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Debt - Schedule of Maturities of Company's Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2020 $ 0.0  
2021 25.0  
2022 17.5  
2023 25.0  
2024 0.0  
Thereafter 25.0  
Total 92.5  
Loan Notes | Loan Notes due 2021    
Debt Instrument [Line Items]    
2020 0.0  
2021 25.0  
2022 0.0  
2023 0.0  
2024 0.0  
Thereafter 0.0  
Total 25.0 $ 25.0
Loan Notes | Loan Notes due 2023    
Debt Instrument [Line Items]    
2020 0.0  
2021 0.0  
2022 0.0  
2023 25.0  
2024 0.0  
Thereafter 0.0  
Total 25.0 25.0
Loan Notes | Loan Notes due 2026    
Debt Instrument [Line Items]    
2020 0.0  
2021 0.0  
2022 0.0  
2023 0.0  
2024 0.0  
Thereafter 25.0  
Total 25.0 25.0
Revolving credit facility    
Debt Instrument [Line Items]    
2020 0.0  
2021 0.0  
2022 17.5  
2023 0.0  
2024 0.0  
Thereafter 0.0  
Total $ 17.5 $ 0.0