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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, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Reserve [Roll Forward]
Accruals	$ 17.1		$ (0.1)		$ 16.6	$ 9.6
January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	$ 1.4	7.4	$ 0.0	1.4	0.0
Accruals			(0.1)	9.7
Cash payments	(0.1)	(1.3)	(3.7)	(2.3)
Ending balance	0.0	0.1	3.6	7.4	0.0	3.6
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	0.0
Accruals	17.2
Cash payments	(0.2)
Ending balance	17.0	0.0			17.0
Employee transition
Restructuring Reserve [Roll Forward]
Accruals	0.2		0.0		0.2	0.3
Employee transition | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.1	0.0	0.0	0.0
Accruals			0.0	0.3
Cash payments	0.0	0.0	0.0	(0.2)
Ending balance	0.0	0.0	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
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
Accruals	0.2
Cash payments	(0.2)
Ending balance	0.0	0.0			0.0
Severance payments
Restructuring Reserve [Roll Forward]
Accruals	14.8		0.1		14.3	8.8
Severance payments | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	1.4	6.7	0.0	1.4	0.0
Accruals			0.1	8.7
Cash payments	(0.1)	(1.3)	(3.6)	(2.0)
Ending balance	0.0	0.1	3.2	6.7	0.0	3.2
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	0.0
Accruals	14.8
Cash payments	0.0
Ending balance	14.8	0.0			14.8
Employee benefits
Restructuring Reserve [Roll Forward]
Accruals	2.1		(0.2)		2.1	0.5
Employee benefits | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0	0.6	0.0	0.0	0.0
Accruals			(0.2)	0.7
Cash payments	0.0	0.0	(0.1)	(0.1)
Ending balance	0.0	0.0	$ 0.3	$ 0.6	0.0	$ 0.3
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
Accruals	2.2
Cash payments	0.0
Ending balance	$ 2.2	$ 0.0			$ 2.2

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
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-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
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-Publisher FASB
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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 420
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

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