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Earnings per share (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
£ / shares
Dec. 31, 2016
£ / shares
Dec. 31, 2015
£ / shares
Earnings per share [abstract]            
Par value per share (in GBP per share) | £ / shares       £ 0.50 £ 0.5 £ 0.5
Basic earnings:            
Net income $ 11.5 $ 21.9 $ 16.1      
Accounting charges relating to acquisitions and disposals of businesses            
Unwind of discount on deferred contingent consideration from acquisitions 0.2 0.4 0.4      
Acquisitions and disposals (Note 5) (1.3) (0.2) 2.0      
Amortization on acquired intangibles 1.2 1.0 1.4      
IAS 19R retirement benefits finance charge 1.8 2.1 3.0      
Profit on sale of redundant site (Note 5) (0.4) (2.1) 0.0      
Changes to defined benefit pension plans (Note 5) 0.0 (0.6) (18.0)      
Restructuring and other expense (Note 5) 21.6 2.2 22.4      
Other share based compensation charges 2.2 1.4 1.3      
Impact from U.S. tax reform (6.0) 0.0 0.0      
Income tax thereon (3.2) (1.4) 0.9      
Adjusted net income $ 27.6 $ 24.7 $ 29.5      
Weighted average number of £0.50 ordinary shares:            
For basic earnings per share (in shares) | shares 26,460,947 26,443,662 26,918,987      
Exercise of share options (in shares) | shares 541,223 270,997 453,736      
For diluted earnings per share (in shares) | shares 27,002,170 26,714,659 27,372,723      
Basic            
Adjusted (in USD per share) | $ / shares $ 1.04 $ 0.93 $ 1.10      
Unadjusted (in USD per share) | $ / shares 0.43 0.83 0.60      
Diluted            
Adjusted (in USD per share) | $ / shares 1.02 0.92 1.08      
Unadjusted (in USD per share) | $ / shares $ 0.43 $ 0.82 $ 0.59