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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, 2019
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, 2019 and 2018 are listed below.
|  | IAN 1 |  | CMG |  | Total 2
Balance as of December 31, 2017 |  | $ | 3,161.8 |  |  | $ | 658.6 |  |  | $ | 3,820.4 |
Acquisitions |  | 1,112.0 |  |  | 20.0 |  |  | 1,132.0 |
Foreign currency and other |  | (64.5 | ) |  | (12.0 | ) |  | (76.5 | )
Balance as of December 31, 2018 |  | $ | 4,209.3 |  |  | $ | 666.6 |  |  | $ | 4,875.9 |
Acquisitions |  | 2.1 |  |  | 0.7 |  |  | 2.8 |
Foreign currency and other |  | 14.4 |  |  | 1.3 |  |  | 15.7 |
Balance as of December 31, 2019 |  | $ | 4,225.8 |  |  | $ | 668.6 |  |  | $ | 4,894.4 |

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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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