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Derivatives and Financial Instruments - Fair Values of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contract liabilities $ 0.4 $ 0.1
Foreign currency contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contract assets 0.2  
Foreign currency contract liabilities 0.4  
Foreign currency contract | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contract assets 0.0  
Foreign currency contract liabilities 0.0  
Foreign currency contract | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contract assets 0.2  
Foreign currency contract liabilities 0.4  
Foreign currency contract | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contract assets 0.0  
Foreign currency contract liabilities 0.0  
Loan Notes | Loan Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 25.0  
Loan Notes | Loan Notes due 2026    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 25.0  
Loan Notes | Level 1 | Loan Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 0.0  
Loan Notes | Level 1 | Loan Notes due 2026    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 0.0  
Loan Notes | Level 2 | Loan Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 25.0  
Loan Notes | Level 2 | Loan Notes due 2026    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 25.0  
Loan Notes | Level 3 | Loan Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 0.0  
Loan Notes | Level 3 | Loan Notes due 2026    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 0.0  
Revolving credit facility    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 4.1  
Revolving credit facility | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 0.0  
Revolving credit facility | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: 4.1  
Revolving credit facility | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest bearing loans and borrowings: $ 0.0