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Share Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost
Total share-based compensation expense for 2018, 2017 and 2016 was as follows:
 
December 31
In millions
2018
2017
2016
Restricted stock units
$
8.9

$
17.5

$
17.3

Stock options
4.6

10.5

10.4

Performance share units
7.4

11.6

6.5

Total share-based compensation expense
$
20.9

$
39.6

$
34.2
Stock Option Activity
The following table summarizes stock option activity under all plans for the year ended December 31, 2018:
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, 2018
5.2

$
28.80



Granted
0.5

45.42



Exercised
(0.8
)
23.52



Forfeited
(0.1
)
43.77



Spin-off adjustment
(0.7
)
—



Outstanding as of December 31, 2018
4.1

$
35.77

5.2
$
20.6

Options exercisable as of December 31, 2018
3.0

$
33.93

4.0
$
19.5

Options expected to vest as of December 31, 2018
1.1

$
40.55

8.2
$
1.2
Stock Option Fair Value Assumptions
We estimated the fair value of each stock option award on the date of grant using a Black-Scholes option pricing model, modified for dividends and using the following weighted average assumptions:
 
December 31
 
2018

2017
 
2016
Risk-free interest rate
2.58
%

1.65
%
 
1.56
%
Expected dividend yield
1.56
%

2.35
%
 
2.49
%
Expected share price volatility
24.8
%

26.9
%
 
27.3
%
Expected term (years)
6.1


6.3

 
5.9
Restricted Stock Activity
The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2018:
Shares in millions
Number of
shares
Weighted
average
grant date
fair value
Outstanding as of January 1, 2018
0.6

$
39.44

Granted
0.2

45.46

Vested
(0.6
)
43.89

Conversion of PSUs
0.5

—

Spin-off adjustment
(0.2
)
—

Outstanding as of December 31, 2018
0.5

$
41.74
Performance Shares Award Outstanding Activity
The following table summarizes performance share unit activity under all plans for the year ended December 31, 2018:
Shares in millions
Number of
shares
Weighted
average
grant date
fair value
Outstanding as of January 1, 2018
0.5

$
29.53

Granted
0.1

45.42

Conversion to RSUs
(0.5
)
—

Outstanding as of December 31, 2018
0.1

$
45.42