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Debt - Schedule of Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2017
Debt Instrument [Line Items]      
Long-term debt, gross $ 78.5    
Unamortized debt issuance costs (1.4) $ (1.7)  
Total debt 77.1 113.8  
Less current portion (3.5) (19.2)  
Long-term debt 73.6 94.6  
Other - Bank overdraft      
Debt Instrument [Line Items]      
Long-term debt, gross 3.5 4.2  
Loan Notes | Loan Notes due 2018      
Debt Instrument [Line Items]      
Long-term debt, gross $ 0.0 15.0  
Debt stated interest rate 6.19%    
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 $ 0.0 $ 21.3  
Unamortized debt issuance costs     $ (1.0)