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Fair value measurements - Schedule of Contingent Consideration Roll Forward (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Unobservable Input Reconciliation [Roll Forward]      
Balance, beginning of period $ 7.4 $ 7.6 $ 8.0
Change in fair value (1.1) 0.4 0.3
Settlements (0.9) (0.6) (0.7)
Balance, end of period $ 5.4 $ 7.4 $ 7.6