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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Share-based Compensation [Abstract]  
Share-Based Compensation Expense
The expense recognized for the three months ended March 31 were as follows:
 
Three months ended
In millions
2017
 
2016
Stock options
$
8.7

 
$
7.5

RSUs
10.3

 
9.5

Performance shares
4.4

 
4.5

Other
1.4

 
1.8

Pre-tax expense
24.8

 
23.3

Tax benefit
(9.5
)
 
(8.9
)
After-tax expense
$
15.3

 
$
14.4
Grants of Stock Options and RSUs
Grants issued during the three months ended March 31 were as follows:
 
2017
 
2016
 
Number
granted
 
Weighted-
average fair
value per award
 
Number
granted
 
Weighted-
average fair
value per award
Stock options
1,498,127

 
$
13.45

 
1,958,476

 
$
9.42

RSUs
310,868

 
$
79.76

 
457,351

 
$
50.31
Average fair value of stock options, assumptions
The following assumptions were used during the three months ended March 31:
 
 
2017
 
2016
Dividend yield
 
2.00
%
 
2.55
%
Volatility
 
22.46
%
 
28.60
%
Risk-free rate of return
 
1.80
%
 
1.12
%
Expected life in years
 
4.8

 
4.8