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Fair value measurements - Contingent Consideration Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period $ 37.2  
Changes in fair value of contingent consideration 0.5 $ 1.1
Settlements (30.1)  
Balance, end of period $ 7.6