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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Numerator    
Net Income Available to Common Shareholders - Basic $ 413.0 $ 281.7
Dilutive effect of Equity Units 0.5 0.0
Net Income Available to Common Shareholders - Diluted $ 413.5 $ 281.7
Denominator    
Basic Average Common Shares Outstanding 406.0 392.7
Dilutive potential common shares    
Equity Units purchase contracts 29.1 0.0
Equity Units purchase contract payment balance 4.0 0.0
Shares contingently issuable under employee stock plans 1.0 0.6
Shares restricted under stock plans 0.4 0.3
ATM forward agreements 0.9 0.3
Diluted Average Common Shares 441.4 393.9