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Discontinued Operations - Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 27, 2021
Dec. 31, 2020
Held-for-sale assets    
Held-for-sale assets $ 20.1 $ 36.0
Held-for-sale liabilities    
Held-for-sale liabilities 6.5 11.4
Discontinued Operations | Superform Aluminum Superplastic    
Held-for-sale assets    
Property, plant and equipment 1.4 7.9
Right-of-use-assets from operating leases 2.6 3.1
Inventory 5.9 12.6
Accounts and other receivables 6.5 8.7
Held-for-sale assets 16.4 32.3
Held-for-sale liabilities    
Accounts payable 2.3 4.3
Accrued liabilities 1.0 1.5
Other current liabilities 3.2 5.6
Held-for-sale liabilities $ 6.5 $ 11.4