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Debt - Schedule of Maturities of Company's Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 $ 7.2  
2020 0.0  
2021 25.0  
2022 28.2  
2023 25.0  
2024 0.0  
Thereafter 25.0  
Total 110.4  
Other    
Debt Instrument [Line Items]    
2019 7.2  
2020 0.0  
2021 0.0  
2022 0.0  
2023 0.0  
2024 0.0  
Thereafter 0.0  
Total 7.2 $ 3.5
Loan Notes | Loan Notes due 2021    
Debt Instrument [Line Items]    
2019 0.0  
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]    
2019 0.0  
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]    
2019 0.0  
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]    
2019 0.0  
2020 0.0  
2021 0.0  
2022 28.2  
2023 0.0  
2024 0.0  
Thereafter 0.0  
Total $ 28.2 $ 0.0