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Share Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Share-based Compensation Expense
Total share-based compensation expense for the three and nine months ended September 30, 2016 and September 26, 2015 was as follows:
 
Three months ended    
 
Nine months ended
In millions
September 30,
2016
September 26,
2015
 
September 30,
2016
September 26,
2015
Restricted stock units
$
3.6

$
5.4

 
$
14.2

$
17.9

Stock options
1.8

2.7

 
9.0

9.6

Performance share units
1.0

—

 
5.5

—

Total share-based compensation expense
$
6.4

$
8.1

 
$
28.7

$
27.5
Assumptions Used in Calculating Estimated Fair Value of Stock Option Award
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:
 
2016
Annual Grant
Risk-free interest rate
1.57
%
Expected dividend yield
2.47
%
Expected share price volatility
27.3
%
Expected term (years)
5.9