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Discontinued Operations - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 27, 2021 USD ($) building	Mar. 28, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 27, 2021 USD ($) building	Jun. 28, 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	$ (0.4)		$ 0.0	$ 7.1	$ 0.0
Held-for-sale | Building | Elektron
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties to be disposed | building	1			1		1
Amount of property disposed	$ 3.7			$ 3.7		$ 3.7
Superform Aluminum Superplastic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration of disposal	20.6	$ 21.0		20.6
Superform Aluminum Superplastic | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of discontinued operations	7.1	7.5
Tax charge		$ 2.0
Working capital adjustment	0.4
Superform Aluminum Superplastic | Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of property disposed	$ 5.1			$ 5.1		$ 11.6

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