Consolidated Condensed Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment
In service	$ 14,325.3	$ 14,238.8
Accumulated depreciation	(4,098.4)	(4,036.0)
Property, Plant and Equipment in Service, Net	10,226.9	10,202.8
Construction work in progress	337.1	315.9
Leased facilities, net	52.1	53.5
Net Property, Plant and Equipment	10,616.1	10,572.2
Investments
Equity investment in transmission affiliate	383.0	378.3
Other	36.8	35.5
Total Investments	419.8	413.8
Current Assets
Cash and cash equivalents	24.7	35.6
Restricted cash	0	2.7
Accounts receivable, net	389.0	285.3
Accrued revenues	246.3	278.1
Materials, supplies and inventories	266.8	360.7
Prepayments and other	387.0	351.5
Total Current Assets	1,313.8	1,313.9
Deferred Charges and Other Assets
Regulatory assets	1,323.9	1,339.0
Goodwill	441.9	441.9
Other	179.8	204.2
Total Deferred Charges and Other Assets	1,945.6	1,985.1
Total Assets	14,295.3	14,285.0
Capitalization
Common equity	4,203.6	4,135.1
Preferred stock of subsidiary	30.4	30.4
Long-term debt	4,441.0	4,453.8
Total Capitalization	8,675.0	8,619.3
Current Liabilities
Long-term debt due currently	413.5	412.1
Short-term debt	316.7	394.6
Accounts payable	257.1	368.4
Accrued payroll and benefits	71.7	100.9
Other	219.1	167.3
Total Current Liabilities	1,278.1	1,443.3
Deferred Credits and Other Liabilities
Regulatory liabilities	853.7	866.5
Deferred income taxes - long-term	2,275.6	2,117.0
Deferred revenue, net	702.6	709.7
Pension and other benefit obligations	233.9	244.0
Other	276.4	285.2
Total Deferred Credits and Other Liabilities	4,342.2	4,222.4
Total Capitalization and Liabilities	$ 14,295.3	$ 14,285.0