CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net income	$ 107.0	$ 113.2
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	203.9	199.0
Nuclear fuel amortization	32.5	30.5
Deferred income taxes	(14.9)	(14.6)
Amortization of investment tax credits	(0.3)	(0.3)
Allowance for equity funds used during construction	(7.0)	(5.1)
Net realized and unrealized hedging and derivative transactions	8.9	6.4
Changes in operating assets and liabilities:
Accounts receivable	8.4	(39.0)
Accrued unbilled revenues	51.7	49.2
Inventories	20.0	52.8
Other current assets	(14.7)	(30.2)
Accounts payable	(43.0)	(48.2)
Net regulatory assets and liabilities	32.8	54.7
Other current liabilities	(3.8)	18.0
Pension and other employee benefit obligations	(48.0)	(46.6)
Other, net	6.9	(9.1)
Net cash provided by operating activities	340.4	330.7
Investing activities
Utility capital/construction expenditures	(274.3)	(197.3)
Purchases of investment securities	(835.0)	(304.7)
Proceeds from the sale of investment securities	829.9	299.6
Investments in utility money pool arrangement	(305.0)	(38.0)
Repayments from utility money pool arrangement	257.0	0.0
Other, net	1.6	(0.3)
Net cash used in investing activities	(325.8)	(240.7)
Financing activities
Repayments of short-term borrowings, net	(30.0)	(150.0)
Borrowings under utility money pool arrangement	118.0	31.0
Repayments under utility money pool arrangement	(118.0)	(31.0)
Proceeds from issuance of long-term debt	0.0	0.0
Repayments of Long-term Debt		0.0	$ 0.0
Capital contributions from parent	114.0	134.9
Dividends paid to parent	(94.3)	(82.8)
Proceeds from (Payments for) Other Financing Activities	(3.4)	0.0
Net cash used in financing activities	(13.7)	(97.9)
Net change in cash, cash equivalents and restricted cash	0.9	(7.9)
Cash, cash equivalents and restricted cash at beginning of period	126.3	50.0
Cash, cash equivalents and restricted cash at end of period	127.2	42.1
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(74.7)	(68.2)
Cash paid for income taxes, net	(5.5)	(22.0)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	66.6	110.8
Inventory transfers to plant, property and equipment	4.0	4.4
Operating lease right-of-use assets	0.0	444.2
Allowance for equity funds used during construction	$ 7.0	$ 5.1