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Intangible Assets Changes in Carrying Value of Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill | The changes in the carrying value of goodwill for our segments, IAN and CMG, for the years ended December 31, 2017 and 2016 are listed below.
|  | IAN |  | CMG |  | Total 1
Balance as of December 31, 2015 |  | $ | 3,051.4 |  |  | $ | 557.1 |  |  | $ | 3,608.5 |
Acquisitions |  | 32.7 |  |  | 89.3 |  |  | 122.0 |
Foreign currency and other |  | (40.3 | ) |  | (15.8 | ) |  | (56.1 | )
Balance as of December 31, 2016 |  | $ | 3,043.8 |  |  | $ | 630.6 |  |  | $ | 3,674.4 |
Acquisitions |  | 39.6 |  |  | 15.5 |  |  | 55.1 |
Foreign currency and other |  | 78.4 |  |  | 12.5 |  |  | 90.9 |
Balance as of December 31, 2017 |  | $ | 3,161.8 |  |  | $ | 658.6 |  |  | $ | 3,820.4 |
1 | For all periods presented, no goodwill impairment charge has been recorded.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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