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Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 28, 2021	Dec. 31, 2020
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Right-of-use-assets from operating leases	$ 2.9	$ 3.1
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Accrued liabilities	1.1	1.5
Other current liabilities	3.3	5.6
Current liabilities held-for-sale	7.3	11.4
Discontinued Operations | Superform Aluminum Superplastic
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Property, plant and equipment	1.4	7.9
Right-of-use-assets from operating leases	2.9	3.1
Inventory	6.3	12.6
Accounts and other receivables	6.4	8.7
Held-for-sale assets	17.0	32.3
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Accounts payable	2.9	4.3
Accrued liabilities	1.1	1.5
Other current liabilities	3.3	5.6
Current liabilities held-for-sale	$ 7.3	$ 11.4

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