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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, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill | The changes in the carrying value of goodwill for our reportable segments, IAN and DXTRA, for the years ended December 31, 2021 and 2020 are listed below.
|  | IAN |  | DXTRA |  |  |  | Total 1
Balance as of December 31, 2019 |  | $ | 4,218.1 |  |  | $ | 676.3 |  |  |  |  | $ | 4,894.4 |
Acquisitions |  | 23.5 |  |  | 0.5 |  |  |  |  | 24.0 |
Foreign currency and other |  | 22.9 |  |  | 4.2 |  |  |  |  | 27.1 |
Balance as of December 31, 2020 |  | $ | 4,264.5 |  |  | $ | 681.0 |  |  |  |  | $ | 4,945.5 |
Dispositions |  | (0.2) |  |  | — |  |  |  |  | (0.2) |
Foreign currency and other |  | (32.7) |  |  | (3.9) |  |  |  |  | (36.6) |
Balance as of December 31, 2021 |  | $ | 4,231.6 |  |  | $ | 677.1 |  |  |  |  | $ | 4,908.7 |

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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=121556970&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=121556970&loc=d3e13854-109267 + Details
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