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Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 337.4 | $ 220.1 |
Accumulated Amortization | 42.0 | 31.1 |
Accumulated Impairments | 20.7 | 20.7 |
Accumulated Foreign Exchange | (2.1) | 3.8 |
Net Carrying Amount | 276.8 | 164.5 |
Amortization expense of intangible assets | 20.9 | 12.3 | $ 5.6
Estimated Amortization Expense |  |  |
2018 | 20.7 |  |
2019 | 20.6 |  |
2020 | 20.3 |  |
2021 | 20.3 |  |
2022 | 20.2 |  |
Trade names [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | (0.4) | (0.1) |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 20.0 | 12.9 |
Estimated Amortization Expense |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 20.4 | 13.0 |
Customer-related intangibles [Member] | Engineered Papers [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net Carrying Amount |  | 0.0 |
Customer Relationships [Member] | Engineered Papers [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 10.0 |
Accumulated Amortization |  | 10.0 |
Accumulated Impairments |  | 0.0 |
Accumulated Foreign Exchange |  | 0.0 |
Customer Relationships [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 276.3 | 168.3 |
Accumulated Amortization | 32.9 | 15.9 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | (2.3) | 3.1 |
Net Carrying Amount | 245.7 | 149.3 |
Developed Technology [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 34.0 | 15.9 |
Accumulated Amortization | 6.0 | 3.6 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | (0.1) | 0.4 |
Net Carrying Amount | 28.1 | 11.9 |
Customer Contracts [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 0.9 | 0.9 |
Accumulated Amortization | 0.9 | 0.9 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.0 | 0.0 |
Net Carrying Amount | 0.0 | 0.0 |
Trade names [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 21.8 | 21.8 |
Accumulated Amortization | 0.8 | 0.0 |
Accumulated Impairments | 20.7 | 20.7 |
Accumulated Foreign Exchange | 0.3 | 0.3 |
Net Carrying Amount | 0.0 | 0.8 |
Amortized Intangible Assets, Impairments |  | 20.7 |
Non-competition agreements [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2.9 | 1.7 |
Accumulated Amortization | 1.1 | 0.5 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.0 | 0.0 |
Net Carrying Amount | 1.8 | 1.2 |
Patents [Member] | Advanced Materials & Structures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1.5 | 1.5 |
Accumulated Amortization | 0.3 | 0.2 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.0 | 0.0 |
Net Carrying Amount | 1.2 | $ 1.3 |
Conwed Plastics LLC [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | $ 8.2 |  |

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