Share Plans (Tables)

9 Months Ended

Sep. 26, 2015

Share-based Compensation Expense

Total share-based compensation expense for the three and nine months ended September 26, 2015 and September 27, 2014 was as follows:

	Three months ended				Nine months ended
In millions	September 26, 2015		September 27, 2014		September 26, 2015		September 27, 2014
Restricted stock units	$	5.4	$	5.6	$	17.9	$	16.7
Stock options	2.7		2.7		9.6		8.1
Total share-based compensation expense	$	8.1	$	8.3	$	27.5	$	24.8

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