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Supplementary balance sheet information - Schedule of Current Held-for-Sale Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Held-for-sale assets
Held-for-sale assets	$ 10.5	$ 36.0
Held-for-sale liabilities
Held-for-sale liabilities	1.7	11.4
Held-for-sale | Superform Aluminum Superplastic
Held-for-sale assets
Property, plant and equipment	4.8	11.6
Right-of-use-assets from operating leases	0.4	3.1
Inventory	2.7	12.6
Accounts and other receivables	2.6	8.7
Held-for-sale assets	10.5	36.0
Held-for-sale liabilities
Accounts payable	0.6	4.3
Accrued liabilities	0.1	1.5
Other current liabilities	1.0	5.6
Held-for-sale liabilities	$ 1.7	$ 11.4

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