CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 98.0	$ 79.4	$ 69.1
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	127.6	112.7	99.8
Deferred income taxes	23.3	45.6	37.4
Allowance for equity funds used during construction	(9.2)	(6.7)	(4.3)
Provision for bad debts	4.2	4.1	3.7
Net derivative losses	(0.1)	0.1	0.2
Changes in operating assets and liabilities:
Accounts receivable	(4.6)	(9.9)	(1.4)
Accrued unbilled revenues	3.8	(6.4)	(5.9)
Inventories	(7.5)	0.6	3.3
Other current assets	2.1	0.9	(1.2)
Accounts payable	(9.1)	9.0	10.6
Net regulatory assets and liabilities	(19.8)	(31.2)	(18.6)
Other current liabilities	(13.1)	(2.2)	14.0
Pension and other employee benefit obligations	(14.6)	(8.6)	(6.2)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	2.7	(7.6)	0.2
Net cash provided by operating activities	183.7	179.8	200.7
Investing activities
Utility capital/construction expenditures	(226.6)	(212.1)	(200.1)
Other, net	0.2	0.0	1.2
Net cash used in investing activities	(226.4)	(212.1)	(198.9)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	40.0	(49.0)	50.0
Proceeds from issuance of long-term debt	196.6	97.5	0.0
Repayments of long-term debt	(151.1)	(0.1)	(0.1)
Capital contributions from parent	49.2	48.0	1.9
Dividends paid to parent	(91.1)	(64.0)	(53.1)
Other, net	(0.1)	(0.2)	(0.1)
Net cash provided by (used in) financing activities	43.5	32.2	(1.4)
Net change in cash and cash equivalents	0.8	(0.1)	0.4
Cash and cash equivalents at beginning of period	1.4	1.5	1.1
Cash and cash equivalents at end of period	2.2	1.4	1.5
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(32.9)	(30.9)	(30.9)
Cash (paid) received for income taxes, net	(20.6)	(5.0)	5.9
Supplemental disclosure of non-cash investing transactions:
Accrued property, plant and equipment additions	32.0	31.0	22.7
Inventory transfers to plant, property and equipment	8.2	5.5	8.3
Allowance for Funds Used During Construction, Investing Activities	$ 9.2	$ 6.7	$ 4.3