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Dividends paid and proposed
 12 Months Ended
Dec. 31, 2017
Disclosure Of Dividends [Abstract]  
Dividends paid and proposed
Dividends paid and proposed
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Dividends declared and paid during the year:
 

 
 

 
 

 
 
Interim dividend paid February 4, 2015 ($0.10 per ordinary share)
—

 
—

 
2.7

 
 
Interim dividend paid May 6, 2015 ($0.10 per ordinary share)
—

 
—

 
2.7

 
 
Interim dividend paid August 5, 2015 ($0.10 per ordinary share)
—

 
—

 
2.7

 
 
Interim dividend paid November 4, 2015 ($0.10 per ordinary share)
—

 
—

 
2.7

 
 
Interim dividend paid February 3, 2016 ($0.125 per ordinary share)
—

 
3.4

 
—

 
 
Interim dividend paid May 4, 2016 ($0.125 per ordinary share)
—

 
3.3

 
—

 
 
Interim dividend paid August 3, 2016 ($0.125 per ordinary share)
—

 
3.3

 
—

 
 
Interim dividend paid November 2, 2016 ($0.125 per ordinary share)
—

 
3.3

 
—

 
 
Interim dividend paid February 1, 2017 ($0.125 per ordinary share)
3.3

 
—

 
—

 
 
Interim dividend paid May 3, 2017 ($0.125 per ordinary share)
3.3

 
—

 
—

 
 
Interim dividend paid August 2, 2017 ($0.125 per ordinary share)
3.3

 
—

 
—

 
 
Interim dividend paid November 1, 2017 ($0.125 per ordinary share)
3.4

 
—

 
—

 
 
 
13.3

 
13.3

 
10.8

 
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Dividends declared and paid after December 31 (not recognized as a liability at December 31):
 

 
 

 
 

 
 
Interim dividend paid February 3, 2016: ($0.125 per ordinary share)
—

 
—

 
2.7

 
 
Interim dividend paid February 1, 2017: ($0.125 per ordinary share)
—

 
3.3

 
—

 
 
Interim dividend paid February 7, 2018: ($0.125 per ordinary share)
3.4

 
—

 
—

 
 
 
3.4

 
3.3

 
2.7

 
 
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