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Income taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Taxes [Abstract]  
Analysis of taxation charge for the year
Analysis of taxation charge for the year
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Current income taxes:
 
 
 
 
 
 
 
U.K. corporation tax
—

 
—

 
0.3

 
 
Adjustments in respect of previous years
(0.3
)
 
0.2

 
(0.4
)
 
 
 
(0.3
)
 
0.2

 
(0.1
)
 
 
Non-U.K. tax
6.3

 
3.5

 
7.2

 
 
Adjustments in respect of previous years
(0.8
)
 
—

 
(0.9
)
 
 
Total current tax charge
5.2

 
3.7

 
6.2

 
 
Deferred income taxes:
 

 
 

 
 

 
 
Origination and reversal of temporary differences
(5.3
)
 
2.1

 
2.7

 
 
Adjustments in respect of previous years
0.5

 
0.2

 
0.6

 
 
Total deferred income taxes (credit) / charge
(4.8
)
 
2.3

 
3.3

 
 
Tax on profit on operations
0.4

 
6.0

 
9.5

 
Factors affecting the taxation charge for the year
The differences are explained below:
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Profit on operations before taxation
11.9

 
27.9

 
25.6

 
 
Profit on operations at 2017 standard rate of corporation tax in the U.K. of 19.25% (2016: 20% and 2015: 20.25%)
2.3

 
5.6

 
5.2

 
 
Effects of:
 

 
 

 
 

 
 
(Income not taxable) / non-deductible expenses
0.1

 
0.2

 
2.4

 
 
Unprovided deferred income taxes
0.3

 
(2.9
)
 
—

 
 
Foreign tax rate differences
4.3

 
2.7

 
2.6

 
 
Effect of U.S. tax reform
(6.0
)
 
—

 
—

 
 
Adjustment in respect of previous years
(0.6
)
 
0.4

 
(0.7
)
 
 
Tax expense
0.4

 
6.0

 
9.5