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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, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Accruals	$ 6.3			$ 20.3			$ 22.9	$ 29.9
January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	$ 0.1	$ 1.4	3.6	$ 7.4	$ 0.0	1.4	0.0
Accruals	0.0			(0.2)	(0.1)	9.7
Cash payments	0.0	(0.1)	(1.3)	(1.1)	(3.7)	(2.3)
Ending balance	0.0	0.0	0.1	2.3	3.6	7.4	0.0	2.3
August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.6	1.3	5.4	0.0			5.4
Accruals	0.0	(0.1)	(0.5)	20.5
Cash payments	(0.3)	(0.6)	(3.6)	(1.9)
Ending balance	0.3	0.6	1.3	18.6	0.0		0.3	18.6
May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	17.0	0.0
Accruals	2.8	17.2
Cash payments	(7.0)	(0.2)
Ending balance	12.8	17.0	0.0				12.8
August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	3.5
Cash payments	(0.1)
Ending balance	3.4	0.0					3.4
Employee transition
Restructuring Reserve [Roll Forward]
Accruals	0.1			0.3			0.3	0.6
Employee transition | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.0	0.1	0.1	0.0	0.0	0.0
Accruals	0.0			0.0	0.0	0.3
Cash payments	0.0	0.0	0.0	0.0	0.0	(0.2)
Ending balance	0.0	0.0	0.0	0.1	0.1	0.1	0.0	0.1
Employee transition | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.0	0.0			0.0
Accruals	0.0	0.0	0.0	0.3
Cash payments	0.0	0.0	0.0	(0.2)
Ending balance	0.0	0.0	0.0	0.1	0.0		0.0	0.1
Employee transition | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0
Accruals	0.0	0.2
Cash payments	0.0	(0.2)
Ending balance	0.0	0.0	0.0				0.0
Employee transition | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	0.1
Cash payments	(0.1)
Ending balance	0.0	0.0					0.0
Severance payments
Restructuring Reserve [Roll Forward]
Accruals	5.0			17.9			19.3	26.6
Severance payments | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.1	1.4	3.2	6.7	0.0	1.4	0.0
Accruals	0.0			0.0	0.1	8.7
Cash payments	0.0	(0.1)	(1.3)	(1.1)	(3.6)	(2.0)
Ending balance	0.0	0.0	0.1	2.1	3.2	6.7	0.0	2.1
Severance payments | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.6	1.2	5.3	0.0			5.3
Accruals	0.0	(0.1)	(0.5)	17.9
Cash payments	(0.3)	(0.5)	(3.6)	(1.7)
Ending balance	0.3	0.6	1.2	16.2	0.0		0.3	16.2
Severance payments | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	14.8	0.0
Accruals	2.3	14.8
Cash payments	(6.3)	0.0
Ending balance	10.8	14.8	0.0				10.8
Severance payments | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	2.7
Cash payments	0.0
Ending balance	2.7	0.0					2.7
Employee benefits
Restructuring Reserve [Roll Forward]
Accruals	1.2			2.1			3.3	2.7
Employee benefits | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.0	0.3	0.6	0.0	0.0	0.0
Accruals	0.0			(0.2)	(0.2)	0.7
Cash payments	0.0	0.0	0.0	0.0	(0.1)	(0.1)
Ending balance	0.0	0.0	0.0	0.1	0.3	$ 0.6	0.0	0.1
Employee benefits | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.1	0.1	0.0			0.1
Accruals	0.0	0.0	0.0	2.3
Cash payments	0.0	(0.1)	0.0
Ending balance	0.0	0.0	0.1	$ 2.3	$ 0.0		0.0	$ 2.3
Employee benefits | May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	2.2	0.0
Accruals	0.5	2.2
Cash payments	(0.7)	0.0
Ending balance	2.0	2.2	$ 0.0				2.0
Employee benefits | August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	0.7
Cash payments	0.0
Ending balance	$ 0.7	$ 0.0					$ 0.7

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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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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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