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Debt - Schedule of Debt Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, gross $ 110.4  
Unamortized debt issuance costs (1.2) $ (1.4)
Total debt 109.2 77.1
Less current portion (7.2) (3.5)
Non-current debt 102.0 73.6
Other - Bank overdraft    
Debt Instrument [Line Items]    
Long-term debt, gross 7.2 3.5
Loan Notes | Loan Notes due 2021    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25.0 25.0
Debt stated interest rate 3.67%  
Loan Notes | Loan Notes due 2023    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25.0 25.0
Debt stated interest rate 4.88%  
Loan Notes | Loan Notes due 2026    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25.0 25.0
Debt stated interest rate 4.94%  
Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt, gross $ 28.2 $ 0.0