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Debt - Schedule of Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2017
Debt Instrument [Line Items]      
Long-term debt, gross $ 92.5    
Unamortized debt issuance costs (1.1) $ (1.4)  
Total debt 91.4 77.1  
Less current portion 0.0 (3.5)  
Long-term debt 91.4 73.6  
Other - Bank overdraft      
Debt Instrument [Line Items]      
Long-term debt, gross 0.0 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 $ 17.5 $ 0.0  
Unamortized debt issuance costs     $ (1.0)