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Financial instruments - Interest Rate Risk Profiles (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value $ 178.4 $ 176.0
Financial liabilities, including interest payments 136.0 150.8
Within 12 months    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 80.0 51.1
Financial liabilities, including interest payments 19.5 5.2
1-5 years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 48.4 74.9
Financial liabilities, including interest payments 61.6 88.2
In over five years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 50.0 50.0
Financial liabilities, including interest payments 54.9 57.4
Revolving credit facility    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 21.3 32.8
Loan Notes due 2018    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 15.0 15.0
Loan Notes due 2021    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 25.0 25.0
Loan Notes due 2023    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 25.0 25.0
Loan Notes due 2026    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 25.0 25.0
Overdrafts    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 4.2 0.0
Floating interest rate | Revolving credit facility    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 24.9 35.0
Floating interest rate | Revolving credit facility | Within 12 months    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 0.7 0.9
Floating interest rate | Revolving credit facility | 1-5 years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 24.2 34.1
Floating interest rate | Revolving credit facility | In over five years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 0.0 0.0
Floating interest rate | Overdrafts    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 4.2 0.0
Floating interest rate | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 13.3 13.6
Floating interest rate | U.S. dollar | Overdrafts    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 3.0 0.0
Floating interest rate | U.S. dollar | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 5.4 1.3
Floating interest rate | GBP sterling | Overdrafts    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities book value 1.2 0.0
Floating interest rate | GBP sterling | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 3.6 9.1
Floating interest rate | Euro | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 1.0 1.4
Floating interest rate | Australian dollar | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 0.6 0.5
Floating interest rate | Chinese renminbi | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 1.0 0.8
Floating interest rate | Czech koruna | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 1.2 0.3
Floating interest rate | Canadian dollar | Cash and cash equivalents    
Disclosure of financial instruments by type of interest rate [line items]    
Financial assets book value 0.5 0.2
Fixed interest rate | Loan Notes due 2018    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 15.5 16.4
Fixed interest rate | Loan Notes due 2018 | Within 12 months    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 15.5 0.9
Fixed interest rate | Loan Notes due 2018 | 1-5 years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 0.0 15.5
Fixed interest rate | Loan Notes due 2018 | In over five years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 0.0 0.0
Fixed interest rate | Loan Notes due 2021    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 28.4 29.7
Fixed interest rate | Loan Notes due 2021 | Within 12 months    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 0.9 1.0
Fixed interest rate | Loan Notes due 2021 | 1-5 years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 27.5 28.7
Fixed interest rate | Loan Notes due 2021 | In over five years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 0.0 0.0
Fixed interest rate | Loan Notes due 2023    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 31.7 32.9
Fixed interest rate | Loan Notes due 2023 | Within 12 months    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 1.2 1.2
Fixed interest rate | Loan Notes due 2023 | 1-5 years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 4.9 4.9
Fixed interest rate | Loan Notes due 2023 | In over five years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 25.6 26.8
Fixed interest rate | Loan Notes due 2026    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 35.5 36.8
Fixed interest rate | Loan Notes due 2026 | Within 12 months    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 1.2 1.2
Fixed interest rate | Loan Notes due 2026 | 1-5 years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments 5.0 5.0
Fixed interest rate | Loan Notes due 2026 | In over five years    
Disclosure of financial instruments by type of interest rate [line items]    
Financial liabilities, including interest payments $ 29.3 $ 30.6