v3.26.3
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 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   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 $ 9.6            
Cash and Cash Equivalent 67.5     $ 60.7      
Accounts Receivable, Allowance for Credit Loss (9.6)     (8.8) $ (8.9)   $ (6.1)
Accounts Receivable, after Allowance for Credit Loss, Current 178.3     160.7      
Inventories 72.3     69.2      
Taxes Applicable to Subsequent Years 37.4     150.4      
Regulatory Asset, Current 54.3     61.1      
Income Taxes Receivable, Current 22.2     24.2      
Other Assets, Current 24.5     9.9      
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization (1,204.4)     (1,172.4)      
Regulatory Asset, Noncurrent 103.6     137.4      
Intangible Asset, Excluding Goodwill, after Accumulated Amortization 166.3     165.6      
Other Assets, Noncurrent 22.0     32.2      
Liabilities, Current 584.2     369.0      
Current portion of long-term debt 139.9     0.2      
Accounts payable 155.7     144.1      
Accrued taxes 160.6     145.5      
Accrued interest 14.7     15.5      
Contract with Customer, Liability, Current 20.9     8.8      
Regulatory liabilities, current 8.0     1.8      
Other current liabilities 84.4     53.1      
Long-term debt 1,245.8     1,384.6      
Deferred Tax Liabilities, Net 259.0     233.3      
Taxes payable 0.4     150.9      
Regulatory liabilities, non-current 206.4     189.5      
Pension, retiree and other benefits 9.3     16.5      
Other deferred credits 4.9     4.4      
Common Stock, Value, Issued 0.4     0.4      
Other paid-in capital 1,481.2     1,356.2      
Accumulated other comprehensive income (21.1)     (22.3)      
Retained Earnings (Accumulated Deficit) 113.0     48.3      
Liabilities $ 2,310.0     $ 2,348.2