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Impairment and restructuring charges - Narrative (Details) $ in Millions	1 Months Ended				3 Months Ended				9 Months Ended
	Aug. 31, 2024 employee	May 31, 2024 employee positions	Aug. 31, 2023 employee	Jan. 31, 2023 employee	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets					$ 0.0	$ 27.2	$ 0.0	$ 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					20.0				20.0
Number of currently vacant positions eliminated | positions		85
August 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | employee	70
Restructuring charges incurred since inception					$ 3.5				$ 3.5

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