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Intangible assets - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted average amortization period	11 years 4 months 24 days
Goodwill, impaired, accumulated impairment loss	$ 41.7	$ 41.7
Goodwill	$ 224.9	$ 224.9

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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