Impairment and restructuring charges - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Accruals	$ 22.5	$ 29.3
January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	1.4	0.0
Accruals	0.0	9.3
Cash payments	(1.4)	(7.9)
Ending balance	0.0	1.4
August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	5.4	0.0
Accruals	(0.6)	20.0
Cash payments	(4.8)	(14.6)
Ending balance	0.0	5.4
May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	19.8
Cash payments	(14.5)
Ending balance	5.3	0.0
August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	3.3
Cash payments	(0.9)
Ending balance	2.4	0.0
Employee Transition
Restructuring Reserve [Roll Forward]
Accruals	0.3	0.6
Employee Transition \| January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0
Accruals	0.0	0.3
Cash payments	0.0	(0.3)
Ending balance	0.0	0.0
Employee Transition \| August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0
Accruals	0.0	0.3
Cash payments	0.0	(0.3)
Ending balance	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
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
Severance Payments
Restructuring Reserve [Roll Forward]
Accruals	19.3	27.0
Severance Payments \| January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	1.4	0.0
Accruals	0.0	8.7
Cash payments	(1.4)	(7.3)
Ending balance	0.0	1.4
Severance Payments \| August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	5.3	0.0
Accruals	(0.6)	18.3
Cash payments	(4.7)	(13.0)
Ending balance	0.0	5.3
Severance Payments \| May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	17.2
Cash payments	(12.7)
Ending balance	4.5	0.0
Severance Payments \| August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	2.6
Cash payments	(0.7)
Ending balance	1.9	0.0
Employee Benefits
Restructuring Reserve [Roll Forward]
Accruals	2.9	1.7
Employee Benefits \| January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0	0.0
Accruals	0.0	0.3
Cash payments	0.0	(0.3)
Ending balance	0.0	0.0
Employee Benefits \| August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	0.0
Accruals	0.0	1.4
Cash payments	(0.1)	(1.3)
Ending balance	0.0	0.1
Employee Benefits \| May 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	2.4
Cash payments	(1.6)
Ending balance	0.8	0.0
Employee Benefits \| August 2024 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	0.6
Cash payments	(0.1)
Ending balance	$ 0.5	$ 0.0

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

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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
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482047/420-10-45-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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