CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income	$ 66.3	$ 62.7
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization expense	47.9	47.7
Recoveries and refunds of regulatory assets and liabilities	7.6	14.6
Bad debt expense	2.2	2.8
Pension and other postretirement expense	10.5	10.9
Pension and other postretirement contributions	(109.3)	(61.0)
Deferred income taxes and investment tax credit	25.6	36.6
Repayment of related party payable	(22.6)
Equity income, net of dividends	(0.9)	(0.9)
Other	(15.1)	5.3
Changes in working capital
Collateral on deposit	(0.9)	1.6
Accounts receivable and accrued unbilled revenues	24.4	24.0
Inventories	34.5	(1.4)
Prepaid taxes	34.7	(26.8)
Other current assets	4.0	0.9
Accounts payable	(17.7)	(10.7)
Other current liabilities	15.8	0.8
Net cash provided by operating activities	107.0	107.1
Investing Activities
Capital expenditures	(73.9)	(42.4)
Proceeds from the sale or disposal of assets	1.7	1.5
Other	1.9	1.0
Net cash used for investing activities	(70.3)	(39.9)
Financing Activities
Short-term debt, net	(23.3)	5.1
Redemption of notes payable		(10.0)
Repayment of long-term debt to parent	(0.4)	(0.3)
Dividends to parent	(52.8)	(51.2)
Equity contribution from parent	40.0
Return of capital to parent		(75.0)
Preferred stock dividend requirements	(1.6)	(1.6)
Other	0.6	0.8
Net cash used for financing activities	(37.5)	(132.2)
Net change in cash and cash equivalents	(0.8)	(65.0)
Cash and cash equivalents at beginning of period	5.5	71.4
Cash and cash equivalents at end of period	$ 4.7	$ 6.4