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Reserves (Tables)
 12 Months Ended
Dec. 31, 2017
Share Capital, Reserves And Other Equity Interest [Abstract]  
Disclosure of reserves within equity
 
 
Retained
earnings
 
Hedging
reserve
 
Translation
reserve
 
Share based
compensation
reserve
 
Merger
reserve
 
 
 
$M
 
$M
 
$M
 
$M
 
$M
 
 
At January 1, 2015
308.8

 
0.9

 
(36.2
)
 
3.7

 
(333.8
)
 
 
Net income for the year
16.1

 
—

 
—

 
—

 
—

 
 
Currency translation differences
—

 
—

 
(8.6
)
 
—

 
—

 
 
Decrease in fair value of cash flow hedges
—

 
(5.4
)
 
—

 
—

 
—

 
 
Transfer to consolidated income statement on cash flow hedges
—

 
(0.1
)
 
—

 
—

 
—

 
 
Remeasurement of defined benefit retirement plans
4.4

 
—

 
—

 
—

 
—

 
 
Deferred income taxes on items taken to other comprehensive income
(1.5
)
 
1.1

 
—

 
—

 
—

 
 
Equity dividends
(10.8
)
 
—

 
—

 
—

 
—

 
 
Equity settled share based compensation charges
—

 
—

 
—

 
1.4

 
—

 
 
Cash settled share based compensation charges
—

 
—

 
—

 
(0.5
)
 
—

 
 
Deferred income taxes on items taken to equity
(0.3
)
 
—

 
—

 
—

 
—

 
 
Utilization of treasury shares
(0.1
)
 
—

 
—

 
(0.5
)
 
—

 
 
At December 31, 2015
316.6

 
(3.5
)
 
(44.8
)
 
4.1

 
(333.8
)
 
 
Net income for the year
21.9

 
—

 
—

 
—

 
—

 
 
Currency translation differences
—

 
—

 
(13.1
)
 
—

 
—

 
 
Increase in fair value of cash flow hedges
—

 
1.1

 
—

 
—

 
—

 
 
Transfer to consolidated income statement on cash flow hedges
—

 
(0.9
)
 
—

 
—

 
—

 
 
Remeasurement of defined benefit retirement plans
(21.7
)
 
—

 
—

 
—

 
—

 
 
Deferred income taxes on items taken to other comprehensive income
4.3

 
—

 
—

 
—

 
—

 
 
Equity dividends
(13.3
)
 
—

 
—

 
—

 
—

 
 
Equity settled share based compensation charges
—

 
—

 
—

 
1.2

 
—

 
 
Utilization of treasury shares
0.1

 
—

 
—

 
(0.6
)
 
—

 
 
Utilization of ESOP shares
0.2

 
—

 
—

 
(0.9
)
 
—

 
 
At December 31, 2016
308.1

 
(3.3
)
 
(57.9
)
 
3.8

 
(333.8
)
 
 
Net income for the year
11.5

 
—

 
—

 
—

 
—

 
 
Currency translation differences
—

 
—

 
11.6

 
—

 
—

 
 
Increase in fair value of cash flow hedges
—

 
3.1

 
—

 
—

 
—

 
 
Transfer to consolidated income statement on cash flow hedges
—

 
0.6

 
—

 
—

 
—

 
 
Remeasurement of defined benefit retirement plans
9.5

 
—

 
—

 
—

 
—

 
 
Deferred income taxes on items taken to other comprehensive income
(5.2
)
 
(0.6
)
 
—

 
—

 
—

 
 
Equity dividends
(13.3
)
 
—

 
—

 
—

 
—

 
 
Equity settled share based compensation charges
—

 
—

 
—

 
2.6

 
—

 
 
Utilization of treasury shares
0.1

 
—

 
—

 
(0.6
)
 
—

 
 
Utilization of ESOP shares
0.1

 
—

 
—

 
(0.4
)
 
—

 
 
Deferred income taxes on items taken to equity
0.6

 
—

 
—

 
—

 
—

 
 
At December 31, 2017
311.4

 
(0.2
)
 
(46.3
)
 
5.4

 
(333.8
)