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Goodwill and Purchased Intangible Assets - Schedule of Gross Goodwill and Other Purchased Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Changes in the carrying amount of gross goodwill and other purchased intangibles |  |
Balance at the beginning of the period | $ 72.2 | $ 58.9
Amortization expense | (1.0) | (0.3)
Additions | 70.1 | 18.1
Currency translation adjustments and other | 7.4 | (4.5)
Balance at the end of the period | 148.7 | 72.2
Composite Materials |  |
Changes in the carrying amount of gross goodwill and other purchased intangibles |  |
Balance at the beginning of the period | 56.1 | 42.8
Amortization expense | (1.0) | (0.3)
Additions | 41.2 | 18.1
Currency translation adjustments and other | 7.4 | (4.5)
Balance at the end of the period | 103.7 | 56.1
Engineered Products |  |
Changes in the carrying amount of gross goodwill and other purchased intangibles |  |
Balance at the beginning of the period | 16.1 | 16.1
Additions | 28.9 |
Balance at the end of the period | $ 45.0 | $ 16.1

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- Definition Goodwill and intangible assets acquired. + References No definition available. + Details
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- Definition Reflects increase (decrease) to the recorded value goodwill and indefinite-lived intangible assets for foreign currency translation adjustments. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Sum of the carrying amounts of all intangible assets, as of the balance sheet date, net of accumulated amortization and impairment charges. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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