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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization expense of intangible assets | $ 5.2 | $ 3.0 | $ 15.7 | $ 9.2 |
Estimated Amortization Expense |  |  |  |  |
Estimated average amortization expense in each of next five years | 20.4 |  | 20.4 |  |
Advanced Materials & Structures [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 337.4 |  | 337.4 |  | $ 220.1
Accumulated Amortization | 36.8 |  | 36.8 |  | 31.1
Accumulated Impairments | 20.7 |  | 20.7 |  | 20.7
Accumulated Foreign Exchange | (0.9) |  | (0.9) |  | 3.8
Net Carrying Amount | 280.8 |  | 280.8 |  | 164.5
Advanced Materials & Structures [Member] | Trade names [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | (0.3) |  | (0.3) |  | (0.1)
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 20.0 |  | 20.0 |  | 12.9
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 20.3 |  | 20.3 |  | 13.0
Advanced Materials & Structures [Member] | Customer relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 276.3 |  | 276.3 |  | 168.3
Accumulated Amortization | 28.5 |  | 28.5 |  | 15.9
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | (1.2) |  | (1.2) |  | 3.1
Net Carrying Amount | 249.0 |  | 249.0 |  | 149.3
Advanced Materials & Structures [Member] | Developed technology [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 34.0 |  | 34.0 |  | 15.9
Accumulated Amortization | 5.4 |  | 5.4 |  | 3.6
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0 |  | 0.4
Net Carrying Amount | 28.6 |  | 28.6 |  | 11.9
Advanced Materials & Structures [Member] | Customer contracts [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 0.9 |  | 0.9 |  | 0.9
Accumulated Amortization | 0.9 |  | 0.9 |  | 0.9
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0 |  | 0.0
Net Carrying Amount | 0.0 |  | 0.0 |  | 0.0
Advanced Materials & Structures [Member] | Trade names [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 21.8 |  | 21.8 |  | 21.8
Accumulated Amortization | 0.8 |  | 0.8 |  | 0.0
Accumulated Impairments | 20.7 |  | 20.7 |  | 20.7
Accumulated Foreign Exchange | 0.3 |  | 0.3 |  | 0.3
Net Carrying Amount | 0.0 |  | 0.0 |  | 0.8
Advanced Materials & Structures [Member] | Non-compete agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 2.9 |  | 2.9 |  | 1.7
Accumulated Amortization | 1.0 |  | 1.0 |  | 0.5
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0 |  | 0.0
Net Carrying Amount | 1.9 |  | 1.9 |  | 1.2
Advanced Materials & Structures [Member] | Patents [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 1.5 |  | 1.5 |  | 1.5
Accumulated Amortization | 0.2 |  | 0.2 |  | 0.2
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0 |  | 0.0
Net Carrying Amount | 1.3 |  | 1.3 |  | 1.3
Engineered Papers [Member] | Customer relationships [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
Net Carrying Amount |  |  |  |  | $ 0.0
Conwed Plastics LLC [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization expense of intangible assets | $ 2.2 |  | $ 6.0 |  |

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