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Fair value measurements - Contingent Consideration Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
Jun. 30, 2023
Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period $ 6.8 $ 6.8
Change in fair value 1.5 0.4
Settlements (0.7) (0.6)
Balance, end of period $ 7.6 $ 7.4