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Share Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Share-based Compensation Expense
Total share-based compensation expense for the three and six months ended June 30, 2016 and June 27, 2015 was as follows:
 
Three months ended    
 
Six months ended
In millions
June 30,
2016
June 27,
2015
 
June 30,
2016
June 27,
2015
Restricted stock units
$
3.6

$
6.3

 
$
10.6

$
12.5

Stock options
1.8

3.4

 
7.2

6.9

Performance share units
0.8

—

 
4.5

—

Total share-based compensation expense
$
6.2

$
9.7

 
$
22.3

$
19.4
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