v3.26.1
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Common Stock, Shares Authorized 50,000,000 50,000,000    
Common stock, shares issued 41,172,173      
Common Stock, Shares, Outstanding 41,172,173 41,172,173 41,172,173 41,172,173
Common stock, par value (in USD per share) $ 0.01 $ 0.01    
Accounts Receivable, Allowance for Credit Loss, Current $ 11.9      
Cash and Cash Equivalent 41.4 $ 60.7    
Accounts Receivable, Allowance for Credit Loss (11.9) (8.8) $ (8.1) $ (6.1)
Accounts Receivable, after Allowance for Credit Loss, Current 166.1 160.7    
Inventories 66.8 69.2    
Taxes Applicable to Subsequent Years 112.8 150.4    
Regulatory Asset, Current 53.8 61.1    
Income Taxes Receivable, Current 23.7 24.2    
Other Assets, Current 10.5 9.9    
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization (1,189.8) (1,172.4)    
Regulatory Asset, Noncurrent 128.2 137.4    
Intangible Asset, Excluding Goodwill, after Accumulated Amortization 165.6 165.6    
Other Assets, Noncurrent 24.0 32.2    
Liabilities, Current 389.1 369.0    
Current portion of long-term debt 30.2 0.2    
Accounts payable 125.6 144.1    
Accrued taxes 152.7 145.5    
Accrued interest 14.5 15.5    
Contract with Customer, Liability, Current 16.9 8.8    
Regulatory liabilities, current 1.2 1.8    
Other current liabilities 48.0 53.1    
Long-term debt 1,385.0 1,384.6    
Deferred Tax Liabilities, Net 245.1 233.3    
Taxes payable 75.6 150.9    
Regulatory liabilities, non-current 191.7 189.5    
Pension, retiree and other benefits 9.4 16.5    
Other deferred credits 3.8 4.4    
Common Stock, Value, Issued 0.4 0.4 0.4 0.4
Other paid-in capital 1,356.1 1,356.2 1,177.6 1,177.6
Accumulated other comprehensive income (21.9) (22.3) (25.9) (26.4)
Retained Earnings (Accumulated Deficit) 83.0 48.3 $ 36.9 $ 26.2
Liabilities $ 2,299.7 $ 2,348.2