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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator
Net Income Available to Common Shareholders	$ 94.7	$ 85.7	$ 671.7	$ 515.8
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0.3	0.2	1.4	0.9
Net Income Available to Common Shareholders - Basic Excluding Participating Securities	94.4	85.5	670.3	514.9
Net Income Available to Common Shareholders - Diluted	$ 94.4	$ 85.5	$ 670.3	$ 514.9
Denominator
Basic Average Common Shares Outstanding	472.1	451.9	471.1	449.4
Dilutive potential common shares
Shares contingently issuable under employee stock plans	1.0	0.9	1.1	0.9
Shares restricted under stock plans	0.4	0.3	0.5	0.3
ATM forward sale agreements	0.2	1.4	0.1	0.8
Diluted Average Common Shares	473.7	454.5	472.8	451.4
Basic Earnings Per Share	$ 0.20	$ 0.19	$ 1.42	$ 1.15
Diluted Earnings Per Share	$ 0.20	$ 0.19	$ 1.42	$ 1.14

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