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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Unamortized Intangible Assets (Advanced Materials & Structures) |  |  |  |  |
Amortization expense of intangible assets | $ 5.1 | $ 5.2 | $ 15.3 | $ 15.6 |
Estimated average amortization, remainder of year | 19.7 |  | 19.7 |  |
Estimated average amortization, year two | 19.9 |  | 19.9 |  |
Estimated average amortization, year three | 19.9 |  | 19.9 |  |
Estimated average amortization, year four | 19.9 |  | 19.9 |  |
Estimated average amortization, year five | 19.9 |  | 19.9 |  |
Advanced Materials & Structures |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Gross Carrying Amount | 336.5 |  | 336.5 |  | $ 336.5
Accumulated Amortization | 77.1 |  | 77.1 |  | 61.8
Accumulated Impairments | 20.7 |  | 20.7 |  | 20.7
Accumulated Foreign Exchange | 4.0 |  | 4.0 |  | 1.2
Net Carrying Amount | 234.7 |  | 234.7 |  | 252.8
Advanced Materials & Structures | Trade names |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Accumulated Impairments | 0.1 |  | 0.1 |  | 0.1
Accumulated Foreign Exchange | 0.1 |  | 0.1 |  | (0.1)
Unamortized Intangible Assets (Advanced Materials & Structures) |  |  |  |  |
Gross Carrying Amount | 20.0 |  | 20.0 |  | 20.0
Net Carrying Amount | 19.8 |  | 19.8 |  | 20.0
Advanced Materials & Structures | Customer relationships |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Gross Carrying Amount | 276.3 |  | 276.3 |  | 276.3
Accumulated Amortization | 63.4 |  | 63.4 |  | 50.4
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 3.1 |  | 3.1 |  | 0.7
Net Carrying Amount | 209.8 |  | 209.8 |  | 225.2
Advanced Materials & Structures | Developed technology |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Gross Carrying Amount | 34.0 |  | 34.0 |  | 34.0
Accumulated Amortization | 10.3 |  | 10.3 |  | 8.5
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.6 |  | 0.6 |  | 0.2
Net Carrying Amount | 23.1 |  | 23.1 |  | 25.3
Advanced Materials & Structures | Trade names |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Gross Carrying Amount | 21.8 |  | 21.8 |  | 21.8
Accumulated Amortization | 0.8 |  | 0.8 |  | 0.8
Accumulated Impairments | 20.7 |  | 20.7 |  | 20.7
Accumulated Foreign Exchange | 0.3 |  | 0.3 |  | 0.3
Net Carrying Amount | 0.0 |  | 0.0 |  | 0.0
Advanced Materials & Structures | Non-compete agreements |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Gross Carrying Amount | 2.9 |  | 2.9 |  | 2.9
Accumulated Amortization | 2.2 |  | 2.2 |  | 1.7
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0 |  | 0.0
Net Carrying Amount | 0.7 |  | 0.7 |  | 1.2
Advanced Materials & Structures | Patents |  |  |  |  |
Amortized Intangible Assets |  |  |  |  |
Gross Carrying Amount | 1.5 |  | 1.5 |  | 1.5
Accumulated Amortization | 0.4 |  | 0.4 |  | 0.4
Accumulated Impairments | 0.0 |  | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0 |  | 0.0
Net Carrying Amount | $ 1.1 |  | $ 1.1 |  | $ 1.1

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