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2. Fair Value Measurements 3. Contingent Consideration (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Distributor [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration milestone payments $ (1.4) $ (0.7)  
Sales milestone minimum amount [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration milestone payments (0.6)    
Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability [1] 0.1   $ 0.7
Other Noncurrent Liabilities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability [1] 0.1   0.1
Other Current Liabilities [Member] | 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   $ 0.6
[1] Contingent consideration liability is included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2021December 31, 2020
Other current liabilities$— $0.6 
Other long-term liabilities0.1 0.1 
   Total$0.1 $0.7