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Share based compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Share-Based Payment Arrangements [Abstract]  
Information about share-based compensation charges
 
 
2017
 
2016
 
2015
 
 
 
$M
$M
 
$M
 
 
I.P.O. related share based compensation charges
—

 
—

 
0.1

 
 
Other share based compensation charges
2.2

 
1.4

 
1.3

 
 
Restructuring share based compensation charges
0.9

 
—

 
—

 
 
 
3.1

 
1.4

 
1.4

 
Disclosure of number and weighted average exercise prices of share options
The movement 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, 2017
15,977,968,688

 
55,816

 
 
Shares utilized during the year
—

 
(34,594
)
 
 
Shares transferred into ESOP during the year
—

 
83,487

 
 
At December 31, 2017
15,977,968,688

 
104,709

 
The following table illustrates the number of, and movements in, share options during the year, with each option relating to 1 ordinary share:
 
 
2017
 
2017
 
2016
 
2016
 
 
 
Number
 
Weighted average exercise price
 
Number
 
Weighted average exercise price
 
 
At January 1
963,789

 
$8.51
 
1,144,534

 
$7.26
 
 
Granted during the year
386,614

 
$0.65
 
107,660

 
$0.67
 
 
Exercised during the year
(172,501
)
 
$(5.03)
 
(132,599
)
 
$(0.67)
 
 
Accrued dividend awards
12,258

 
$0.65
 
12,572

 
$0.67
 
 
Lapsed during the year
(7,845
)
 
$(0.65)
 
(168,378
)
 
$(0.67)
 
 
At December 31
1,182,315

 
$6.42
 
963,789

 
$8.51
 
Disclosure of assumptions used in deriving fair value of share options
The following table illustrates the assumptions used in deriving the fair value of share options during the year:
 
 
2017
 
2016
 
 
Dividend yield (%)
4.00
 
4.00
 
 
Expected volatility range (%)
26.81 - 35.81
 
29.73 – 38.73
 
 
Risk-free interest rate (%)
1.00 - 2.01
 
0.36 – 1.05
 
 
Expected life of share options range (years)
0.50 - 7.36
 
1 - 3.5
 
 
Weighted average exercise price ($)
$0.65
 
$0.67
 
 
Model used
Black-Scholes
 
Black-Scholes