Balance Sheet (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 8.6	$ 10.4
Accounts receivable - less reserves of $6.7 and $5.3, respectively	221.3	176.6
Accrued unbilled revenues	121.5	162.0
Inventories	161.9	187.1
Recoverable fuel and natural gas costs	12.4	7.9
Prepayments and other current assets	84.3	101.2
Total current assets	610.0	645.2
Utility Plant
Original cost	4,979.9	4,791.7
Less: accumulated depreciation and amortization	1,947.3	1,836.3
Net utility plant	3,032.6	2,955.4
Investments in unconsolidated affiliates	92.9	135.2
Other utility and corporate investments	34.4	34.1
Other nonutility investments	29.6	40.9
Nonutility plant - net	550.8	488.3
Goodwill - net	262.3	242.0
Regulatory assets	226.0	189.4
Other assets	40.3	33.7
TOTAL ASSETS	4,878.9	4,764.2
Current Liabilities
Accounts payable	185.8	183.7
Accounts payable to affiliated companies	36.8	59.6
Accrued liabilities	181.1	178.4
Short-term borrowings	227.1	118.3
Current maturities of long-term debt	62.7	250.7
Long-term debt subject to tender	0	30.0
Total current liabilities	693.5	820.7
Long-term Debt - Net of Current Maturities and Debt Subject to Tender	1,559.6	1,435.2
Deferred Income Taxes and Other Liabilities
Deferred income taxes	575.7	515.3
Regulatory liabilities	345.2	333.5
Deferred credits and other liabilities	239.4	220.6
Total deferred credits and other liabilities	1,160.3	1,069.4
Commitments and Contingencies (Notes 7, 17-20)
Common Shareholders' Equity
Common stock (no par value) - issued and outstanding 81.9 and 81.7, respectively	692.6	683.4
Retained earnings	786.2	759.9
Accumulated other comprehensive income/(loss)	(13.3)	(4.4)
Total common shareholders' equity	1,465.5	1,438.9
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,878.9	$ 4,764.2