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7. Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Stock by Class [Table Text Block]
Changes to Bio-Rad's issued common stock shares are as follows (in thousands):
Class A SharesClass B Shares
Balance at January 1, 201824,679 5,108 
Class B to Class A conversions30 (30)
Issuance of common stock175 18 
Balance at December 31, 201824,884 5,096 
Class B to Class A conversions24 (24)
Issuance of common stock58 18 
Balance at December 31, 201924,966 5,090 
Class B to Class A conversions32 (32)
Issuance of common stock75 18 
Balance at December 31, 202025,073 5,076 
Class of Treasury Stock [Table Text Block] The share repurchase activity under the share repurchase program through open market transactions for the years ended December 31, 2020, 2019 and 2018 are summarized as follows:
Number of Shares PurchasedWeighted-Average Price per ShareTotal Shares Repurchased To DateRemaining Authorized Value
(in millions)
November 1, 2018 - November 30, 2018178,911 $273.39 193,150 $201.1 
May 1, 2019 - May 31, 201925,421 $291.70 218,571 $193.7 
June 1, 2019 - June 30, 201925,977 $292.01 244,548 $186.1 
August 1, 2019 - August 31, 201914,745 $339.05 259,293 $181.1 
November 1, 2019 - November 30, 201922,343 $358.04 281,636 $173.1 
March 1, 2020 - March 31, 2020291,941 $342.55 573,577 $73.1