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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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Income $ 241.9 $ 88.4 $ 38.3 $ 262.8 $ 73.1 $ 279.5 $ 368.6 $ 615.4
Basic average common shares outstanding 200.3     200.2     200.3 200.2
Contingently issuable shares (performance and restricted stock units) 0.7     0.7     0.6 0.5
Diluted average common shares outstanding 201.0     200.9     200.9 200.7
Basic earnings per average common share $ 1.21     $ 1.31     $ 1.84 $ 3.07
Diluted earnings per average common share $ 1.2     $ 1.31     $ 1.83 $ 3.07
Anti-dilutive shares excluded from earnings per share calculation 0.0     0.0     0.0 0.0
Retained Earnings [Member]                
Net Income $ 241.9 $ 88.4 $ 38.3 $ 262.8 $ 73.1 $ 279.5 $ 368.6 $ 615.4