CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income	$ 336.2	$ 304.8
Reconciliation to cash provided by operating activities
Depreciation and amortization	340.7	318.4
Deferred income taxes and ITCs, net	(37.2)	(43.4)
Change in –
Accounts receivable and unbilled revenues, net	(42.7)	30.6
Prepaid taxes	29.6	34.5
Other current assets	8.4	19.8
Accounts payable	66.0	(69.6)
Accrued taxes	31.2	13.9
Other current liabilities	62.8	7.5
Other, net	36.7	27.9
Net cash provided by operating activities	831.7	644.4
Investing activities
Capital expenditures	(625.9)	(462.8)
Proceeds from assets transferred to affiliates	10.7	1.3
Other, net	4.6	9.5
Net cash used in investing activities	(610.6)	(452.0)
Financing activities
Change in short-term debt	(269.5)	(115.5)
Issuance of long-term debt	418.8	0.0
Retirement of long-term debt	(300.0)	0.0
Payments for finance lease obligations	(49.8)	(43.0)
Equity contribution from parent	230.0	130.0
Payment of dividends to parent	(240.0)	(180.0)
Other, net	(7.1)	(1.1)
Net cash used in financing activities	(217.6)	(209.6)
Net change in cash, cash equivalents, and restricted cash	3.5	(17.2)
Cash, cash equivalents, and restricted cash at beginning of period	7.2	19.1
Cash, cash equivalents, and restricted cash at end of period	$ 10.7	$ 1.9