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Fair Value of Financial Instruments - Changes in Contingent Consideration (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Business Combination, Contingent Consideration, Liability [Roll Forward]  
Beginning balance $ 17.4
Acquisitions 0.0
Measurement adjustments recorded to earnings 0.4
Foreign currency translation adjustment (0.4)
Ending balance $ 17.4