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Reserves - Movement in Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reserves within equity [line items]                              
Beginning balance       $ 141.9       $ 169.7       $ 175.4 $ 141.9 $ 169.7 $ 175.4
Net income for the year                         11.5 21.9 16.1
Currency translation differences                         11.6 (13.1) (8.6)
Increase in fair value of cash flow hedges                           1.1 (5.4)
Remeasurement of defined benefit retirement plans                         (9.5) 21.7  
Deferred income taxes on items taken to other comprehensive income                         (5.8) 4.3 (0.4)
Equity dividends $ (3.4) $ (3.3) $ (3.3) (3.3) $ (3.3) $ (3.3) $ (3.3) (3.4) $ (2.7) $ (2.7) $ (2.7) (2.7) (13.3) (13.3) (10.8)
Equity settled share based compensation charges                         2.6 1.2 0.9
Deferred income taxes on items taken to equity                         0.6   (0.3)
Ending balance 162.3       141.9       169.7       162.3 141.9 169.7
Hedging reserve                              
Disclosure of reserves within equity [line items]                              
Beginning balance       (3.3)       (3.5)       0.9 (3.3) (3.5) 0.9
Increase in fair value of cash flow hedges                         3.1 (1.1) (5.4)
Transfer to consolidated income statement on cash flow hedges                         0.6 (0.9) (0.1)
Deferred income taxes on items taken to other comprehensive income                         (0.6)   1.1
Ending balance (0.2)       (3.3)       (3.5)       (0.2) (3.3) (3.5)
Translation reserve                              
Disclosure of reserves within equity [line items]                              
Beginning balance       (57.9)       (44.8)       (36.2) (57.9) (44.8) (36.2)
Currency translation differences                         11.6 (13.1) (8.6)
Ending balance (46.3)       (57.9)       (44.8)       (46.3) (57.9) (44.8)
Share based compensation reserve                              
Disclosure of reserves within equity [line items]                              
Beginning balance       3.8       4.1       3.7 3.8 4.1 3.7
Equity settled share based compensation charges                         2.6 1.2 1.4
Cash settled share based compensation charges                             (0.5)
Utilization of treasury shares                         (0.6) (0.6) (0.5)
Utilization of ESOP shares                         (0.4) (0.9)  
Ending balance 5.4       3.8       4.1       5.4 3.8 4.1
Merger reserve                              
Disclosure of reserves within equity [line items]                              
Beginning balance       (333.8)       (333.8)       (333.8) (333.8) (333.8) (333.8)
Ending balance (333.8)       (333.8)       (333.8)       (333.8) (333.8) (333.8)
Retained earnings                              
Disclosure of reserves within equity [line items]                              
Beginning balance       $ 308.1       $ 316.6       $ 308.8 308.1 316.6 308.8
Net income for the year                         11.5 21.9 16.1
Remeasurement of defined benefit retirement plans                         9.5 (21.7) 4.4
Deferred income taxes on items taken to other comprehensive income                         (5.2) 4.3 (1.5)
Equity dividends                         (13.3) (13.3) (10.8)
Deferred income taxes on items taken to equity                         0.6   (0.3)
Utilization of treasury shares                         0.1 0.1 (0.1)
Utilization of ESOP shares                         0.1 0.2  
Ending balance $ 311.4       $ 308.1       $ 316.6       $ 311.4 $ 308.1 $ 316.6