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SHARE-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the components and classification of share-based compensation expense
The following table summarizes the components and classification of share-based compensation expense related to stock options and restricted share units (“RSUs”) for the three-month and six-month periods ended June 30, 2014 and 2013:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
Stock options
$
4.2

 
$
4.8

 
$
9.3

 
$
8.2

RSUs
11.4

 
2.6

 
31.1

 
8.3

Share-based compensation expense
$
15.6

 
$
7.4

 
$
40.4

 
$
16.5

 
 
 
 
 
 
 
 
Research and development expenses
$
1.4

 
$
—

 
$
2.8

 
$
—

Selling, general and administrative expenses
14.2

 
7.4

 
37.6

 
16.5

Share-based compensation expense
$
15.6

 
$
7.4

 
$
40.4

 
$
16.5