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Fair value measurements - Contingent Consideration Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period     $ 37.2  
Change in fair value $ 0.6 $ 0.9 2.4 $ 2.6
Settlements     (31.8)  
Balance, end of period $ 7.8   $ 7.8