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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
--- | ---
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

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482689/260-10-45-10 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration