CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 36.0	$ 25.2
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	55.6	78.5
Deferred income taxes and investment tax credits, net	20.4	10.4
Equity in earnings of unconsolidated affiliates	(35.6)	(28.3)
Distributions from unconsolidated affiliates	35.3	28.7
Allowance for equity funds used during construction	(6.9)	(1.6)
Stock-based compensation	2.1	1.7
Regulatory assets	(6.4)	(2.3)
Regulatory liabilities	(4.6)	(4.6)
Other assets	(4.0)	2.5
Other liabilities	6.2	2.1
Change in certain current assets and liabilities
Accounts receivable, net	36.4	38.0
Accounts receivable - unconsolidated affiliates	(3.3)	(1.2)
Accrued unbilled revenues	3.5	2.1
Fuel, materials and supplies inventories	(7.7)	10.2
Fuel clause under recoveries	(22.1)	0.0
Other current assets	4.3	(10.0)
Accounts payable	24.9	(44.1)
Fuel clause over recoveries	0.0	2.0
Other current liabilities	(43.1)	(35.9)
Net Cash Provided from Operating Activities	91.0	73.4
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(219.9)	(177.7)
Return of capital - equity method investments	0.0	6.6
Net Cash Used in Investing Activities	(219.9)	(171.1)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid on common stock	(60.4)	(54.9)
Proceeds from long-term debt	297.1	0.0
Payment of long-term debt	(0.1)	(110.1)
Increase (decrease) in short-term debt	(108.0)	187.5
Net cash provided from financing activities	128.6	22.5
NET CHANGE IN CASH AND CASH EQUIVALENTS	(0.3)	(75.2)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.3	75.2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0.0	$ 0.0