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Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 21.1 $ 16.1
Restricted cash and equivalents 8.0 7.3
Accounts receivable, net 251.4 351.2
Materials, supplies and fuel 173.0 153.9
Income tax receivable, net 21.0 19.8
Regulatory assets, current 138.2 154.8
Other current assets 54.9 39.2
Total current assets 667.6 742.3
Property, plant and equipment 10,104.2 9,566.5
Less accumulated depreciation (2,076.5) (1,936.6)
Total property, plant and equipment, net 8,027.7 7,629.9
Other assets:    
Goodwill 1,299.5 1,299.5
Intangible assets, net 6.7 7.6
Regulatory assets, non-current 253.0 272.9
Other assets, non-current 74.5 70.4
Total other assets, non-current 1,633.7 1,650.4
TOTAL ASSETS 10,329.0 10,022.6
Current liabilities:    
Accounts payable 219.1 229.1
Accrued liabilities 292.4 302.2
Derivative liabilities, current 5.2 4.2
Regulatory liabilities, current 91.9 94.1
Notes payable 126.0 133.8
Total current liabilities 734.6 763.4
Long-term debt, net of current maturities 4,252.8 4,250.2
Deferred credits and other liabilities:    
Deferred income tax liabilities, net 679.6 625.1
Regulatory liabilities, non-current 484.7 474.6
Benefit plan liabilities 120.9 122.9
Other deferred credits and other liabilities 205.5 201.2
Total deferred credits and other liabilities 1,490.7 1,423.8
Commitments, contingencies and guarantees (Note 3)
Equity:    
Common stock $1 par value; 100,000,000 shares authorized; issued 75,520,225 and 71,676,756 shares, respectively 75.5 71.7
Additional paid-in capital 2,415.0 2,193.4
Retained earnings 1,289.0 1,249.1
Treasury stock, at cost - 46,443 and 56,608 shares, respectively (2.7) (3.3)
Accumulated other comprehensive (loss) (8.8) (9.4)
Total stockholders’ equity 3,768.0 3,501.5
Non-controlling interest 82.9 83.7
Total equity 3,850.9 3,585.2
TOTAL LIABILITIES AND TOTAL EQUITY $ 10,329.0 $ 10,022.6