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7. Stockholders' Equity (Tables) | 12 Months Ended
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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 Shares |  | Class B Shares
Balance at January 1, 2020 | 24,966 |  |  | 5,090 |
Class B to Class A conversions | 32 |  |  | (32) |
Issuance of common stock | 75 |  |  | 18 |
Balance at December 31, 2020 | 25,073 |  |  | 5,076 |
Class B to Class A conversions | 16 |  |  | (16) |
Issuance of common stock | 45 |  |  | 18 |
Balance at December 31, 2021 | 25,134 |  |  | 5,078 |
Class B to Class A conversions | 20 |  |  | (20) |
Issuance of common stock | 8 |  |  | 16 |
Balance at December 31, 2022 | 25,162 |  |  | 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 Purchased | Weighted-Average Price per Share | Total Shares Repurchased To Date | Remaining Authorized Value (in millions)
March 1, 2020 - March 31, 2020 | 291,941 |  | $ | 342.55 |  | 573,577 |  | $ | 73.1 |
March 1, 2021 - March 31, 2021 | 89,506 |  | $ | 558.60 |  | 663,083 |  | $ | 223.1 |
May 1, 2022 - May 31, 2022 | 255,284 |  | $ | 489.65 |  | 918,367 |  | $ | 98.1 |
November 1, 2022 - November 30, 2022 | 241,408 |  | $ | 375.63 |  | 1,159,775 |  | $ | 207.4 |

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