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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, 2023
Mar. 31, 2022
Numerator    
Net Income Available to Common Shareholders $ 319.2 $ 413.0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 0.2 0.0
Net Income Available to Common Shareholders - Basic Excluding Participating Securities 319.0 413.0
Add: Dilutive effect of Equity Units 0.4 0.5
Net Income Available to Common Shareholders - Diluted $ 319.4 $ 413.5
Denominator    
Basic Average Common Shares Outstanding 412.8 406.0
Dilutive potential common shares    
Equity Units purchase contracts 31.2 29.1
Equity Units purchase contract payment balance 1.8 4.0
Shares contingently issuable under employee stock plans 0.8 1.0
Shares restricted under stock plans 0.5 0.4
ATM forward agreements 0.0 0.9
Diluted Average Common Shares 447.1 441.4