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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net Income Available to Common Shareholders $ 739.7 $ 661.7 $ 749.0
Add: Dilutive effect of Equity Units 0.0 1.4 2.0
Net Income Available to Common Shareholders - Diluted $ 738.1 $ 662.5 $ 751.0
Average common shares outstanding - Basic 454,200 416,100 407,100
Equity Units purchase contracts 0 29,800 30,200
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements 0 900 3,200
Shares contingently issuable under employee stock plans 900 700 900
Shares restricted under employee stock plans 300 400 500
ATM Forward agreements 600 0 800
Average Common Shares - Diluted 456,000 447,900 442,700
Basic Earnings Per Share $ 1.63 $ 1.59 $ 1.84
Diluted Earnings Per Share $ 1.62 $ 1.48 $ 1.70
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic $ 1.6 $ 0.6 $ 0.0
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic $ 738.1 $ 661.1 $ 749.0