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Common Equity - Share Repurchase Program (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stockholders' Equity Note [Abstract]      
New shares of common stock issued 0.0 0.0 0.0
Shares purchased 0.2 0.7 0.4
Cost of shares purchased $ 16.6 $ 69.2 $ 33.1