CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 216.0	$ 211.6	$ 197.3
Adjustments to reconcile net income to cash from operating activities:
Depreciation & amortization	276.2	260.0	256.3
Deferred income taxes & investment tax credits	19.0	100.1	80.4
Provision for uncollectible accounts	5.9	6.9	8.1
Expense portion of pension & postretirement benefit cost	5.4	3.6	6.8
Other non-cash items - net	12.9	7.8	7.3
Changes in working capital accounts:
Accounts receivable & accrued unbilled revenues	(80.9)	(39.6)	(15.4)
Inventories	3.3	3.9	(15.2)
Recoverable/refundable fuel & natural gas costs	10.7	(37.8)	15.2
Prepayments & other current assets	5.7	22.9	20.3
Accounts payable, including to affiliated companies	65.9	40.7	(0.5)
Accrued liabilities	15.6	22.7	(0.9)
Employer contributions to pension & postretirement plans	(4.6)	(19.6)	(26.5)
Changes in noncurrent assets	(40.6)	(44.0)	(21.9)
Changes in noncurrent liabilities	(11.7)	(15.1)	(6.1)
Net cash from operating activities	498.8	524.1	505.2
Proceeds from:
Long-term debt, net of issuance costs	198.5	0.0	385.5
Dividend reinvestment plan & other common stock issuances	6.3	6.3	6.2
Requirements for:
Dividends on common stock	(141.9)	(134.2)	(127.3)
Retirement of long-term debt	(75.0)	(73.0)	(170.0)
Other financing activities	0.0	0.0	0.2
Net change in short-term borrowings	55.1	179.9	(141.9)
Net cash from financing activities	43.0	(21.0)	(47.3)
Proceeds from sale of assets and other collections
Proceeds from sale of assets and other collections	11.3	33.0	27.5
Requirements for:
Capital expenditures, excluding AFUDC equity	(602.6)	(542.0)	(476.9)
Other costs	(3.4)	(5.2)	(14.3)
Changes in restricted cash	0.9	5.0	(5.9)
Net cash from investing activities	(593.8)	(509.2)	(469.6)
Net change in cash & cash equivalents	(52.0)	(6.1)	(11.7)
Cash & cash equivalents at beginning of period	68.6	74.7	86.4
Cash & cash equivalents at end of period	$ 16.6	$ 68.6	$ 74.7