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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator        
Net Income Available to Common Shareholders - Basic $ 53.2 $ 46.5 $ 466.2 $ 328.2
Dilutive effect of Equity Units 0.5 0.4 1.0 0.4
Net Income Available to Common Shareholders - Diluted $ 53.7 $ 46.9 $ 467.2 $ 328.6
Denominator        
Basic Average Common Shares Outstanding 406.4 393.0 406.2 392.8
Dilutive potential common shares        
Equity Units purchase contracts 27.9 28.2 28.5 14.2
Equity Units purchase contract payment balance 3.3 0.0 3.6 0.0
Shares contingently issuable under employee stock plans 1.0 0.8 1.0 0.7
Shares restricted under stock plans 0.4 0.3 0.4 0.3
ATM forward agreements 1.2 0.6 1.1 0.5
Diluted Average Common Shares 440.2 422.9 440.8 408.5