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Contingent consideration - Schedule of Changes in Contingent Consideration Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at Beginning $ 12.3 $ 9.6
Current period additions 13.4 2.8
Current period adjustments 3.2 7.6
Current period settlements (11.2) (8.1)
Foreign currency effect (0.4) 0.4
Balance at End $ 17.3 $ 12.3