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Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 336.5 | $ 337.4 |
Accumulated Amortization | 61.8 | 42.0 |
Accumulated Impairments | 20.7 | 20.7 |
Accumulated Foreign Exchange | 1.2 | (2.1) |
Net Carrying Amount | 252.8 | 276.8 |
Amortization expense of intangible assets | 20.7 | 20.9 | $ 12.3
Estimated Amortization Expense |  |  |
2019 | 20.4 |  |
2020 | 20.0 |  |
2021 | 20.0 |  |
2022 | 20.0 |  |
2023 | 19.7 |  |
Trade names | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Impairments | 0.1 | 0.0 |
Accumulated Foreign Exchange | (0.1) | (0.4) |
Unamortized Intangible Assets (Advanced Materials & Structures), Gross Carrying Amount | 20.0 | 20.0 |
Unamortized Intangible Assets (Advanced Materials & Structures), Net Carrying Amount | 20.0 | 20.4 |
Customer relationships | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 276.3 | 276.3 |
Accumulated Amortization | 50.4 | 32.9 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.7 | (2.3) |
Net Carrying Amount | 225.2 | 245.7 |
Developed technology | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 34.0 | 34.0 |
Accumulated Amortization | 8.5 | 6.0 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.2 | (0.1) |
Net Carrying Amount | 25.3 | 28.1 |
Customer contracts | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 0.9 |
Accumulated Amortization |  | 0.9 |
Accumulated Impairments |  | 0.0 |
Accumulated Foreign Exchange |  | 0.0 |
Net Carrying Amount |  | 0.0 |
Trade names | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 21.8 | 21.8 | 0.8
Accumulated Amortization | 0.8 | 0.8 |
Accumulated Impairments | 20.7 | 20.7 |
Accumulated Foreign Exchange | 0.3 | 0.3 |
Net Carrying Amount | 0.0 | 0.0 |
Impairment expenses |  |  | $ 20.7
Non-compete agreements | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2.9 | 2.9 |
Accumulated Amortization | 1.7 | 1.1 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.0 | 0.0 |
Net Carrying Amount | 1.2 | 1.8 |
Patents | Advanced Materials & Structures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1.5 | 1.5 |
Accumulated Amortization | 0.4 | 0.3 |
Accumulated Impairments | 0.0 | 0.0 |
Accumulated Foreign Exchange | 0.0 | 0.0 |
Net Carrying Amount | $ 1.1 | $ 1.2 |

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