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Staff Costs - Components of Staff Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]      
Wages and salaries $ 96.1 $ 92.2 $ 96.3
Social security costs 11.0 10.5 11.2
Post-retirement benefits (2.6) (2.7) 12.4
Retirement benefits costs 4.8 4.8 5.9
IAS 19R retirement benefits finance charge 1.8 2.1 3.0
Redundancy costs: Continuing activities 4.5 0.7 1.5
Share based compensation charges (Note 31) 3.1 1.4 1.4
Staff costs 121.3 111.7 119.3
Board of Directors      
Disclosure of transactions between related parties [line items]      
Remuneration (short-term benefits) 2.0 1.5 1.7
Social security costs 0.3 0.2 0.2
Post-retirement benefits 0.2 0.1 0.2
Compensation for loss of office 0.3 0.0 0.0
Staff costs $ 2.8 $ 1.8 $ 2.1