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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
CURRENT ASSETS    
Cash and cash equivalents $ 0.3 $ 75.2
Accounts receivable, less reserve of $1.5 and $1.4, respectively 173.0 173.1
Accounts receivable - unconsolidated affiliates 2.5 1.7
Accrued unbilled revenues 59.7 53.5
Income taxes receivable 19.4 17.2
Fuel inventories 79.8 113.8
Materials and supplies, at average cost 81.7 80.1
Fuel clause under recoveries 51.3 0.0
Other 81.8 55.6
Total current assets 549.5 570.2
OTHER PROPERTY AND INVESTMENTS    
Investment in unconsolidated affiliates 1,158.6 1,194.4
Other 73.6 70.7
Total other property and investments 1,232.2 1,265.1
PROPERTY, PLANT AND EQUIPMENT    
In service 10,690.0 10,318.3
Construction work in progress 495.1 278.5
Total property, plant and equipment 11,185.1 10,596.8
Less accumulated depreciation 3,488.9 3,274.4
Net property, plant and equipment 7,696.2 7,322.4
DEFERRED CHARGES AND OTHER ASSETS    
Regulatory assets 404.8 402.2
Other 56.9 20.7
Total deferred charges and other assets 461.7 422.9
TOTAL ASSETS 9,939.6 9,580.6
CURRENT LIABILITIES    
Short-term debt 236.2 0.0
Accounts payable 205.4 262.5
Dividends payable 60.4 54.9
Customer deposits 77.7 77.0
Accrued taxes 41.3 45.9
Accrued interest 40.4 42.9
Accrued compensation 45.1 54.4
Long-term debt due within one year 224.7 110.0
Fuel clause over recoveries 0.0 61.3
Other 96.0 43.9
Total current liabilities 1,027.2 752.8
LONG-TERM DEBT 2,405.8 2,628.8
DEFERRED CREDITS AND OTHER LIABILITIES    
Accrued benefit obligations 274.8 299.9
Deferred income taxes 2,334.5 2,178.2
Regulatory liabilities 299.7 273.6
Other 153.8 121.3
Total deferred credits and other liabilities 3,062.8 2,873.0
Total liabilities 6,495.8 6,254.6
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY    
Common stockholders' equity 1,105.8 1,101.3
Retained earnings 2,367.3 2,259.8
Accumulated other comprehensive loss, net of tax (29.3) (35.1)
Total stockholders' equity 3,443.8 3,326.0
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 9,939.6 $ 9,580.6