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Revenue recognition - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, amount $ 296.9  
Contract with customer, asset, noncurrent 7.3 $ 9.7
Current portion of contract liabilities 4.9 $ 4.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, amount $ 227.5  
Revenue, remaining performance obligation, expected timing of satisfaction, period 24 months