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QUARTERLY DATA (UNAUDITED)
12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
QUARTERLY DATA (UNAUDITED)

The following is a summary of unaudited quarterly data:
 
Year ended December 31, 2011
 
1st
Quarter
 
2nd
Quarter
 
3rd
Quarter
 
4th
Quarter
 
Full
Year
Net sales
$
1,368.4

 
$
1,403.3

 
$
1,404.5

 
$
1,366.1

 
$
5,542.3

Gross profit
568.4

 
588.2

 
568.5

 
549.6

 
2,274.7

Net earnings attributable to Laboratory Corporation of America Holdings
127.1

 
122.9

 
134.3

 
135.4

 
519.7

Basic earnings per common share
1.27

 
1.22

 
1.34

 
1.36

 
5.20

Diluted earnings per common share
1.23

 
1.20

 
1.31

 
1.34

 
5.11


 
Year ended December 31, 2010
 
1st
Quarter
 
2nd
Quarter
 
3rd
Quarter
 
4th
Quarter
 
Full
Year
Net sales
$
1,193.6

 
$
1,238.4

 
$
1,276.5

 
$
1,295.4

 
$
5,003.9

Gross profit
506.9

 
533.6

 
527.7

 
529.6

 
2,097.8

Net earnings attributable to Laboratory Corporation of America Holdings
132.7

 
153.7

 
140.0

 
131.8

 
558.2

Basic earnings per common share
1.27

 
1.48

 
1.37

 
1.29

 
5.42

Diluted earnings per common share
1.25

 
1.46

 
1.34

 
1.26

 
5.29