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Goodwill and Other Intangible Assets (Notes) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | Goodwill and Other Intangible Assets Goodwill Goodwill is the excess purchase price remaining from an acquisition after an allocation of purchase price has been made to identifiable assets acquired and liabilities assumed based on estimated fair values. 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 |
1 | During 2018, the increase in goodwill is primarily due to the acquisition of Acxiom. See Note 6 for further information on the Acxiom Acquisition.
2 | For all periods presented, no goodwill impairment charge has been recorded.
See Note 1 for information regarding our annual impairment methodology. Other Intangible Assets Other intangible assets primarily consist of customer lists and know-how and technology, which have definite lives and are subject to amortization on a straight-line basis with estimated useful lives generally between 7 and 15 years, as well as trade names which have both indefinite and definite lives which are subject to amortization on a straight-line basis with estimated useful lives of 15 years. Amortization expense for other intangible assets for the years ended December 31, 2018, 2017 and 2016 was $37.6, $21.1 and $21.9, respectively. There were no material impairment charges on other intangibles for the years ended December 31, 2018, 2017 and 2016. During 2018 and 2017, we recorded approximately $999.0 and $7.0 of other intangible assets related to our acquisitions in the respective year. The increase in 2018 is primarily due to the acquisition of Acxiom. The following table provides a summary of other intangible assets, which are included in our Consolidated Balance Sheets.
|  | December 31,
|  | 2018 |  | 2017
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Customer lists |  | $ | 857.2 |  |  | $ | (190.9 | ) |  | $ | 666.3 |  |  | $ | 267.3 |  |  | $ | (172.2 | ) |  | $ | 95.1 |
Know-how and technology |  | 235.0 |  |  | (6.5 | ) |  | 228.5 |  |  | — |  |  | — |  |  | — |
Trade names |  | 226.2 |  |  | (36.8 | ) |  | 189.4 |  |  | 68.8 |  |  | (33.8 | ) |  | 35.0 |
Other |  | 14.4 |  |  | (3.8 | ) |  | 10.6 |  |  | 14.4 |  |  | (3.8 | ) |  | 10.6 |
Total |  | $ | 1,332.8 |  |  | $ | (238.0 | ) |  | $ | 1,094.8 |  |  | $ | 350.5 |  |  | $ | (209.8 | ) |  | $ | 140.7 |
The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2018 is listed below.
|  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Estimated amortization expense |  | $ | 87.8 |  |  | $ | 87.3 |  |  | $ | 85.6 |  |  | $ | 82.3 |  |  | $ | 78.2 |

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- Definition Goodwill and Intangible Assets [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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