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Goodwill and Purchased Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Gross Goodwill and Other Purchased Intangible Assets | Changes in the carrying amount of gross goodwill and other purchased intangibles for the years ended December 31, 2017 and 2016, by segment, are as follows
(In millions) |  | Composite Materials |  | Engineered Products |  | Total |
Balance as of December 31, 2015 |  | $ | 42.8 |  | $ | 16.1 |  | $ | 58.9 |
Amortization expense |  |  | (0.3 | ) |  | — |  |  | (0.3 | )
Additions |  |  | 18.1 |  |  | — |  |  | 18.1 |
Currency translation adjustments and other |  |  | (4.5 | ) |  | — |  |  | (4.5 | )
Balance as of December 31, 2016 |  | $ | 56.1 |  | $ | 16.1 |  | $ | 72.2 |
Amortization expense |  |  | (1.0 | ) |  | — |  |  | (1.0 | )
Additions |  |  | 41.2 |  |  | 28.9 |  |  | 70.1 |
Currency translation adjustments and other |  |  | 7.4 |  |  | — |  |  | 7.4 |
Balance as of December 31, 2017 |  | $ | 103.7 |  | $ | 45.0 |  | $ | 148.7 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance and exist in perpetuity, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b),(d) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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