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Impairment and restructuring charges - Narrative (Details) $ in Millions	1 Months Ended				3 Months Ended		12 Months Ended
	Aug. 31, 2024 employee	May 31, 2024 employee positions	Aug. 31, 2023 employee	Jan. 31, 2023 employee	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets					$ 27.2	$ 306.7	$ 27.2	$ 306.7	$ 0.0
January 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated | employee				125
Restructuring charges incurred since inception							9.3
August 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated | employee			400
Restructuring charges incurred since inception							19.4
May 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated | employee		300
Restructuring charges incurred since inception							19.8
Number of currently vacant positions eliminated | positions		85
August 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated | employee	70
Restructuring charges incurred since inception							$ 3.3

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

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