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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