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Common Equity - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Basic earnings per common share                
Net income available to common shareholders $ 30.6 $ 35.3 $ 18.5 $ 35.6 $ 77.5 $ 98.0 $ 84.4 $ 211.1
Weighted average common shares outstanding 175.2     176.9     175.6 177.7
Diluted earnings per common share                
Dilutive effect of share-based awards and options outstanding 0.7     0.9     0.5 0.8
Weighted average diluted shares outstanding 175.9     177.7     176.1 178.5
Basic earnings per share $ 0.17     $ 0.20     $ 0.48 $ 1.19
Diluted earnings per share $ 0.17     $ 0.20     $ 0.48 $ 1.18