CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net income	$ 45.4	$ 42.9
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization expense	23.4	23.9
Recoveries and refunds of regulatory assets and liabilities	(1.9)	3.8
Bad debt expense	0.3	0.9
Pension and other postretirement expense	5.7	5.1
Pension and other postretirement contributions	(37.6)	(109.1)
Deferred income taxes and investment tax credits	37.6	13.6
Repayment of related party payable		(22.6)
Equity income, net of dividends	(0.3)	(0.1)
Termination of tolling agreement with Fox Energy Company LLC	(50.0)
Other	(3.3)	(15.7)
Changes in working capital
Accounts receivable and accrued unbilled revenues	(18.8)	13.5
Inventories	31.5	19.8
Prepaid taxes	(1.0)	43.2
Other current assets	3.3	2.6
Accounts payable	(22.4)	(26.2)
Other current liabilities	14.4	17.3
Net cash provided by operating activities	26.3	12.9
Investing Activities
Capital expenditures	(52.6)	(32.5)
Acquisition of Fox Energy Company LLC	(391.6)
Grant received related to Crane Creek Wind Project	69.0
Proceeds from the sale of property, plant, and equipment	0.4	0.4
Other		0.3
Net cash used for investing activities	(374.8)	(31.8)
Financing Activities
Borrowing on term credit facility	200.0
Short-term debt, net	8.3	6.2
Repayment of long-term debt to parent	(0.2)	(0.2)
Repayment of long-term debt	(22.0)
Payment of dividends to parent	(27.1)	(26.4)
Equity contribution from parent	200.0	40.0
Preferred stock dividend requirements	(0.8)	(0.8)
Other	(0.2)
Net cash provided by financing activities	358.0	18.8
Net change in cash and cash equivalents	9.5	(0.1)
Cash and cash equivalents at beginning of period	6.5	5.5
Cash and cash equivalents at end of period	$ 16.0	$ 5.4