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Discontinued Operations - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 28, 2021 USD ($) building	Mar. 29, 2020 USD ($)	Dec. 31, 2020 USD ($) building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of discontinued operations, net of tax	$ 7.5	$ 0.0
Superform Aluminum Superplastic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of discontinued operations, net of tax	7.5
Tax expense	2.0
Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, plant and equipment	$ 5.1		$ 11.6
Held-for-sale | Building | Elektron segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties to be disposed | building	1		1
Property, plant and equipment	$ 3.7		$ 3.7

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