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Goodwill | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill The changes in the carrying amount of goodwill by segment for the three months ended March 31, 2018 were as follows ($ in millions):
| Advanced Materials & Structures |  | Engineered Papers |  | Total
Goodwill as of December 31, 2017 | $ | 336.1 |  |  | $ | 5.2 |  |  | $ | 341.3 |
Foreign currency translation adjustments | 1.8 |  |  | 0.1 |  |  | 1.9 |
Goodwill as of March 31, 2018 | $ | 337.9 |  |  | $ | 5.3 |  |  | $ | 343.2 |

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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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