Defined contribution and defined benefit retirement plans - Schedule of Plans for which Accumulated Benefit Obligations Exceeds Plan Assets (Details) - Pension Plans - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
UNITED STATES
Plans for which the ABO exceeds plan assets:
Projected benefit obligations	$ 0.1	$ 0.1
Accumulated benefit obligations	0.1	0.1
Non-U.S.
Plans for which the ABO exceeds plan assets:
Projected benefit obligations	429.4	397.1
Accumulated benefit obligations	421.5	387.1
Fair value of plan assets	$ 348.2	$ 279.5

Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-3

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant