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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, 2024
Mar. 31, 2023
Net Income $ 18.6 $ 38.3
Basic average common shares outstanding 200.4 200.2
Contingently issuable shares (performance and restricted stock units) 0.2 0.6
Diluted average common shares outstanding 200.6 200.8
Basic earnings per average common share $ 0.09 $ 0.19
Diluted earnings per average common share $ 0.09 $ 0.19
Anti-dilutive shares excluded from earnings per share calculation 0.0 0.0
Retained Earnings [Member]    
Net Income $ 18.6 $ 38.3