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15. Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Data [Table Text Block]
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2015
 
 
 
 
 
 
 
 
Net sales
 
$
472.8

 
$
506.1

 
$
470.0

 
$
570.6

Gross profit
 
270.1

 
279.6

 
263.5

 
308.5

Net income attributable to Bio-Rad
 
17.8

 
28.4

 
17.4

 
49.5

Basic earnings per share
 
$
0.61

 
$
0.98

 
$
0.59

 
$
1.69

Diluted earnings per share
 
$
0.61

 
$
0.97

 
$
0.59

 
$
1.68

 
 
 
 
 
 
 
 
 
2014
 
 
 
 
 
 
 
 
Net sales
 
$
509.3

 
$
536.8

 
$
530.6

 
$
598.2

Gross profit
 
275.3

 
297.2

 
288.6

 
317.4

Net income attributable to Bio-Rad
 
6.7

 
31.6

 
11.5

 
39.0

Basic earnings per share
 
$
0.23

 
$
1.10

 
$
0.40

 
$
1.35

Diluted earnings per share
 
$
0.23

 
$
1.09

 
$
0.39

 
$
1.34