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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Compensation [Abstract]  
Share-Based Compensation Expense The expense recognized for the three and nine months ended September 30 was as follows:
 
Three months ended
 
Nine months ended
In millions
2019
 
2018
 
2019
 
2018
Stock options
$
2.9

 
$
3.1

 
$
17.5

 
$
21.1

RSUs
4.1

 
4.6

 
22.9

 
26.6

Performance shares
5.8

 
4.7

 
12.7

 
16.0

Deferred compensation
0.8

 
0.9

 
2.3

 
2.6

Other
(0.2
)
 
1.0

 
2.7

 
1.3

Pre-tax expense
13.4

 
14.3

 
58.1

 
67.6

Tax benefit
(3.3
)
 
(3.5
)
 
(14.1
)
 
(16.5
)
After-tax expense
$
10.1

 
$
10.8

 
$
44.0

 
$
51.1
Grants of Stock Options and RSUs
Grants issued during the nine months ended September 30 were as follows:
 
2019
 
2018
 
Number
granted
 
Weighted-
average fair
value per award
 
Number
granted
 
Weighted-
average fair
value per award
Stock options
1,285,257

 
$
17.17

 
1,524,625

 
$
15.49

RSUs
265,964

 
$
102.81

 
317,073

 
$
89.69

Performance shares (1)
311,158

 
$
111.04

 
357,096

 
$
106.06


(1) The number of performance shares represents the maximum award level.
Average fair value of stock options, assumptions The following assumptions were used during the nine months ended September 30:
 
 
2019
 
2018
Dividend yield
 
2.06
%
 
2.00
%
Volatility
 
21.46
%
 
21.64
%
Risk-free rate of return
 
2.46
%
 
2.48
%
Expected life in years
 
4.8

 
4.8