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Intangible Assets Goodwill and Intangible Assets (Notes) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | 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 and CMG, for the years ended December 31, 2015 and 2014 are listed below.
|  | IAN |  | CMG |  | Total 1
Balance as of December 31, 2013 |  | $ | 3,097.0 |  |  | $ | 532.0 |  |  | $ | 3,629.0 |
Current-year acquisitions |  | 95.2 |  |  | 40.9 |  |  | 136.1 |
Foreign currency and other |  | (83.7 | ) |  | (12.2 | ) |  | (95.9 | )
Balance as of December 31, 2014 |  | $ | 3,108.5 |  |  | $ | 560.7 |  |  | $ | 3,669.2 |
Current-year acquisitions |  | 37.8 |  |  | 13.2 |  |  | 51.0 |
Foreign currency and other |  | (94.9 | ) |  | (16.8 | ) |  | (111.7 | )
Balance as of December 31, 2015 |  | $ | 3,051.4 |  |  | $ | 557.1 |  |  | $ | 3,608.5 |
1 | For all periods presented, we have not recorded a goodwill impairment charge.
See Note 1 for information regarding our annual impairment methodology. Other Intangible Assets Other intangible assets are comprised of both assets with indefinite lives not subject to amortization and assets with definite lives subject to amortization. Other intangible assets primarily consist of customer lists and trade names, which have definitive lives and are subject to amortization on a straight-line basis with estimated useful lives generally between 7 and 15 years. Amortization expense for other intangible assets for the years ended December 31, 2015, 2014 and 2013 was $26.1, $29.4 and $26.8, respectively. There were no material impairment charges on other intangibles for the years ended December 31, 2015, 2014 and 2013. During 2015 and 2014, we recorded approximately $9.6 and $48.6 of intangible assets related to our acquisitions in the respective year. The following table provides a summary of other intangible assets, which are included in other assets on our Consolidated Balance Sheets.
|  | December 31,
|  | 2015 |  | 2014
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Customer lists |  | $ | 249.0 |  |  | $ | (150.0 | ) |  | $ | 99.0 |  |  | $ | 255.8 |  |  | $ | (139.3 | ) |  | $ | 116.5 |
Trade names |  | 65.0 |  |  | (25.7 | ) |  | 39.3 |  |  | 71.0 |  |  | (22.8 | ) |  | 48.2 |
Other |  | 13.7 |  |  | (3.7 | ) |  | 10.0 |  |  | 14.1 |  |  | (3.8 | ) |  | 10.3 |
Total |  | $ | 327.7 |  |  | $ | (179.4 | ) |  | $ | 148.3 |  |  | $ | 340.9 |  |  | $ | (165.9 | ) |  | $ | 175.0 |
The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2015 is listed below.
|  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020
Estimated amortization expense |  | $ | 23.2 |  |  | $ | 21.7 |  |  | $ | 20.1 |  |  | $ | 17.1 |  |  | $ | 16.0 |

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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