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7. Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2022
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, 202024,966 5,090 
Class B to Class A conversions32 (32)
Issuance of common stock75 18 
Balance at December 31, 202025,073 5,076 
Class B to Class A conversions16 (16)
Issuance of common stock45 18 
Balance at December 31, 202125,134 5,078 
Class B to Class A conversions20 (20)
Issuance of common stock8 16 
Balance at December 31, 202225,162 5,074 
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, 2022, 2021 and 2020 are summarized as follows:
Number of Shares PurchasedWeighted-Average Price per ShareTotal Shares Repurchased To DateRemaining Authorized Value
(in millions)
March 1, 2020 - March 31, 2020291,941 $342.55 573,577 $73.1 
March 1, 2021 - March 31, 202189,506 $558.60 663,083 $223.1 
May 1, 2022 - May 31, 2022255,284 $489.65 918,367 $98.1 
November 1, 2022 - November 30, 2022241,408 $375.63 1,159,775 $207.4