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Intangible assets and goodwill - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill impairment		$ (218.2)	$ (6.7)	$ (41.7)
Goodwill		$ 0.0	$ 218.2	$ 224.9
MCM Products
Goodwill [Line Items]
Goodwill impairment	$ (218.2)

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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