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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Data (Unaudited) [Abstract] |
Selected Quarterly Financial Data (Unaudited) | Selected Quarterly Financial Data (Unaudited) (In millions, except per share amounts) The unaudited selected quarterly financial data for the years ended December 31, 2017 and 2016 were:
| Quarter
| First |  | Second |  | Third |  | Fourth
Revenue |  |  |  |  |  |  |
2017 | $ | 3,587.4 |  |  | $ | 3,790.1 |  |  | $ | 3,719.5 |  |  | $ | 4,176.6 |
2016 | 3,499.1 |  |  | 3,884.9 |  |  | 3,791.1 |  |  | 4,241.8 |
Operating Expenses |  |  |  |  |  |  |
2017 | 3,177.5 |  |  | 3,224.6 |  |  | 3,255.3 |  |  | 3,556.5 |
2016 | 3,107.0 |  |  | 3,323.1 |  |  | 3,338.0 |  |  | 3,639.9 |
Operating Profit |  |  |  |  |  |  |
2017 | 409.9 |  |  | 565.5 |  |  | 464.2 |  |  | 620.1 |
2016 | 392.1 |  |  | 561.8 |  |  | 453.1 |  |  | 601.9 |
Net Income - Omnicom Group Inc. |  |  |  |  |  |  |
2017 | 241.8 |  |  | 328.6 |  |  | 263.6 |  |  | 254.4 |
2016 | 218.4 |  |  | 326.1 |  |  | 253.8 |  |  | 350.3 |
Net Income Per Share Omnicom Group Inc. - Basic |  |  |  |  |  |  |
2017 | 1.03 |  |  | 1.41 |  |  | 1.14 |  |  | 1.10 |
2016 | 0.90 |  |  | 1.36 |  |  | 1.06 |  |  | 1.47 |
Net Income Per Share Omnicom Group Inc. - Diluted |  |  |  |  |  |  |
2017 | 1.02 |  |  | 1.40 |  |  | 1.13 |  |  | 1.09 |
2016 | 0.90 |  |  | 1.36 |  |  | 1.06 |  |  | 1.47 |

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- Definition Selected Quarterly Financial Data (Unaudited) [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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