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Income Taxes - Significant Components of Income Before Income Taxes as Used for Income Tax Purposes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of income before income taxes as used for income tax purposes      
Domestic $ 1,899.6 $ 1,309.3 $ 1,415.6
Foreign 82.2 50.4 53.7
Income before income taxes $ 1,981.8 $ 1,359.7 $ 1,469.3