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Acquisitions and disposals - Results of Discontinued Operations (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 28, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposition			$ 6.6	$ 0.0	$ 0.0
Discontinued Operations, Disposed of by Sale | Superform U.K. Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds	$ 3.0
Net proceeds	4.0
Deferred consideration payable	1.0
Net assets sold	(4.5)
Loss on disposition	$ (0.5)
Discontinued Operations, Disposed of by Sale | U.S Aluminum Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds		$ 20.2				$ 20.2
Net assets sold						$ (11.5)
Gross gain on disposition			8.7
Tax expense			(1.6)
Loss on disposition		$ 7.1	$ 7.1

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