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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for each reportable segment were as follows ($ in millions):
| Advanced Materials & Structures |  | Engineered Papers |  | Total
Goodwill as of December 31, 2015 | $ | 228.5 |  |  | $ | 4.8 |  |  | $ | 233.3 |
Goodwill adjusted during the year | (0.2 | ) |  | — |  |  | (0.2 | )
Foreign currency translation adjustments | (3.5 | ) |  | (0.1 | ) |  | (3.6 | )
Goodwill as of December 31, 2016 | $ | 224.8 |  |  | $ | 4.7 |  |  | $ | 229.5 |
Goodwill acquired during the year | 106.2 |  |  | — |  |  | 106.2 |
Foreign currency translation adjustments | 5.1 |  |  | 0.5 |  |  | 5.6 |
Goodwill as of December 31, 2017 | $ | 336.1 |  |  | $ | 5.2 |  |  | $ | 341.3 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: 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 2: 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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