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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net Income Available to Common Shareholders $ 661.7 $ 749.0 $ 529.8
Add: Dilutive effect of Equity Units 1.4 2.0 1.6
Net Income Available to Common Shareholders - Diluted $ 662.5 $ 751.0 $ 531.4
Average common shares outstanding - Basic 416,100 407,100 393,600
Equity Units purchase contracts 29,800 30,200 22,000
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements 900 3,200 0
Shares contingently issuable under employee stock plans 700 900 800
Shares restricted under employee stock plans 400 500 300
ATM Forward agreements 0 800 600
Average Common Shares - Diluted 447,900 442,700 417,300
Basic Earnings Per Share $ 1.59 $ 1.84 $ 1.35
Diluted Earnings Per Share $ 1.48 $ 1.70 $ 1.27
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic $ 0.6 $ 0.0 $ 0.0
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic $ 661.1 $ 749.0 $ 529.8