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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
CURRENT ASSETS    
Cash and cash equivalents $ 14.4 $ 0.3
Accounts receivable, less reserve of $1.5 and $1.5, respectively 188.7 173.0
Accounts receivable - unconsolidated affiliates 1.9 2.5
Accrued unbilled revenues 66.5 59.7
Income taxes receivable 5.8 19.4
Fuel inventories 84.3 79.8
Materials and supplies, at average cost 80.8 81.7
Fuel clause under recoveries 0.0 51.3
Other 54.6 81.8
Total current assets 497.0 549.5
OTHER PROPERTY AND INVESTMENTS    
Investment in unconsolidated affiliates 1,160.4 1,158.6
Other 76.7 73.6
Total other property and investments 1,237.1 1,232.2
PROPERTY, PLANT AND EQUIPMENT    
In service 11,041.2 10,690.0
Construction work in progress 867.5 495.1
Total property, plant and equipment 11,908.7 11,185.1
Less accumulated depreciation 3,568.8 3,488.9
Net property, plant and equipment 8,339.9 7,696.2
DEFERRED CHARGES AND OTHER ASSETS    
Regulatory assets 283.0 404.8
Other 55.7 56.9
Total deferred charges and other assets 338.7 461.7
TOTAL ASSETS 10,412.7 9,939.6
CURRENT LIABILITIES    
Short-term debt 168.4 236.2
Accounts payable 230.4 205.4
Dividends payable 66.4 60.4
Customer deposits 80.7 77.7
Accrued taxes 44.5 41.3
Accrued interest 44.0 40.4
Accrued compensation 35.9 45.1
Long-term debt due within one year 249.8 224.7
Fuel clause over recoveries 1.7 0.0
Other 28.7 96.0
Total current liabilities 950.5 1,027.2
LONG-TERM DEBT 2,749.6 2,405.8
DEFERRED CREDITS AND OTHER LIABILITIES    
Accrued benefit obligations 192.7 274.8
Deferred income taxes 1,227.8 2,334.5
Regulatory liabilities 1,283.4 299.7
Other 157.6 153.8
Total deferred credits and other liabilities 2,861.5 3,062.8
Total liabilities 6,561.6 6,495.8
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY    
Common stockholders' equity 1,114.8 1,105.8
Retained earnings 2,759.5 2,367.3
Accumulated other comprehensive loss, net of tax (23.2) (29.3)
Total stockholders' equity 3,851.1 3,443.8
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 10,412.7 $ 9,939.6