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Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2011
Noncontrolling Interests [Abstract] |
Changes in Ownership Interests in Less than 100% Owned Subsidiaries [Table Text Block] | Changes in our ownership interests in our less than 100% owned subsidiaries during the three years ended December 31, 2011, were (in millions):
| 2011 |  | 2010 |  | 2009
Net income attributed to Omnicom Group Inc. | $ | 952.6 |  |  | $ | 827.7 |  |  | $ | 793.0 |
Transfers (to) from noncontrolling interests: |  |  |  |  |
Increase in additional paid-in capital from sale |  |  |  |  |
of shares in noncontrolling interests | 4.8 |  |  | 2.2 |  |  | — |
Decrease in additional paid-in capital from purchase |  |  |  |  |
of shares in noncontrolling interests | (37.6 | ) |  | (26.0 | ) |  | (25.6 | )
Net transfers (to) from noncontrolling interests | (32.8 | ) |  | (23.8 | ) |  | (25.6 | )
Changes in net income attributed to Omnicom Group Inc. |  |  |  |  |
and transfers (to) from noncontrolling interests | $ | 919.8 |  |  | $ | 803.9 |  |  | $ | 767.4 |

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- Definition The tabular disclosure of the effects of any changes in a parent's ownership interest in a subsidiary on the equity attributable to the parent if the ownership interests in a subsidiary changes during the period. The changes represented by this element did not result in the deconsolidation of the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A + Details
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