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Share Plans (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Expense
Total share-based compensation expense for the quarters ended March 31, 2019, and April 1, 2018, was as follows:
 
 
First Quarter
 
 
In millions
2019
 
2018
 
 
 
Total share-based compensation charges
$
2.6

 
$
0.5

 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table illustrates the assumptions used in deriving the fair value of share options granted during the First Quarter of 2019 and the year-ended December 31, 2018,:
 
 
2019
 
2018
 
 
Dividend yield (%)
4.00
 
4.00
 
 
Expected volatility range (%)
 22.65 - 35.77
 
22.65 - 35.77
 
 
Risk-free interest rate (%)
0.12 - 2.57
 
0.12 - 2.57
 
 
Expected life of share options range (years)
1.00 - 4.00
 
0.50 - 6.00
 
 
Weighted average exercise price ($)
$0.89
 
$0.65
 
 
Model used
Black-Scholes & Monte-Carlo
 
Black-Scholes & Monte-Carlo