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Debt - Schedule of Debt Outstanding (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, gross $ 93.9  
Unamortized debt issuance costs (1.3) $ (1.4)
Total debt 92.6 77.1
Less current portion (7.6) (3.5)
Long-term debt 85.0 73.6
Other - Bank overdraft    
Debt Instrument [Line Items]    
Long-term debt, gross 7.6 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 $ 11.3 $ 0.0