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Income Taxes - Schedule of Income before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
U.K. $ 21.8 $ 21.0 $ 13.4
International 13.6 6.7 2.9
Income before income taxes $ 35.4 $ 27.7 $ 16.3