CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net income	$ 128.7	$ 138.8
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	157.7	148.2
Deferred income taxes	5.9	(1.2)
Amortization of investment tax credits	(0.6)	(0.6)
Allowance for equity funds used during construction	(8.6)	(4.1)
Net realized and unrealized hedging and derivative transactions	1.7	(2.6)
Changes in operating assets and liabilities:
Accounts receivable	7.8	(54.7)
Accrued unbilled revenues	75.3	32.2
Inventories	30.4	33.5
Prepayments and other	8.3	(9.3)
Accounts payable	(94.6)	(45.7)
Net regulatory assets and liabilities	42.7	93.2
Other current liabilities	32.6	42.6
Pension and other employee benefit obligations	(48.4)	(43.7)
Other, net	(5.9)	1.9
Net cash provided by operating activities	333.0	328.5
Investing activities
Utility capital/construction expenditures	(458.4)	(282.9)
Investments in utility money pool arrangement	0.0	(131.0)
Repayments from utility money pool arrangement	0.0	131.0
Net cash used in investing activities	(458.4)	(282.9)
Financing activities
Repayments of short-term borrowings, net	0.0	(68.0)
Borrowings under utility money pool arrangement	446.0	0.0
Repayments under utility money pool arrangement	(289.0)	0.0
Proceeds from issuance of long-term debt	0.0	392.6
Repayments of long-term debt	0.0	400.0
Capital contributions from parent	83.4	112.2
Dividends paid to parent	(111.5)	(91.6)
Other, net	(0.3)	0.0
Net cash provided by financing activities	128.6	(54.8)
Net change in cash, cash equivalents and restricted cash	3.2	(9.2)
Cash, cash equivalents and restricted cash at beginning of period	11.4	33.4
Cash, cash equivalents and restricted cash at end of period	14.6	24.2
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(72.6)	(65.3)
Cash paid for income taxes, net	1.9	(10.7)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	132.1	85.1
Inventory transfers to property, plant and equipment	8.1	6.9
Operating lease right-of-use assets	0.0	652.8
Allowance for equity funds used during construction	$ 8.6	$ 4.1