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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Numerator |  |  |  |
Net Income Available to Common Shareholders | $ 85.8 | $ 39.9 | $ 430.1 | $ 359.1
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic | 0.4 | 0.0 | 0.7 | 0.2
Net Income Available to Common Shareholders - Basic Excluding Participating Securities | 85.4 | 39.9 | 429.4 | 358.9
Add: Dilutive effect of Equity Units | 0.0 | 0.4 | 0.0 | 0.8
Net Income Available to Common Shareholders - Diluted | $ 85.4 | $ 40.3 | $ 429.4 | $ 359.7
Denominator |  |  |  |
Basic Average Common Shares Outstanding | 448.5 | 413.3 | 448.2 | 413.1
Dilutive potential common shares |  |  |  |
Equity Units purchase contracts | 0.0 | 31.3 |  | 31.2
Equity Units purchase contract payment balance | 0.0 | 1.2 | 0.0 | 1.5
Shares contingently issuable under employee stock plans | 0.7 | 0.6 | 0.8 | 0.7
Shares restricted under stock plans | 0.3 | 0.4 | 0.3 | 0.4
ATM forward agreements | 0.7 | 0.0 | 0.5 | 0.0
Diluted Average Common Shares | 450.2 | 446.8 | 449.8 | 446.9
Basic Earnings Per Share | $ 0.19 | $ 0.10 | $ 0.96 | $ 0.87
Diluted Earnings Per Share | $ 0.19 | $ 0.09 | $ 0.95 | $ 0.80

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