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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2019 | $ | 332.5 |  |  | $ | 4.9 |  |  | $ | 337.4 |
Goodwill acquired during the year | 61.2 |  |  | — |  |  | 61.2 |
Foreign currency translation adjustments | 4.7 |  |  | 0.4 |  |  | 5.1 |
Goodwill as of December 31, 2020 | $ | 398.4 |  |  | $ | 5.3 |  |  | $ | 403.7 |
Goodwill acquired during the year | 250.4 |  |  | — |  |  | 250.4 |
Foreign currency translation adjustments | (5.4) |  |  | (0.4) |  |  | (5.8) |
Goodwill as of December 31, 2021 | $ | 643.4 |  |  | $ | 4.9 |  |  | $ | 648.3 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://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=121556970&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=121556970&loc=d3e13854-109267 + Details
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