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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Other Intangible Assets |
6. | Goodwill and Other Intangible Assets
Changes in the carrying amount of goodwill during the years ended December 31, 2017 and 2016 consisted of the following:
(dollars in millions) |  | North America |  |  | Rest of World |  |  | Total |
Balance at December 31, 2015 |  | $ | 361.0 |  |  | $ | 59.9 |  |  | $ | 420.9 |
Acquisitions |  |  | 70.0 |  |  |  | — |  |  |  | 70.0 |
Currency translation adjustment |  |  | 1.2 |  |  |  | (0.6 | ) |  |  | 0.6 |
Balance at December 31, 2016 |  |  | 432.2 |  |  |  | 59.3 |  |  |  | 491.5 |
Acquisitions |  |  | 22.2 |  |  |  | — |  |  |  | 22.2 |
Currency translation adjustment |  |  | 2.8 |  |  |  | 0.2 |  |  |  | 3.0 |
Balance at December 31, 2017 |  | $ | 457.2 |  |  | $ | 59.5 |  |  | $ | 516.7 |
The carrying amount of other intangible assets consisted of the following:
|  | 2017 |  |  | 2016 |
December 31 (dollars in millions) |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents |  | $ | 3.7 |  |  | $ | (2.7 | ) |  | $ | 1.0 |  |  | $ | 3.7 |  |  | $ | (2.2 | ) |  | $ | 1.5 |
Customer lists |  |  | 235.8 |  |  |  | (93.3 | ) |  |  | 142.5 |  |  |  | 224.0 |  |  |  | (80.3 | ) |  |  | 143.7 |
Total amortizable intangible assets |  |  | 239.5 |  |  |  | (96.0 | ) |  |  | 143.5 |  |  |  | 227.7 |  |  |  | (82.5 | ) |  |  | 145.2 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 165.2 |  |  |  | — |  |  |  | 165.2 |  |  |  | 163.1 |  |  |  | — |  |  |  | 163.1 |
Total intangible assets |  | $ | 404.7 |  |  | $ | (96.0 | ) |  | $ | 308.7 |  |  | $ | 390.8 |  |  | $ | (82.5 | ) |  | $ | 308.3 |
Amortization expenses of other intangible assets of $13.7 million, $13.4 million, and $14.2 million were recorded in 2017, 2016 and 2015, respectively. In the future, excluding the impact of any future acquisitions, the Company expects amortization expense of approximately $14.5 million annually and the intangible assets will be amortized over a weighted average period of 12 years. The Company concluded that no goodwill impairment existed at the time of the annual impairment tests which were performed in the fourth quarters of 2017, 2016 and 2015. No impairments of other intangible assets were recorded in 2017, 2016 and 2015.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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