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Goodwill and Other Intangible Assets (Notes) | 12 Months Ended
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Dec. 31, 2020
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 reportable segments, IAN and DXTRA, for the years ended December 31, 2020 and 2019 are listed below.
|  | IAN |  | DXTRA |  |  |  | Total 1
Balance as of December 31, 2018 |  | $ | 4,201.5 |  |  | $ | 674.4 |  |  |  |  | $ | 4,875.9 |
Acquisitions |  | 2.1 |  |  | 0.7 |  |  |  |  | 2.8 |
Foreign currency and other |  | 14.5 |  |  | 1.2 |  |  |  |  | 15.7 |
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 |
1 For all periods presented, no goodwill impairment charge has been recorded. See Note 1 for information regarding our annual impairment testing 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, 2020, 2019 and 2018 was $85.9, $86.0 and $37.6, respectively. There were no material impairment charges on other intangibles for the years ended December 31, 2020, 2019 and 2018. During 2020 and 2019, we recorded approximately $4.0 and $5.0 of other intangible assets related to our acquisitions in the respective year. The following table provides a summary of other intangible assets, which are included in our Consolidated Balance Sheets.
|  | December 31,
|  | 2020 |  | 2019
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Customer lists |  | $ | 859.5 |  |  | $ | (293.3) |  |  | $ | 566.2 |  |  | $ | 861.4 |  |  | $ | (244.6) |  |  | $ | 616.8 |
Know-how and technology |  | 235.4 |  |  | (58.9) |  |  | 176.5 |  |  | 235.0 |  |  | (32.9) |  |  | 202.1 |
Trade names |  | 224.4 |  |  | (44.1) |  |  | 180.3 |  |  | 226.2 |  |  | (41.3) |  |  | 184.9 |
Other |  | 14.6 |  |  | (4.0) |  |  | 10.6 |  |  | 14.3 |  |  | (3.8) |  |  | 10.5 |
Total |  | $ | 1,333.9 |  |  | $ | (400.3) |  |  | $ | 933.6 |  |  | $ | 1,336.9 |  |  | $ | (322.6) |  |  | $ | 1,014.3 |
The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2020 is listed below.
|  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025
Estimated amortization expense |  | $ | 88.3 |  |  | $ | 83.8 |  |  | $ | 79.0 |  |  | $ | 77.3 |  |  | $ | 74.5 |

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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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