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Finance income (Tables)
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Schedule Of Finance Income
Finance income
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Bank interest received
0.2

 
0.2

 
0.2

 
 
Other interest received
0.3

 
0.3

 
0.3

 
 
Foreign exchange gains on financing activities
—

 
0.7

 
—

 
 
Total finance income
0.5

 
1.2

 
0.5