Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 336.5	$ 336.5
Accumulated Amortization	82.0	61.8
Accumulated Impairments	20.7	20.7
Accumulated Foreign Exchange	2.5	1.2
Net Carrying Amount	231.3	252.8
Amortization expense of intangible assets	20.3	20.7	$ 20.9
Estimated Amortization Expense
2020	19.9
2021	19.9
2022	19.9
2023	19.6
2024	19.2
Trade names | Advanced Materials & Structures
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization		0.0
Accumulated Impairments	0.1	0.1
Accumulated Foreign Exchange	0.0	(0.1)
Unamortized Intangible Assets (Advanced Materials & Structures), Gross Carrying Amount	20.0	20.0
Unamortized Intangible Assets (Advanced Materials & Structures), Net Carrying Amount	19.9	20.0
Customer relationships | Advanced Materials & Structures
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	276.3	276.3
Accumulated Amortization	67.7	50.4
Accumulated Impairments	0.0	0.0
Accumulated Foreign Exchange	1.8	0.7
Net Carrying Amount	206.8	225.2
Developed technology | Advanced Materials & Structures
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	34.0	34.0
Accumulated Amortization	10.9	8.5
Accumulated Impairments	0.0	0.0
Accumulated Foreign Exchange	0.4	0.2
Net Carrying Amount	22.7	25.3
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	2.2	1.7
Accumulated Impairments	0.0	0.0
Accumulated Foreign Exchange	0.0	0.0
Net Carrying Amount	0.7	1.2
Patents | Advanced Materials & Structures
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.5	1.5
Accumulated Amortization	0.4	0.4
Accumulated Impairments	0.0	0.0
Accumulated Foreign Exchange	0.0	0.0
Net Carrying Amount	$ 1.1	$ 1.1