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Bank and other loans - Schedule of bank and other loans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Jun. 29, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]        
Bank and other loans $ 108.8 $ 121.0   $ 131.6
Included in current liabilities 15.0 0.0    
Included in non-current liabilities 93.8 121.0    
Loan Notes due 2018        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 15.0 14.9    
Loan Notes due 2021        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 24.9 24.9    
Loan Notes due 2023        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 24.7 24.7    
Loan Notes due 2026        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 24.7 24.7    
Revolving credit facility        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 19.5 31.8    
Gross carrying amount | Loan Notes due 2018        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 15.0 15.0 $ 50.0  
Gross carrying amount | Loan Notes due 2021        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | Loan Notes due 2023        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | Loan Notes due 2026        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 25.0 25.0    
Gross carrying amount | Revolving credit facility        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 21.3 32.8    
Unamortized finance costs | Loan Notes due 2018        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans 0.0 (0.1)    
Unamortized finance costs | Loan Notes due 2021        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans (0.1) (0.1)    
Unamortized finance costs | Loan Notes due 2023        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans (0.3) (0.3)    
Unamortized finance costs | Loan Notes due 2026        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans (0.3) (0.3)    
Unamortized finance costs | Revolving credit facility        
Disclosure of detailed information about borrowings [line items]        
Bank and other loans $ (1.8) $ (1.0)