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Debt - Schedule of Debt Outstanding (Details) - USD ($)
$ in Millions
Jun. 28, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, gross $ 91.3  
Unamortized debt issuance costs (0.8) $ (1.1)
Total debt 90.5 91.4
Less current portion 0.0 0.0
Non-current debt 90.5 91.4
Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt, gross 16.3 17.5
Loan Notes | 3.67% Loan Notes due 2021    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25.0 25.0
Debt stated interest rate 3.67%  
Loan Notes | 4.88% Loan Notes due 2023    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25.0 25.0
Debt stated interest rate 4.88%  
Loan Notes | 4.94% Loan Notes due 2026    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25.0 $ 25.0
Debt stated interest rate 4.94%