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Net Income per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Net Income per Share [Abstract] |
Basic and Diluted Net Income per Share | Basic and diluted net income per share:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Net Income - Omnicom Group Inc. | $ | 341.3 |  |  | $ | 385.9 |  |  | $ | 886.6 |  |  | $ | 1,032.6 |
Weighted Average Shares (millions): |  |  |  |  |  |  |
Basic | 193.8 |  |  | 195.6 |  |  | 195.2 |  |  | 196.5 |
Dilutive stock options and restricted shares | 1.1 |  |  | 2.6 |  |  | 1.2 |  |  | 2.4 |
Diluted | 194.9 |  |  | 198.2 |  |  | 196.4 |  |  | 198.9 |
Anti-dilutive stock options and restricted shares (millions) | 5.8 |  |  | — |  |  | 5.8 |  |  | — |
Net Income per Share - Omnicom Group Inc.: |  |  |  |  |  |  |
Basic | $1.76 |  | $1.97 |  | $4.54 |  | $5.25
Diluted | $1.75 |  | $1.95 |  | $4.51 |  | $5.19

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- Definition Net Income per Share [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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