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Income Taxes - Schedule of Income before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.K. $ 21.0 $ 13.4 $ 26.5
International 6.7 2.9 7.7
Income before income taxes $ 27.7 $ 16.3 $ 34.2