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Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net loss $ (1.6) $ (1.0)
Net gain on disposition 7.5 0.0
Superform Aluminum Superplastic    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash consideration received 21.0  
Net assets sold (11.5)  
Gross gain on disposition 9.5  
Tax expense (2.0)  
Net gain on disposition 7.5  
Discontinued Operations | Superform Aluminum Superplastic    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net sales 9.7 15.4
Cost of goods sold (10.1) (15.0)
Gross profit (0.4) 0.4
Selling, general and administrative expenses (1.4) (1.4)
Operating loss (1.8) (1.0)
Tax credit (0.2) 0.0
Net loss $ (1.6) $ (1.0)