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Impairment and restructuring charges - Narrative (Details) $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended
	May 31, 2024 positions employee	Aug. 31, 2023 employee	Jan. 31, 2023 employee	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets				$ 27.2	$ 306.7	$ 27.2	$ 306.7
January 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | employee			125
Restructuring charges incurred since inception				9.3		9.3
August 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | employee		400
Restructuring charges incurred since inception				19.4		19.4
May 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | employee	300
Restructuring charges incurred since inception				$ 17.2		$ 17.2
Number of currently vacant positions eliminated | positions	85

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Amount of costs incurred to date for the specified restructuring cost.

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