Defined contribution and defined benefit retirement plans - Schedule of Defined Benefit Plan Expected Future Payments (Details) - Pension plans defined benefit $ in Millions	Dec. 31, 2024 USD ($)
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2025	$ 29.9
2026	30.5
2027	32.5
2028	37.4
2029	36.0
Next 5 years	$ 175.9

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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- Definition

Pension plans postretirement and other employee benefits.

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