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Income Taxes - Schedule of Income before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
U.K. $ 10.9 $ 21.8 $ 21.0
International 30.1 13.6 6.7
Income before income taxes $ 41.0 $ 35.4 $ 27.7