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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by segment for the six months ended June 30, 2019 were as follows ($ in millions):
| Advanced Materials & Structures |  | Engineered Papers |  | Total
Goodwill as of December 31, 2018 | $ | 333.1 |  |  | $ | 5.0 |  |  | $ | 338.1 |
Foreign currency translation adjustments | (0.1 | ) |  | — |  |  | (0.1 | )
Goodwill as of June 30, 2019 | $ | 333.0 |  |  | $ | 5.0 |  |  | $ | 338.0 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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