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Income Taxes - Earnings Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ 902.4 $ 1,902.2 $ 924.2
Other 306.9 325.2 274.2
Earnings before income taxes $ 1,209.3 $ 2,227.4 $ 1,198.4