CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net income	$ 51.1	$ 45.4
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization expense	27.6	23.4
Recoveries and refunds of regulatory assets and liabilities	21.7	(1.9)
Bad debt expense	0.9	0.3
Pension and other postretirement (credit) expense	(0.3)	5.7
Pension and other postretirement contributions	(46.2)	(37.6)
Deferred income taxes and investment tax credits	14.7	37.6
Equity income, net of dividends	(0.1)	(0.3)
Termination of tolling agreement with Fox Energy Company LLC	0	(50.0)
Other	(17.2)	(3.3)
Changes in working capital
Accounts receivable and accrued unbilled revenues	(46.2)	(18.8)
Inventories	28.0	31.5
Prepaid taxes	32.9	(1.0)
Other current assets	(1.3)	3.3
Accounts payable	33.6	(22.4)
Other current liabilities	(2.8)	14.4
Net cash provided by operating activities	96.4	26.3
Investing Activities
Capital expenditures	(58.8)	(52.6)
Proceeds from the sale or disposal of assets	0.3	0.4
Acquisition of Fox Energy Company LLC	0	(391.6)
Grant received related to Crane Creek wind project	0	69.0
Other	0.3	0
Net cash used for investing activities	(58.2)	(374.8)
Financing Activities
Short-term debt, net	(7.4)	8.3
Borrowing on term credit facility	0	200.0
Repayment of long-term debt	0	(22.0)
Repayment of long-term debt to parent	(0.2)	(0.2)
Payment of dividends to parent	(28.0)	(27.1)
Equity contribution from parent	0	200.0
Preferred stock dividend requirements	(0.8)	(0.8)
Other	(0.1)	(0.2)
Net cash (used for) provided by financing activities	(36.5)	358.0
Net change in cash and cash equivalents	1.7	9.5
Cash and cash equivalents at beginning of period	5.7	6.5
Cash and cash equivalents at end of period	7.4	16.0
Supplemental Cash Flow Information
Cash paid for interest	0.1	0.6
Cash received for income taxes	$ (15.0)	$ (1.1)