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Discontinued Operations - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 26, 2021
USD ($)
building
$ / shares
Jun. 27, 2021
USD ($)
Mar. 28, 2021
USD ($)
Sep. 27, 2020
USD ($)
$ / shares
Sep. 26, 2021
USD ($)
building
$ / shares
Sep. 27, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Basic from discontinued operations (usd per share) | $ / shares [1],[2] $ (0.04)     $ 0.01 $ 0.14 $ (0.05)  
Gain / (loss) on disposition of discontinued operations, net of tax $ (0.5)     $ 0.0 $ 6.6 $ 0.0  
(Loss) / income from discontinued operations, net of tax $ (0.7)     0.2 $ (2.8) (1.3)  
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 | Discontinued Operations, Held-for-sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
(Loss) / income from discontinued operations, net of tax (0.7)     $ 0.2 (2.8) $ (1.3)  
Superform Aluminum Superplastic | Discontinued Operations, Held-for-sale | U.S.              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Consideration received   $ 21.0 $ 20.2        
Working capital adjustment   $ 0.8          
Gain / (loss) on disposition of discontinued operations, net of tax     6.7        
Tax charge     $ 2.0        
Superform Aluminum Superplastic | Discontinued Operations, Held-for-sale | United Kingdom              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Consideration received 4.1       4.1    
Cash consideration received 3.5       3.5    
Deferred consideration payable 0.6       0.6    
Gain / (loss) on disposition of discontinued operations, net of tax (0.1)            
Tax charge 0.0            
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 4.8       $ 4.8   $ 11.6
Graham | Discontinued Operations, Held-for-sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Working capital adjustment 0.4            
Gain / (loss) on disposition of discontinued operations, net of tax $ (0.5)            
[1] The loss per share for discontinued operations in the Third Quarter of 2021 and the year-to-date of 2020 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.
[2] The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total.