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Revenue recognition - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 322.5
Contract with customer, asset, noncurrent	2.3	$ 9.7
Current portion of contract liabilities	6.1	$ 4.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 259.2
Revenue, remaining performance obligation, expected timing of satisfaction, period	24 months

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent.

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