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Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2017
Noncontrolling Interests [Abstract] |
Changes in Ownership Interests in Less than 100% Owned Subsidiaries | Changes in the ownership interests in our less than 100% owned subsidiaries for the three years ended December 31, 2017 were (in millions):
| 2017 |  | 2016 |  | 2015
Net income attributed to Omnicom Group Inc. | $ | 1,088.4 |  |  | $ | 1,148.6 |  |  | $ | 1,093.9 |
Transfers (to) from noncontrolling interests: |  |  |  |  |
Increase in additional paid-in capital from sale of shares in noncontrolling interests | 1.8 |  |  | 2.0 |  |  | 1.7 |
Decrease in additional paid-in capital from purchase of shares in noncontrolling interests | (27.5 | ) |  | (89.7 | ) |  | (40.5 | )
Net transfers (to) from noncontrolling interests | (25.7 | ) |  | (87.7 | ) |  | (38.8 | )
Change from net income attributed to Omnicom Group Inc. and transfers (to) from noncontrolling interests | $ | 1,062.7 |  |  | $ | 1,060.9 |  |  | $ | 1,055.1 |

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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=84234705&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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