CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income	$ 201.4	$ 192.2
Reconciliation to cash provided by operating activities
Depreciation and amortization	140.0	129.7
Deferred income taxes and ITCs, net	54.9	51.3
Change in –
Accounts receivable and unbilled revenues, net	7.1	44.9
Materials, supplies, and inventories	(4.7)	0.7
Prepaid taxes	10.9	26.1
Other current assets	0.2	7.0
Accounts payable	(17.3)	(38.3)
Accrued taxes	14.2	3.1
Other current liabilities	32.4	(0.5)
Other, net	(14.2)	(2.1)
Net cash provided by operating activities	424.9	414.1
Investing activities
Capital expenditures	(280.2)	(381.0)
Proceeds from cash surrender value of life insurance	0.0	7.1
Payments for assets transferred from affiliates	(5.3)	0.0
Other, net	(0.2)	0.0
Net cash used in investing activities	(285.7)	(373.9)
Financing activities
Change in short-term debt	(104.0)	(75.5)
Payment of dividends to parent	(90.0)	(170.0)
Equity contribution from parent	55.0	205.0
Net cash used in financing activities	(139.0)	(40.5)
Net change in cash and cash equivalents	0.2	(0.3)
Cash and cash equivalents at beginning of period	2.7	2.3
Cash and cash equivalents at end of period	$ 2.9	$ 2.0