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Impairment and restructuring charges - Narrative (Details) $ in Millions	1 Months Ended				3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2024 employee	May 31, 2024 employee positions	Aug. 31, 2023 employee	Jan. 31, 2023 employee	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets					$ 0.0	$ 27.2	$ 0.0	$ 27.2	$ 27.2
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					18.2		18.2
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					$ 2.5		$ 2.5

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