CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 398.2	$ 370.8
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	260.8	240.8
Deferred income taxes and investment tax credits, net	25.2	63.7
Equity in earnings of unconsolidated affiliates	(104.8)	(103.3)
Distributions from unconsolidated affiliates	107.3	103.3
Allowance for equity funds used during construction	(3.7)	(20.0)
Stock-based compensation expense	10.8	9.7
Regulatory assets	(48.1)	(4.8)
Regulatory liabilities	(32.1)	(3.7)
Other assets	4.3	(2.1)
Other liabilities	5.1	(1.4)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(76.4)	(56.4)
Fuel, materials and supplies inventories	8.0	14.9
Fuel recoveries	(44.8)	37.5
Other current assets	3.4	19.3
Accounts payable	(69.1)	(34.1)
Other current liabilities	(17.5)	73.3
Net cash provided from operating activities	418.0	711.7
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(476.5)	(413.8)
Investment in unconsolidated affiliates	(5.9)	(1.9)
Return of capital - unconsolidated affiliates	0.0	2.6
Net cash used in investing activities	(482.4)	(413.1)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Issuance of Long-term Debt	296.4	396.0
Increase (decrease) in short-term debt	168.8	(168.4)
Payment of long-term debt	(250.0)	(250.0)
Dividends paid on common stock	(221.7)	(199.4)
Cash paid for employee equity-based compensation and expense of common stock	(10.2)	(0.5)
Net cash provided from (used in) financing activities	(16.7)	(222.3)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(81.1)	76.3
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	94.3	14.4
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 13.2	$ 90.7