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Financial instruments - Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]    
Book value $ 178.4 $ 176.0
Loan Notes due 2018    
Disclosure of financial liabilities [line items]    
Book value 15.0 15.0
Fair value 15.3 15.9
Loan Notes due 2021    
Disclosure of financial liabilities [line items]    
Book value 25.0 25.0
Fair value 25.2 25.0
Loan Notes due 2023    
Disclosure of financial liabilities [line items]    
Book value 25.0 25.0
Fair value 26.6 26.3
Loan Notes due 2026    
Disclosure of financial liabilities [line items]    
Book value 25.0 25.0
Fair value 27.1 26.5
Revolving credit facility    
Disclosure of financial liabilities [line items]    
Book value 21.3 32.8
Fair value 21.3 32.8
Overdrafts    
Disclosure of financial liabilities [line items]    
Book value 4.2 0.0
Fair value 4.2 0.0
Deferred contingent consideration    
Disclosure of financial liabilities [line items]    
Book value 0.7 1.5
Fair value 0.7 1.5
Deferred consideration    
Disclosure of financial liabilities [line items]    
Book value 0.3 1.3
Fair value 0.3 1.3
Cash at bank and in hand    
Disclosure of financial assets [line items]    
Book value 13.3 13.6
Fair value $ 13.3 $ 13.6