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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator        
Net Income Available to Common Shareholders $ 39.9 $ 53.2 $ 359.1 $ 466.2
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic     0.0 0.0
Net Income Available to Common Shareholders - Basic Excluding Participating Securities     39.9 53.2
Add: Dilutive effect of Equity Units   0.5 0.8 1.0
Net Income Available to Common Shareholders - Diluted $ 40.3 $ 53.7 $ 359.7 $ 467.2
Denominator        
Basic Average Common Shares Outstanding 413.3 406.4 413.1 406.2
Dilutive potential common shares        
Equity Units purchase contracts 31.3 27.9 31.2 28.5
Equity Units purchase contract payment balance 1.2 3.3 1.5 3.6
Shares contingently issuable under employee stock plans 0.6 1.0 0.7 1.0
Shares restricted under stock plans 0.4 0.4 0.4 0.4
ATM forward agreements 0.0 1.2 0.0 1.1
Diluted Average Common Shares 446.8 440.2 446.9 440.8