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Long-lived asset impairment and restructuring charges - Schedule of Restructuring Reserve by Type of Cost (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Accruals	$ 29.3
January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	9.3
Cash payments	(7.9)
Ending balance	1.4
August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	20.0
Cash payments	(14.6)
Ending balance	5.4
Employee Transition
Restructuring Reserve [Roll Forward]
Accruals	0.6
Employee Transition | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	0.3
Cash payments	(0.3)
Ending balance	0.0
Employee Transition | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	0.3
Cash payments	(0.3)
Ending balance	0.0
Severance Payments
Restructuring Reserve [Roll Forward]
Accruals	27.0
Severance Payments | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	8.7
Cash payments	(7.3)
Ending balance	1.4
Severance Payments | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	18.3
Cash payments	(13.0)
Ending balance	5.3
Employee Benefits
Restructuring Reserve [Roll Forward]
Accruals	1.7
Employee Benefits | January 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	0.3
Cash payments	(0.3)
Ending balance	0.0
Employee Benefits | August 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
Accruals	1.4
Cash payments	(1.3)
Ending balance	$ 0.1

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
-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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- 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
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479823/420-10-S99-1

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X

- 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
-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/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

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- Definition

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+ References

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