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Long-lived asset impairment and restructuring charges - Narrative (Details) $ in Millions	1 Months Ended		3 Months Ended				9 Months Ended
	Aug. 31, 2023 employee	Jan. 31, 2023 employee	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets			$ 0.0			$ 0.0	$ 306.7	$ 0.0
Restructuring costs			20.3				29.9
January 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | employee		125
Restructuring costs			(0.2)	$ (0.1)	$ 9.7		$ 9.4
August 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | employee	400
Restructuring costs			$ 20.5	$ 0.0	$ 0.0

X

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The number of positions eliminated during the period as a result of restructuring activities.

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