Intangible assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted average amortization period	11 years 8 months 12 days
Goodwill, impaired, accumulated impairment loss	$ 41.7	$ 41.7