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2. Fair Value Measurements 3. Contingent Consideration (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability [1] $ 0.0 $ 0.7
[1] Contingent consideration liabilities in a liability position are included in the other long-term liabilities in the condensed consolidated balance sheets.