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Presentation of Financial Statements | 12 Months Ended
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Dec. 31, 2011
Presentation of Financial Statements [Abstract] |
Presentation of Financial Statements | Presentation of Financial Statements The terms “Omnicom,” “we,” “our” and “us” each refer to Omnicom Group Inc. and our subsidiaries, unless the context indicates otherwise. The accompanying consolidated financial statements were prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP” or “GAAP”). All intercompany balances and transactions have been eliminated. The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates and assumptions.

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