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Income Taxes - Schedule of Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Beginning balance $ 16.5 $ 18.0
Foreign exchange movements 0.7 (2.2)
(Deductions) / additions (0.2) 0.7
Closing balance $ 17.0 $ 16.5