Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Components of share-based compensation expense
The following table summarizes the components of share-based compensation expense in the Consolidated Statements of Income for the three-month periods ended March 31, 2015 and 2014:
 
 
Three-Month Periods Ended March 31,
 
2015
 
2014
Cost of goods sold (excluding amortization of acquired intangible assets)
$
6.7

 
$
6.1

Research and development
56.2

 
47.0

Selling, general and administrative
65.9

 
51.3

Total share-based compensation expense
128.8

 
104.4

Tax benefit related to share-based compensation expense
36.4

 
30.0

Reduction in income
$
92.4

 
$
74.4
Summary of activity for stock options, RSUs and PSUs
The following table summarizes the activity for stock options, RSUs and PSUs for the three-month period ended March 31, 2015 (in millions unless otherwise noted):
 
Stock
Options
 
Restricted Stock
Units
 
Performance-
Based Restricted
Stock Units
(in thousands)
Outstanding at December 31, 2014
77.2

 
9.4

 
133

Changes during the Year:
 

 
 

 
 

Granted
2.8

 
0.1

 
73

Exercised / Released
(3.7
)
 
(0.2
)
 
—

Forfeited
(0.4
)
 
(0.2
)
 
(2
)
Outstanding at March 31, 2015
75.9

 
9.1


204
Schedule of unvested awards compensation cost not yet recognized and weighted-average periods for recognition
Total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized at March 31, 2015 were as follows (dollars in millions):
 
Stock
Options
 
Restricted Stock
Units
 
Performance-
Based Restricted
Stock Units
Unrecognized compensation cost
$
573.8

 
$
227.7

 
$
13.3

Expected weighted-average period in years of compensation cost to be recognized
2.1

 
1.0

 
2.0