Consolidated Statement of Cash Flows (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities
Net Income	$ 54.0	$ 42.2
Allowance for Funds Used During Construction	(1.1)	(2.1)
Income from Equity Investments, Net of Dividends	(0.9)	(1.4)
Gain on Sale of Assets	(0.7)	(0.7)
Depreciation Expense	44.4	39.8
Amortization of Debt Issuance Costs	0.5	0.5
Deferred Income Tax Expense	11.8	23.1
Share-Based Compensation Expense	1.1	1.1
ESOP Compensation Expense	3.6	3.5
Bad Debt Expense	0.5	0.5
Changes in Operating Assets and Liabilities
Accounts Receivable	27.2	10.1
Inventories	(1.3)	(0.1)
Prepayments and Other	8.0	2.4
Accounts Payable	(17.7)	(10.4)
Other Current Liabilities	(10.1)	(3.7)
Changes in Regulatory and Other Non-Current Assets	(2.5)	5.1
Changes in Defined Benefit Pension and Other Postretirement Benefit Plans	(8.5)	(0.4)
Changes in Regulatory and Other Non-Current Liabilities	21.7	(1.0)
Cash from Operating Activities	130.0	108.5
Investing Activities
Proceeds from Sale of Available-for-sale Securities	7.2	0.5
Payments for Purchase of Available-for-sale Securities	(1.2)	(1.4)
Investment in ATC	(1.4)	(1.2)
Changes to Other Investments	(1.4)	(0.6)
Additions to Property, Plant and Equipment	(91.6)	(79.5)
Proceeds from Sale of Assets	1.4	0
Cash for Investing Activities	(87.0)	(82.2)
Financing Activities
Proceeds from Issuance of Common Stock	22.9	15.2
Proceeds from Issuance of Long-Term Debt	0	80.0
Payments on Long-Term Debt	(1.5)	(69.9)
Debt Issuance Costs	0	(0.7)
Dividends on Common Stock	(31.4)	(30.8)
Changes in Notes Payable	1.5	(0.5)
Cash for Financing Activities	(8.5)	(6.7)
Change in Cash and Cash Equivalents	34.5	19.6
Cash and Cash Equivalents at Beginning of Period	44.9	25.7
Cash and Cash Equivalents at End of Period	$ 79.4	$ 45.3