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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]      
Income before income taxes, Domestic $ 279.9 $ 557.4 $ 474.0
Income before income taxes, Foreign 81.4 320.9 364.0
Income before income taxes $ 361.3 $ 878.3 $ 838.0