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Impairment and restructuring charges - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring Reserve [Roll Forward]
Accruals	$ (1.1)		$ 17.1		$ (2.4)	$ 16.6
January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			0.1	$ 1.4		1.4
Cash payments			(0.1)	(1.3)
Ending balance			0.0	0.1		0.0
August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			1.3	5.4		5.4
Accruals			(0.1)	(0.5)
Cash payments			(0.6)	(3.6)
Ending balance			0.6	1.3		0.6
May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	1.8	$ 5.3	0.0		5.3
Accruals	(0.9)	(0.7)	17.2
Cash payments	(0.8)	(2.8)	(0.2)
Ending balance	0.1	1.8	17.0	0.0	0.1	17.0
August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.6	2.4			2.4
Accruals	(0.2)	(0.6)
Cash payments	(0.4)	(1.2)
Ending balance	0.0	0.6			0.0
Employee transition
Restructuring Reserve [Roll Forward]
Accruals	0.0		0.2		0.0	0.2
Employee transition | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			0.0	0.0		0.0
Cash payments			0.0	0.0
Ending balance			0.0	0.0		0.0
Employee transition | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			0.0	0.0		0.0
Accruals			0.0	0.0
Cash payments			0.0	0.0
Ending balance			0.0	0.0		0.0
Employee transition | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.0		0.0
Accruals	0.0	0.0	0.2
Cash payments	0.0	0.0	(0.2)
Ending balance	0.0	0.0	0.0	0.0	0.0	0.0
Employee transition | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0			0.0
Accruals	0.0	0.0
Cash payments	0.0	0.0
Ending balance	0.0	0.0			0.0
Severance payments
Restructuring Reserve [Roll Forward]
Accruals	(1.1)		14.8		(1.3)	14.3
Severance payments | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			0.1	1.4		1.4
Cash payments			(0.1)	(1.3)
Ending balance			0.0	0.1		0.0
Severance payments | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			1.2	5.3		5.3
Accruals			(0.1)	(0.5)
Cash payments			(0.5)	(3.6)
Ending balance			0.6	1.2		0.6
Severance payments | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	1.8	4.5	0.0		4.5
Accruals	(0.9)	0.0	14.8
Cash payments	(0.8)	(2.7)	0.0
Ending balance	0.1	1.8	14.8	0.0	0.1	14.8
Severance payments | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.6	1.9			1.9
Accruals	(0.2)	(0.2)
Cash payments	(0.4)	(1.1)
Ending balance	0.0	0.6			0.0
Employee benefits
Restructuring Reserve [Roll Forward]
Accruals	0.0		2.1		(1.1)	2.1
Employee benefits | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			0.0	0.0		0.0
Cash payments			0.0	0.0
Ending balance			0.0	0.0		0.0
Employee benefits | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			0.1	0.1		0.1
Accruals			0.0	0.0
Cash payments			(0.1)	0.0
Ending balance			0.0	0.1		0.0
Employee benefits | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.8	0.0		0.8
Accruals	0.0	(0.7)	2.2
Cash payments	0.0	(0.1)	0.0
Ending balance	0.0	0.0	$ 2.2	$ 0.0	0.0	$ 2.2
Employee benefits | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.5			0.5
Accruals	0.0	(0.4)
Cash payments	0.0	(0.1)
Ending balance	$ 0.0	$ 0.0			$ 0.0

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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