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Fair value measurements - Schedule of Contingent Consideration Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period $ 5.5 $ 5.6 $ 7.6 $ 8.0
Change in fair value 0.1 0.5 0.4 0.3
Settlements (1.3) (0.6) (0.6) (0.7)
Balance, end of period $ 4.3 $ 5.5 $ 7.4 $ 7.6