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Goodwill and Other Intangible Assets Changes in Carrying Value of Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill | The changes in the carrying value of goodwill for our segments, IAN, CMG and Corporate & other, for the years ended December 31, 2018 and 2017 are listed below.
|  | IAN |  | CMG |  | Corporate & other 1 |  | Total 2
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 |
Acquisitions |  | 1.2 |  |  | 20.0 |  |  | 1,110.8 |  |  | 1,132.0 |
Foreign currency and other |  | (63.3 | ) |  | (12.0 | ) |  | (1.2 | ) |  | (76.5 | )
Balance as of December 31, 2018 |  | $ | 3,099.7 |  |  | $ | 666.6 |  |  | $ | 1,109.6 |  |  | $ | 4,875.9 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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