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Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Unamortized Intangible Assets (Advanced Materials & Structures)
Amortization expense of intangible assets	$ 5.2	$ 5.2	$ 15.6	$ 15.7
Estimated average amortization expense in each of next five years	20.3		20.3
Advanced Materials & Structures Segment [Member]
Amortized Intangible Assets
Gross Carrying Amount	336.5		336.5		$ 337.4
Accumulated Amortization	56.7		56.7		42.0
Accumulated Impairments	20.7		20.7		20.7
Accumulated Foreign Exchange	0.2		0.2		(2.1)
Net Carrying Amount	258.9		258.9		276.8
Advanced Materials & Structures Segment [Member] | Trade names [Member]
Amortized Intangible Assets
Accumulated Impairments	0.1		0.1		0.0
Accumulated Foreign Exchange	(0.2)		(0.2)		(0.4)
Unamortized Intangible Assets (Advanced Materials & Structures)
Gross Carrying Amount	20.0		20.0		20.0
Net Carrying Amount	20.1		20.1		20.4
Advanced Materials & Structures Segment [Member] | Customer relationships [Member]
Amortized Intangible Assets
Gross Carrying Amount	276.3		276.3		276.3
Accumulated Amortization	46.0		46.0		32.9
Accumulated Impairments	0.0		0.0		0.0
Accumulated Foreign Exchange	(0.2)		(0.2)		(2.3)
Net Carrying Amount	230.5		230.5		245.7
Advanced Materials & Structures Segment [Member] | Developed technology [Member]
Amortized Intangible Assets
Gross Carrying Amount	34.0		34.0		34.0
Accumulated Amortization	8.0		8.0		6.0
Accumulated Impairments	0.0		0.0		0.0
Accumulated Foreign Exchange	0.1		0.1		(0.1)
Net Carrying Amount	25.9		25.9		28.1
Advanced Materials & Structures Segment [Member] | Customer contracts [Member]
Amortized Intangible Assets
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]
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 Segment [Member] | Non-compete agreements [Member]
Amortized Intangible Assets
Gross Carrying Amount	2.9		2.9		2.9
Accumulated Amortization	1.6		1.6		1.1
Accumulated Impairments	0.0		0.0		0.0
Accumulated Foreign Exchange	0.0		0.0		0.0
Net Carrying Amount	1.3		1.3		1.8
Advanced Materials & Structures Segment [Member] | Patents [Member]
Amortized Intangible Assets
Gross Carrying Amount	1.5		1.5		1.5
Accumulated Amortization	0.3		0.3		0.3
Accumulated Impairments	0.0		0.0		0.0
Accumulated Foreign Exchange	0.0		0.0		0.0
Net Carrying Amount	$ 1.2		$ 1.2		$ 1.2

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