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7. Stockholders' Equity Stockholders' Equity Shares Detail (Tables)

12 Months Ended

Dec. 31, 2019

Class of Stock [Line Items]

Class of Treasury Stock [Table Text Block]

The share repurchase activity under the share repurchase program through open market transactions in 2018 and 2019 is summarized as follows:

	Number of Shares Purchased		Weighted-Average Price per Share			Total Shares Repurchased To Date		Remaining Authorized Value (in millions)
November 1, 2018 - November 30, 2018	178,911		$	273.39		193,150		$	201.1
May 1, 2019 - May 31, 2019	25,421		$	291.70		218,571		$	193.7
June 1, 2019 - June 30, 2019	25,977		$	292.01		244,548		$	186.1
August 1, 2019 - August 31, 2019	14,745		$	339.05		259,293		$	181.1
November 1, 2019 - November 30, 2019	22,343		$	358.04		281,636		$	173.1

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, 2017	24,454			5,124
B to A conversions	34			(34	)
Issuance of common stock	191			18
Balance at December 31, 2017	24,679			5,108
B to A conversions	30			(30	)
Issuance of common stock	175			18
Balance at December 31, 2018	24,884			5,096
B to A conversions	24			(24	)
Issuance of common stock	58			18
Balance at December 31, 2019	24,966			5,090

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