CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 370.8	$ 324.2
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	240.8	207.2
Deferred income taxes and investment tax credits, net	63.7	152.1
Equity in earnings of unconsolidated affiliates	(103.3)	(98.6)
Distributions from unconsolidated affiliates	103.3	98.6
Allowance for equity funds used during construction	(20.0)	(27.2)
Stock-based compensation expense	9.7	4.7
Regulatory assets	(4.8)	10.9
Regulatory liabilities	(3.7)	(0.6)
Other assets	(2.1)	2.0
Other liabilities	(1.4)	(70.8)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(56.4)	(97.3)
Fuel, materials and supplies inventories	14.9	4.1
Fuel recoveries	37.5	15.8
Other current assets	19.3	26.8
Accounts payable	(34.1)	(29.1)
Other current liabilities	73.3	(55.1)
Net cash provided from operating activities	711.7	463.7
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(413.8)	(662.8)
Investment in unconsolidated affiliates	(1.9)	(5.2)
Return of capital - unconsolidated affiliates	2.6	7.3
Proceeds from sale of assets	0.0	0.4
Net cash used in investing activities	(413.1)	(660.3)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of long-term debt	(168.4)	(89.7)
Proceeds from long-term debt	396.0	592.3
Issuance (expense) of common stock	(250.0)	(125.1)
Other	(199.4)	(181.2)
Issuance (expense) of common stock	(0.1)	0.0
Other	(0.4)	0.0
Net cash (used in) provided from financing activities	(222.3)	196.3
NET CHANGE IN CASH AND CASH EQUIVALENTS	76.3	(0.3)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	14.4	0.3
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 90.7	$ 0.0