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Share-Based Compensation Plans (Compensation Expense for Share-Based Arrangements and Tax Impacts) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 50.5 $ 53.8
Tax Benefits Recognized $ 12.7 $ 13.4
Restricted Stock Unit Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares) 729,013 763,554
Share-based compensation arrangement by share-based payment award, equity instruments other than options, granted in period, fair value $ 70.4 $ 76.2
Share-based compensation expense 38.4 40.7
Employee benefits and share-based compensation 4.2 4.3
Restricted Stock Unit Awards | Retirement Eligible Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 21.8 $ 23.2
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares) 0 0
Share-based compensation expense $ 0.0 $ 0.2
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares) 200,066 205,847
Share-based compensation arrangement by share-based payment award, equity instruments other than options, granted in period, fair value $ 19.5 $ 20.8
Share-based compensation expense 12.1 12.9
Performance Stock Units | Retirement Eligible Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 9.9 $ 10.8