Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator
Net Income Available to Common Shareholders	$ 344.3	$ 319.2
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0.3	0.2
Net Income Available to Common Shareholders - Basic Excluding Participating Securities	344.0	319.0
Add: Dilutive effect of Equity Units	0.0	0.4
Net Income Available to Common Shareholders - Diluted	$ 344.0	$ 319.4
Denominator
Basic Average Common Shares Outstanding	447.9	412.8
Dilutive potential common shares
Equity Units purchase contracts		31.2
Equity Units purchase contract payment balance	0.0	1.8
Shares contingently issuable under employee stock plans	0.9	0.8
Shares restricted under stock plans	0.4	0.5
ATM forward agreement	0.2	0.0
Diluted Average Common Shares	449.4	447.1
Basic Earnings Per Share	$ 0.77	$ 0.77
Diluted Earnings Per Share	$ 0.77	$ 0.71