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Goodwill | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill The changes in the carrying amount of goodwill by segment for the six months ended June 30, 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 | (1.3 | ) |  | (0.1 | ) |  | (1.4 | )
Goodwill as of June 30, 2018 | $ | 334.8 |  |  | $ | 5.1 |  |  | $ | 339.9 |

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