CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net income	$ 66.3	$ 76.6
Reconciliation to cash provided by operating activities
Depreciation and amortization	55.0	49.7
Deferred income taxes and ITCs, net	5.0	20.6
Change in –
Accounts receivable and unbilled revenues, net	9.7	(2.4)
Materials, supplies, and inventories	29.1	30.4
Prepaid taxes	19.3	10.4
Collateral on deposit	(14.0)	0.0
Other current assets	4.1	1.4
Accounts payable	(48.9)	(30.9)
Accrued interest	15.3	11.4
Amounts refundable to customers	26.4	4.2
Other current liabilities	(7.1)	13.5
Other, net	(9.7)	(21.3)
Net cash provided by operating activities	150.5	163.6
Investing activities
Capital expenditures	(98.0)	(68.0)
Acquisition of Whitewater	(38.0)	0.0
Proceeds from cash surrender value of life insurance	0.0	4.4
Other, net	(0.2)	1.0
Net cash used in investing activities	(136.2)	(62.6)
Financing activities
Change in short-term debt	(149.9)	(196.0)
Payment of dividends to parent	(65.0)	(30.0)
Equity contribution from parent	165.0	125.0
Other, net	(0.2)	(0.4)
Net cash used in financing activities	(50.1)	(101.4)
Net change in cash, cash equivalents, and restricted cash	(35.8)	(0.4)
Cash, cash equivalents, and restricted cash at beginning of period	38.5	2.4
Cash, cash equivalents, and restricted cash at end of period	$ 2.7	$ 2.0