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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2012
Share-based Compensation [Abstract]  
Share-Based Compensation Expense
The following table summarizes the expenses recognized for the three months ended March 31:
In millions
2012
 
2011
Stock options
$
(6.7
)
 
$
8.2

RSUs
8.0

 
2.8

PSUs
5.6

 
4.1

Deferred compensation
0.4

 
—

Other
1.3

 
0.6

Pre-tax expense
8.6

 
15.7

Tax benefit
(3.3
)
 
(6.0
)
After-tax expense
$
5.3

 
$
9.7
Grants of Stock Options and RSUs
The following table illustrates those granted during the three months ended March 31:
Average fair value of stock options, assumptions
The average fair value of the stock options granted is determined using the Black-Scholes option-pricing model. The following assumptions were used during the three months ended March 31:
 
 
2012
 
2011
Dividend yield
 
1.33
%
 
1.33
%
Volatility
 
43.60
%
 
34.81
%
Risk-free rate of return
 
0.92
%
 
2.45
%
Expected life (in years)
 
5.14

 
5.30