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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Reconciliation of change in fair value of contingent consideration  
Beginning balance $ 10.9
Payment of contingent consideration (3.3)
Change in fair value recognized in the income statement 1.7
Translation adjustments recognized in other comprehensive loss (0.5)
Ending balance $ 8.8