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Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Provision for income taxes $ 0.0 $ 0.9 $ 1.0
Net loss (0.8) (5.6) (2.7)
Superform Aluminum Superplastic | Discontinued operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net sales 53.2 70.1 86.0
Cost of goods sold (51.5) (65.8) (81.8)
Gross profit 1.7 4.3 4.2
Selling, general and administrative expenses (5.8) (5.3) (6.3)
Restructuring charges (0.1) (0.1) (0.2)
Impairment charges 0.0 (5.2) (1.3)
Other income 3.4 0.0 0.0
Operating loss (0.8) (6.3) (3.6)
Net interest expense 0.0 (0.2) (0.1)
Net loss before income taxes $ (0.8) $ (6.5) $ (3.7)