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Share Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Movement in Number of Shares deld by ESOP Trustees
 
In millions
 
 
 
At January 1, 2017
$
(0.5
)
 
 
Transfer of treasury shares into ESOP
(0.8
)
 
 
Utilization of ESOP shares
0.3

 
 
At December 31, 2017
(1.0
)
 
 
Issue of new shares
(1.3
)
 
 
Shares sold from ESOP
0.4

 
 
Transfer of treasury shares into ESOP
(1.4
)
 
 
Utilization of ESOP shares
1.1

 
 
At December 31, 2018
$
(2.2
)
 
The change in the number of shares held by the Trustees of the ESOP and the number of share options held over those shares are shown below:
 
 
Number of shares held by ESOP Trustees
 
 
 
£0.0001 deferred shares
 
£0.50 ordinary shares
 
 
At January 1, 2018
15,977,968,688

 
104,709

 
 
New shares issued
—

 
1,863,201

 
 
Shares utilized during the year
—

 
(149,609
)
 
 
Shares transferred into ESOP during the year
—

 
120,000

 
 
Shares sold from the ESOP during the year
—

 
(317,000
)
 
 
At December 31, 2018
15,977,968,688

 
1,621,301

 
A
Schedule of Share-based Compensation Expense
Total share-based compensation expense for 2018, 2017 and 2016 was as follows:
 
 
Years ended December 31,
 
 
In millions
2018
 
2017
 
2016
 
 
Other share-based compensation charges
$
4.8

 
$
2.2

 
$
1.4

 
 
Restructuring share-based compensation charges
—

 
0.9

 
—

 
 
Total share-based compensation charges
$
4.8

 
$
3.1

 
$
1.4

 
Share-based Compensation, Stock Options, Activity
The following tables illustrates the number of, and movements in, share options during the year, with each option relating to 1 ordinary share:
 
 
Number of shares
 
Weighted- average exercise price
 
Weighted- average remaining contractual life (years)
 
Aggregate intrinsic value ($M)
 
 
At January 1, 2018
1,182,315

 
$
6.42

 
2.4
 
$
11.1

 
 
Granted during the year
510,536

 
$
0.67

 
 
 
 
 
 
Exercised during the year
(833,360
)
 
$
7.43

 
 
 
 
 
 
Accrued dividend awards
18,776

 
$
0.66

 
 
 
 
 
 
Lapsed during the year
(29,205
)
 
$
0.67

 
 
 
 
 
 
At December 31, 2018
849,062

 
$
2.10

 
1.9
 
$
13.3

 
 
Options exercisable at December 31, 2018
320,882

 
$
4.31

 
2.4
 
$
4.3

 
 
Options expected to vest as of December 31, 2018
528,180

 
$
0.64

 
1.5
 
$
9.0

 
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 during the year:
 
 
2018
 
2017
 
 
Dividend yield (%)
4.00
 
4.00
 
 
Expected volatility range (%)
 22.65 - 35.77
 
26.81 - 35.81
 
 
Risk-free interest rate (%)
0.12 - 2.57
 
1.00 - 2.01
 
 
Expected life of share options range (years)
0.50 - 6.00
 
0.50 - 7.36
 
 
Weighted average exercise price ($)
$0.65
 
$0.65
 
 
Model used
Black-Scholes & Monte-Carlo
 
Black-Scholes