
Net Income per Share | Net Income per Share The computations of basic and diluted net income per share for the three years ended December 31, 2017 were (in millions, except per share amounts):
| 2017 |  | 2016 |  | 2015
Net Income Available for Common Shares: |  |  |  |  |
Net income - Omnicom Group Inc. | $ | 1,088.4 |  |  | $ | 1,148.6 |  |  | $ | 1,093.9 |
Net income allocated to participating securities | (1.6 | ) |  | (6.5 | ) |  | (12.4 | )
| $ | 1,086.8 |  |  | $ | 1,142.1 |  |  | $ | 1,081.5 |
Weighted Average Shares: |  |  |  |  |
Basic | 232.3 |  |  | 237.9 |  |  | 244.2 |
Dilutive stock options and restricted shares | 1.6 |  |  | 1.3 |  |  | 1.0 |
Diluted | 233.9 |  |  | 239.2 |  |  | 245.2 |
Anti-dilutive stock options and restricted shares | 1.0 |  |  | — |  |  | 0.1 |
Net Income per Share - Omnicom Group Inc.: |  |  |  |  |
Basic | $ | 4.68 |  |  | $ | 4.80 |  |  | $ | 4.43 |
Diluted | $ | 4.65 |  |  | $ | 4.78 |  |  | $ | 4.41 |

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- Definition Net Income per Share [Abstract] + References No definition available. + Details
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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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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