CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 2.4	$ 6.8
Accounts receivable, less reserve of $1.1 and $1.9, respectively	191.9	179.4
Accounts receivable - unconsolidated affiliates	10.3	12.4
Accrued unbilled revenues	51.7	58.7
Income taxes receivable	5.6	5.6
Fuel inventories	82.4	74.4
Materials and supplies, at average cost	76.7	80.7
Deferred income taxes	188.6	215.8
Fuel clause under recoveries	62.0	26.2
Other	30.9	34.6
Total current assets	702.5	694.6
OTHER PROPERTY AND INVESTMENTS
Investment in unconsolidated affiliates	1,314.2	1,298.8
Other	63.1	61.0
Total other property and investments	1,377.3	1,359.8
PROPERTY, PLANT AND EQUIPMENT
In service	9,302.9	9,183.1
Construction work in progress	470.3	468.5
Total property, plant and equipment	9,773.2	9,651.6
Less accumulated depreciation	3,010.9	2,978.8
Net property, plant and equipment	6,762.3	6,672.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	374.4	379.1
Other	34.2	28.4
Total deferred charges and other assets	408.6	407.5
TOTAL ASSETS	9,250.7	9,134.7
CURRENT LIABILITIES
Short-term debt	377.8	439.6
Accounts payable	209.6	251.0
Dividends payable	44.8	44.7
Customer deposits	71.4	70.9
Accrued taxes	26.0	39.9
Accrued interest	34.2	43.4
Accrued compensation	38.2	56.9
Long-term debt due within one year	100.0	100.0
Fuel clause over recoveries	0	0.4
Other	47.3	47.0
Total current liabilities	949.3	1,093.8
LONG-TERM DEBT	2,549.4	2,300.1
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	242.8	241.5
Deferred income taxes	2,119.8	2,125.3
Deferred investment tax credits	1.6	1.9
Regulatory liabilities	237.6	234.2
Other	112.4	100.8
Total deferred credits and other liabilities	2,714.2	2,703.7
Total liabilities	6,212.9	6,097.6
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,069.6	1,073.6
Retained earnings	1,996.1	1,991.7
Accumulated other comprehensive loss, net of tax	(27.9)	(28.2)
Total stockholders' equity	3,037.8	3,037.1
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 9,250.7	$ 9,134.7