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Stock-Based Payments (Compensation Expense And Income Tax Benefit Recognized) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 76.4 $ 96.9 $ 85.8
Income tax benefit recognized $ 20.6 $ 23.6 $ 27.3