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Share Plans (Tables)
 6 Months Ended
Jun. 27, 2015
Share-based Compensation Expense
Total share-based compensation expense for the three and six months ended June 27, 2015 and June 28, 2014 was as follows:
 
Three months ended    
 
Six months ended
In millions
June 27,
2015
June 28,
2014
 
June 27,
2015
June 28,
2014
Restricted stock units
$
6.3

$
6.2

 
$
12.5

$
11.1

Stock options
3.4

2.9

 
6.9

5.4

Total share-based compensation expense
$
9.7

$
9.1

 
$
19.4

$
16.5
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:
 
2015
Annual Grant
Risk-free interest rate
1.61
%
Expected dividend yield
1.96
%
Expected share price volatility
30.4
%
Expected term (years)
6.0