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Income Tax Matters - (Loss) Income Before Income Taxes by Geographic Area (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Domestic $ (30.2) $ 35.2 $ 76.3
Foreign 6.2 3.6 4.1
(Loss) income before income taxes $ (24.0) $ 38.8 $ 80.4