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Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss	$ (0.5)	$ (0.5)	$ (2.1)	$ (1.5)
Discontinued Operations, Held-for-sale | Superform Aluminum Superplastic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	4.9	12.9	14.6	28.3
Cost of goods sold	(5.6)	(12.1)	(15.7)	(27.1)
Gross (loss) / profit	(0.7)	0.8	(1.1)	1.2
Selling, general and administrative expenses	(0.3)	(1.3)	(1.7)	(2.7)
Operating loss	(1.0)	(0.5)	(2.8)	(1.5)
Tax credit	0.5	0.0	0.7	0.0
Net loss	$ (0.5)	$ (0.5)	$ (2.1)	$ (1.5)

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