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Fair value measurements - Schedule of Contingent Consideration Roll Forward (Details) - Contingent Consideration - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period $ 5.6 $ 8.0
Change in fair value 0.6 0.2
Settlements (2.3) (2.6)
Sales (3.9)  
Balance, end of period $ 0.0 $ 5.6