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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | $ 5.2 | $ 5.5 |
Estimated Amortization Expense |  |  |
Estimated average amortization expense in each of next five years | 20.3 |  |
Advanced Materials & Structures Segment [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 336.5 |  | $ 337.4
Accumulated Amortization | 51.5 |  | 42.0
Accumulated Impairments | 20.7 |  | 20.7
Accumulated Foreign Exchange | (0.2) |  | (2.1)
Net Carrying Amount | 264.5 |  | 276.8
Advanced Materials & Structures Segment [Member] | Trade names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | (0.2) |  | (0.4)
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 20.0 |  | 20.0
Indefinite-lived Intangible Assets (Excluding Goodwill) | 20.2 |  | 20.4
Advanced Materials & Structures Segment [Member] | Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 276.3 |  | 276.3
Accumulated Amortization | 41.7 |  | 32.9
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | (0.5) |  | (2.3)
Net Carrying Amount | 235.1 |  | 245.7
Advanced Materials & Structures Segment [Member] | Developed technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 34.0 |  | 34.0
Accumulated Amortization | 7.3 |  | 6.0
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | (0.1)
Net Carrying Amount | 26.7 |  | 28.1
Advanced Materials & Structures Segment [Member] | Customer contracts [Member] |  |  |
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
Advanced Materials & Structures Segment [Member] | Trade names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 21.8 |  | 21.8
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
Advanced Materials & Structures Segment [Member] | Non-compete agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2.9 |  | 2.9
Accumulated Amortization | 1.4 |  | 1.1
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0
Net Carrying Amount | 1.5 |  | 1.8
Advanced Materials & Structures Segment [Member] | Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1.5 |  | 1.5
Accumulated Amortization | 0.3 |  | 0.3
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0
Net Carrying Amount | $ 1.2 |  | $ 1.2

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