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15. Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Data [Table Text Block]
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
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

 
 
 
 
 
 
 
 
 
2013
 
 
 
 
 
 
 
 
Net sales
 
$
499.7

 
$
525.3

 
$
505.1

 
$
602.6

Gross profit
 
271.4

 
300.1

 
284.2

 
322.7

Net income (loss) attributable to Bio-Rad
 
20.2

 
34.6

 
(7.1
)
 
30.1

Basic earnings (loss) per share
 
$
0.71

 
$
1.21

 
$
(0.25
)
 
$
1.05

Diluted earnings (loss) per share
 
$
0.70

 
$
1.20

 
$
(0.25
)
 
$
1.04