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Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Oct. 01, 2023	Dec. 31, 2022
Held-for-sale assets
Current assets	$ 9.1	$ 9.3
Held-for-sale liabilities
Held-for-sale liabilities	4.2	5.0
Discontinued operations | Superform Aluminum Superplastic
Held-for-sale assets
Inventory	3.3	2.7
Accounts and other receivables	2.3	2.7
Current assets	5.6	5.4
Right-of-use-assets	2.3	2.7
Held-for-sale assets	7.9	8.1
Held-for-sale liabilities
Accounts payable	1.0	0.8
Accrued liabilities	0.4	0.2
Other liabilities	0.2	1.0
Operating lease liability	2.6	3.0
Held-for-sale liabilities	$ 4.2	$ 5.0

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