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CONSOLIDATED STATEMENTS OF CHANGES IN COMMON STOCK EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Common Equity
Retained Earnings
Beginning Balance at Dec. 31, 2023   $ 337.6 $ 151.5
Beginning Balance at Dec. 31, 2023 $ 489.1    
Net Income 31.5   31.5
Dividends on Common Shares (20.6)   (20.6)
Stock Compensation Plans 1.5 1.5  
Issuance of Common Shares 0.7 0.7  
Ending Balance at Sep. 30, 2024 502.4 339.8 162.4
Ending Balance at Sep. 30, 2024 502.2    
Beginning Balance at Jun. 30, 2024   339.3 169.3
Beginning Balance at Jun. 30, 2024 508.6    
Net Income 0.0   0.0
Dividends on Common Shares (6.9)   (6.9)
Stock Compensation Plans 0.3 0.3  
Issuance of Common Shares 0.2 0.2  
Ending Balance at Sep. 30, 2024 502.4 339.8 162.4
Ending Balance at Sep. 30, 2024 502.2    
Beginning Balance at Dec. 31, 2024 512.5 341.2 171.1
Beginning Balance at Dec. 31, 2024 512.3    
Net Income 31.2   31.2
Dividends on Common Shares (22.0)   (22.0)
Stock Compensation Plans 2.1 2.1  
Issuance of Common Shares 73.4 73.4  
Ending Balance at Sep. 30, 2025 597.2 416.7 180.3
Ending Balance at Sep. 30, 2025 597.0    
Beginning Balance at Jun. 30, 2025   344.6 188.0
Beginning Balance at Jun. 30, 2025 532.6    
Net Income (0.3)   (0.3)
Dividends on Common Shares (7.4)   (7.4)
Stock Compensation Plans 0.6 0.6  
Issuance of Common Shares 71.5 71.5  
Ending Balance at Sep. 30, 2025 597.2 $ 416.7 $ 180.3
Ending Balance at Sep. 30, 2025 $ 597.0