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Stock-Based Compensation (Schedule of Stock-based Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]      
Stock-based compensation expense $ 342.8 $ 308.1 $ 306.8
Tax benefit $ 72.0 $ 64.7 $ 64.4