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Fair value measurements - Reconciliation of the Contingent Consideration Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period $ 8.0 $ 38.4 $ 59.3
Change in fair value 0.2 2.6 2.9
Settlements (2.6) (33.0) (23.8)
Balance, end of period $ 5.6 $ 8.0 $ 38.4