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Retirement plans - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Total net pension obligations	$ 68.3
Retirement Plans | Accrued Liabilities
Defined Benefit Plan Disclosure [Line Items]
Total net pension obligations	9.7
SERP
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	4.2	$ 2.8
Additional cash payments	1.0
TRP
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	0.0	$ 3.7
Additional cash payments	$ 0.0

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