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Financial risk management objectives and policies - Maturity Profile of Financial Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Jun. 29, 2016
Dec. 31, 2015
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans $ 108.8 $ 121.0   $ 131.6
Deferred contingent consideration 0.7 1.5    
Deferred consideration 0.3 1.3    
Trade payables 28.4 24.0    
Accruals 31.2 20.4    
Interest payable 0.4 0.2    
Derivative financial instruments 1.9 5.8    
Overdrafts 4.2 0.0   $ 0.0
Financial liabilities book value 178.4 176.0    
Loan Notes due 2018        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 15.0 14.9    
Loan Notes due 2021        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 24.9 24.9    
Loan Notes due 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 24.7 24.7    
Loan Notes due 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 24.7 24.7    
Revolving credit facility        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 19.5 31.8    
Within 12 months        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Deferred contingent consideration 0.5 0.0    
Deferred consideration 0.3 1.3    
Trade payables 28.4 24.0    
Accruals 29.7 20.4    
Interest payable 0.4 0.2    
Derivative financial instruments 1.5 5.2    
Overdrafts 4.2 0.0    
Financial liabilities book value 80.0 51.1    
1-5 years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Deferred contingent consideration 0.2 1.5    
Deferred consideration 0.0 0.0    
Trade payables 0.0 0.0    
Accruals 1.5 0.0    
Interest payable 0.0 0.0    
Derivative financial instruments 0.4 0.6    
Overdrafts 0.0 0.0    
Financial liabilities book value 48.4 74.9    
In over five years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Deferred contingent consideration 0.0 0.0    
Deferred consideration 0.0 0.0    
Trade payables 0.0 0.0    
Accruals 0.0 0.0    
Interest payable 0.0 0.0    
Derivative financial instruments 0.0 0.0    
Overdrafts 0.0 0.0    
Financial liabilities book value 50.0 50.0    
Gross carrying amount | Loan Notes due 2018        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 15.0 15.0 $ 50.0  
Gross carrying amount | Loan Notes due 2021        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | Loan Notes due 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | Loan Notes due 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | Revolving credit facility        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 21.3 32.8    
Gross carrying amount | Within 12 months | Loan Notes due 2018        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 15.0 0.0    
Gross carrying amount | Within 12 months | Loan Notes due 2021        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | Within 12 months | Loan Notes due 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | Within 12 months | Loan Notes due 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | Within 12 months | Revolving credit facility        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | 1-5 years | Loan Notes due 2018        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 15.0    
Gross carrying amount | 1-5 years | Loan Notes due 2021        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | 1-5 years | Loan Notes due 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | 1-5 years | Loan Notes due 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | 1-5 years | Revolving credit facility        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 21.3 32.8    
Gross carrying amount | In over five years | Loan Notes due 2018        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | In over five years | Loan Notes due 2021        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 0.0 0.0    
Gross carrying amount | In over five years | Loan Notes due 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | In over five years | Loan Notes due 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | In over five years | Revolving credit facility        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Bank and other loans $ 0.0 $ 0.0