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Income Taxes - Domestic and Foreign Income Tax Components (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ (36.5) $ (227.4) $ (234.9)
Foreign 766.3 882.4 843.3
Total $ 729.8 $ 655.0 $ 608.4