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Discontinued Operations - Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Held-for-sale assets    
Current assets $ 23.4 $ 8.9
Held-for-sale liabilities    
Held-for-sale liabilities 9.4 3.9
Discontinued operations | Superform Aluminum Superplastic    
Held-for-sale assets    
Inventory 3.7 3.3
Accounts and other receivables 2.1 2.3
Current assets 5.8 5.6
Right-of-use-assets 1.7 2.1
Held-for-sale assets 7.5 7.7
Held-for-sale liabilities    
Accounts payable 0.7 0.9
Accrued liabilities 0.3 0.4
Other liabilities 2.4 2.6
Held-for-sale liabilities $ 3.4 $ 3.9