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Share Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Cost
Total share-based compensation expense for 2019, 2018 and 2017 was as follows:
 
December 31
In millions
2019
2018
2017
Restricted stock units
$
11.2

$
8.9

$
17.5

Stock options
4.5

4.6

10.5

Performance share units
5.7

7.4

11.6

Total share-based compensation expense
$
21.4

$
20.9

$
39.6
Stock Option Activity
The following table summarizes stock option activity under all plans for the year ended December 31, 2019:
Shares and intrinsic value in millions
Number of shares
Weighted-
average
exercise
price
Weighted-
average
remaining
contractual life
(years)
Aggregate
intrinsic
value
Outstanding as of January 1, 2019
4.1

$
35.77



Granted
0.4

39.05



Exercised
(0.6
)
26.92



Forfeited
(0.1
)
44.56



Outstanding as of December 31, 2019
3.8

$
37.29

5.2
$
34.1

Options exercisable as of December 31, 2019
2.9

$
36.08

4.2
$
30.2

Options expected to vest as of December 31, 2019
0.8

$
41.35

8.3
$
3.8
Stock Option Fair Value Assumptions
We estimated the fair value of each stock option award issued in the annual share-based compensation grant using a Black-Scholes option pricing model, modified for dividends and using the following assumptions:
 
December 31
 
2019

2018
 
2017
Risk-free interest rate
2.89
%

2.58
%
 
1.65
%
Expected dividend yield
1.78
%

1.56
%
 
2.35
%
Expected share price volatility
23.3
%

24.8
%
 
26.9
%
Expected term (years)
6.1


6.1

 
6.3
Restricted Stock Activity
The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2019:
Shares in millions
Number of
shares
Weighted
average
grant date
fair value
Outstanding as of January 1, 2019
0.5

$
41.74

Granted
0.3

41.08

Vested
(0.2
)
37.61

Outstanding as of December 31, 2019
0.6

$
42.16
Performance Shares Award Outstanding Activity
The following table summarizes performance share unit activity under all plans for the year ended December 31, 2019:
Shares in millions
Number of
shares
Weighted
average
grant date
fair value
Outstanding as of January 1, 2019
0.1

$
45.42

Granted
0.2

38.60

Outstanding as of December 31, 2019
0.3

$
41.62