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Impairment and restructuring charges - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Reserve [Roll Forward]
Accruals	$ 0.3			$ 6.3			$ (2.1)	$ 22.9
January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.0	$ 0.1	$ 1.4		1.4
Cash payments					(0.1)	(1.3)
Ending balance				0.0	0.0	0.1		0.0
August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.6	1.3	5.4		5.4
Accruals					(0.1)	(0.5)
Cash payments				(0.3)	(0.6)	(3.6)
Ending balance				0.3	0.6	1.3		0.3
May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	$ 1.8	$ 5.3	17.0	0.0	0.0	5.3	0.0
Accruals	0.3	(0.9)	(0.7)	2.8	17.2
Cash payments	(0.4)	(0.8)	(2.8)	(7.0)	(0.2)
Ending balance	0.0	0.1	1.8	12.8	17.0	0.0	0.0	12.8
August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.6	2.4	0.0	0.0	0.0	2.4	0.0
Accruals		(0.2)	(0.6)	3.5
Cash payments		(0.4)	(1.2)	(0.1)
Ending balance	0.0	0.0	0.6	3.4	0.0	0.0	0.0	3.4
Employee transition
Restructuring Reserve [Roll Forward]
Accruals	0.0			0.1			0.0	0.3
Employee transition | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.0	0.0	0.0		0.0
Cash payments					0.0	0.0
Ending balance				0.0	0.0	0.0		0.0
Employee transition | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.0	0.0	0.0		0.0
Accruals					0.0	0.0
Cash payments				0.0	0.0	0.0
Ending balance				0.0	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	0.0	0.0	0.0	0.0
Accruals	0.0	0.0	0.0	0.0	0.2
Cash payments	0.0	0.0	0.0	0.0	(0.2)
Ending balance	0.0	0.0	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	0.0	0.0	0.0	0.0	0.0
Accruals		0.0	0.0	0.1
Cash payments		0.0	0.0	(0.1)
Ending balance	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Severance payments
Restructuring Reserve [Roll Forward]
Accruals	0.0			5.0			(1.3)	19.3
Severance payments | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.0	0.1	1.4		1.4
Cash payments					(0.1)	(1.3)
Ending balance				0.0	0.0	0.1		0.0
Severance payments | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.6	1.2	5.3		5.3
Accruals					(0.1)	(0.5)
Cash payments				(0.3)	(0.5)	(3.6)
Ending balance				0.3	0.6	1.2		0.3
Severance payments | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	1.8	4.5	14.8	0.0	0.0	4.5	0.0
Accruals	0.0	(0.9)	0.0	2.3	14.8
Cash payments	(0.1)	(0.8)	(2.7)	(6.3)	0.0
Ending balance	0.0	0.1	1.8	10.8	14.8	0.0	0.0	10.8
Severance payments | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.6	1.9	0.0	0.0	0.0	1.9	0.0
Accruals		(0.2)	(0.2)	2.7
Cash payments		(0.4)	(1.1)	0.0
Ending balance	0.0	0.0	0.6	2.7	0.0	0.0	0.0	2.7
Employee benefits
Restructuring Reserve [Roll Forward]
Accruals	0.3			1.2			(0.8)	3.3
Employee benefits | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.0	0.0	0.0		0.0
Cash payments					0.0	0.0
Ending balance				0.0	0.0	0.0		0.0
Employee benefits | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance				0.0	0.1	0.1		0.1
Accruals					0.0	0.0
Cash payments				0.0	(0.1)	0.0
Ending balance				0.0	0.0	0.1		0.0
Employee benefits | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.8	2.2	0.0	0.0	0.8	0.0
Accruals	0.3	0.0	(0.7)	0.5	2.2
Cash payments	(0.3)	0.0	(0.1)	(0.7)	0.0
Ending balance	0.0	0.0	0.0	2.0	2.2	0.0	0.0	2.0
Employee benefits | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.5	0.0	0.0	0.0	0.5	0.0
Accruals		0.0	(0.4)	0.7
Cash payments		0.0	(0.1)	0.0
Ending balance	$ 0.0	$ 0.0	$ 0.0	$ 0.7	$ 0.0	$ 0.0	$ 0.0	$ 0.7

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