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Goodwill - Carrying Amount of Goodwill By Segment (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) reportable_unit | Dec. 31, 2016 USD ($)
Goodwill [Line Items] |  |
Number of reportable units with goodwill | reportable_unit | 2 |
Goodwill [Roll Forward] |  |
Goodwill beginning of period, net | $ 229,500,000 | $ 233,300,000
Goodwill acquired during the year | 106,200,000 |
Goodwill, Purchase Accounting Adjustments |  | (200,000)
Foreign currency translation adjustments | 5,600,000 | (3,600,000)
Goodwill end of period, net | 341,300,000 | 229,500,000
Engineered Papers [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment losses | 2,700,000 |
Goodwill [Roll Forward] |  |
Goodwill beginning of period, net | 4,700,000 | 4,800,000
Goodwill acquired during the year | 0 |
Goodwill, Purchase Accounting Adjustments |  | 0
Foreign currency translation adjustments | 500,000 | (100,000)
Goodwill end of period, net | 5,200,000 | 4,700,000
Advanced Materials & Structures [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment losses | 0 |
Goodwill [Roll Forward] |  |
Goodwill beginning of period, net | 224,800,000 | 228,500,000
Goodwill acquired during the year | 106,200,000 |
Goodwill, Purchase Accounting Adjustments |  | (200,000)
Foreign currency translation adjustments | 5,100,000 | (3,500,000)
Goodwill end of period, net | $ 336,100,000 | $ 224,800,000

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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