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Defined benefit pension plans - Components of Net Periodic Defined Benefit Pension Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Defined benefit pension plans [Line Items]
Service cost	$ 1.5	$ 1.6	$ 4.4	$ 4.9
Interest cost	6.0	5.3	17.3	15.9
Expected return on plan assets	(6.1)	(5.5)	(17.5)	(16.7)
Recognized net actuarial losses	0.8	1.0	2.4	2.9
Total	2.2	$ 2.4	6.6	$ 7.0
Defined benefit plan pension asset	22.0		22.0		$ 19.8
Defined Benefit Pension Plans
Defined benefit pension plans [Line Items]
Expected contribution	$ 16.0		$ 16.0
Defined Benefit Pension Plans | UNITED STATES
Defined benefit pension plans [Line Items]
Defined benefit plan benefit obligation					65.2
Defined benefit plan fair value of plan assets					75.7
Defined benefit plan pension asset					$ 10.7

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

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