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Income Taxes - Components 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]      
Domestic $ 446.1 $ 152.2 $ 637.3
International 62.2 155.8 76.3
Total $ 508.3 $ 308.0 $ 713.6