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Income Taxes - Income/(Loss) before Income Taxes by Geographic Area (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ 366.6 $ 227.9 $ 192.1
Foreign 3.7 (0.6) 13.3
INCOME (LOSS) BEFORE INCOME TAXES $ 370.3 $ 227.3 $ 205.4