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Debt - Schedule of Debt Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 54.1
Unamortized debt issuance costs	(0.7)	$ (1.1)
Total debt	53.4	91.4
Long-term debt	53.4	91.4
Loan Notes \| Loan Notes due 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 0.0	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	$ 4.1	$ 17.5
Unamortized debt issuance costs			$ (1.0)