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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period $ 37.2 $ 58.1 $ 29.2
Expense included in earnings 2.6 2.9 31.7
Settlements (33.0) (23.8) (2.8)
Balance, end of period $ 6.8 $ 37.2 $ 58.1