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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Share-based Compensation [Abstract] 
Share-Based Compensation Expense
The following table summarizes the expenses recognized for the three and nine months ended September 30:
 
Three months ended
 
Nine months ended
In millions
2011
 
2010
 
2011
 
2010
Stock options
$
4.4

 
$
5.6

 
$
17.6

 
$
25.6

RSUs
3.9

 
2.8

 
16.4

 
11.0

Performance shares
(3.8
)
 
3.6

 
(2.7
)
 
9.2

Deferred compensation
0.2

 
0.3

 
0.6

 
1.0

SARs and other
(1.8
)
 
0.1

 
(1.3
)
 
0.8

Pre-tax expense
2.9

 
12.4

 
30.6

 
47.6

Tax benefit
(1.1
)
 
(4.7
)
 
(11.7
)
 
(18.2
)
After-tax expense
$
1.8

 
$
7.7

 
$
18.9

 
$
29.4

Grants of Stock Options and RSUs
The following table illustrates those granted during the nine months ended September 30:
 
2011
 
2010
 
Number
granted
 
Weighted-
average fair
value per award
 
Number
granted
 
Weighted-
average fair
value per award
Stock options
1,591,738

 
$
14.59

 
2,614,967

 
$
10.14

RSUs
542,881

 
$
47.05

 
833,465

 
$
32.19