CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 130.7	$ 150.1
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	152.1	135.5
Deferred income taxes and investment tax credits, net	48.1	60.3
Equity in earnings of unconsolidated affiliates	(59.9)	(87.2)
Distributions from unconsolidated affiliates	68.9	76.5
Allowance for equity funds used during construction	(3.2)	(1.9)
Gain on disposition of assets	0.0	(0.2)
Stock-based compensation	2.4	(7.0)
Regulatory assets	2.5	(0.5)
Regulatory liabilities	(2.0)	(5.4)
Other assets	4.5	(27.6)
Other liabilities	(2.4)	19.5
Change in certain current assets and liabilities
Accounts receivable, net	2.9	(8.0)
Accounts receivable - unconsolidated affiliates	3.2	5.0
Accrued unbilled revenues	(30.8)	(23.6)
Fuel, materials and supplies inventories	(29.7)	22.0
Fuel clause under recoveries	64.6	(55.9)
Other current assets	(10.2)	1.5
Accounts payable	(40.7)	(61.0)
Fuel clause over recoveries	1.6	(0.4)
Other current liabilities	3.2	(9.9)
Net Cash Provided from Operating Activities	305.8	181.8
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(227.7)	(297.6)
Proceeds from sale of assets	2.0	0.6
Net Cash Used in Investing Activities	(225.7)	(297.0)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid on common stock	(99.8)	(89.5)
Proceeds from long-term debt	0.0	246.5
Issuance of common stock	6.8	6.7
Payment of long-term debt	(0.1)	(0.1)
Increase (decrease) in short-term debt	7.5	(53.0)
Net Cash (Used in) Provided from Financing Activities	(85.6)	110.6
NET CHANGE IN CASH AND CASH EQUIVALENTS	(5.5)	(4.6)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	5.5	6.8
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0.0	$ 2.2