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Common Equity - Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net Income $ 62.7 $ 18.6
Basic average common shares outstanding 201.2 200.4
Contingently issuable shares (performance and restricted stock units) 0.7 0.2
Diluted average common shares outstanding 201.9 200.6
Basic earnings per average common share $ 0.31 $ 0.09
Diluted earnings per average common share $ 0.31 $ 0.09
Anti-dilutive shares excluded from earnings per share calculation 0.0 0.0
Retained Earnings [Member]    
Net Income $ 62.7 $ 18.6