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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities      
Net Income (Loss) $ (50.6) $ 128.5 $ 331.5
Adjustments to Reconcile Net Income (Loss) to Net Cash from Operating Actvities:      
Loss on early extinguishment of debt 45.5 111.5 0.0
Depreciation and amortization 599.6 570.3 547.1
Deferred income taxes and investment tax credits (188.2) 306.7 182.3
Stock compensation expense and 401(k) profit sharing contribution 28.6 40.1 46.5
Amortization of discount/premium on debt 7.5 7.4 7.6
AFUDC equity (14.2) (12.6) (11.6)
Other adjustments 1.7 6.6 (7.2)
Changes in Assets and Liabilities:      
Accounts receivable (186.2) (52.3) (188.0)
Inventories 41.4 19.0 38.9
Accounts payable 268.4 49.0 108.8
Customer deposits and credits (25.4) (2.5) (52.3)
Taxes accrued 20.2 10.2 12.1
Interest accrued (21.7) (33.9) (8.7)
Exchange gas receivable/payable (21.5) (64.5) 36.9
Other accruals 43.5 31.8 (6.0)
Prepayments and other current assets (14.5) (13.3) (0.4)
Regulatory assets/liabilities (53.2) 57.5 (187.9)
Postretirement and postemployment benefits 58.2 (380.9) (44.8)
Deferred charges and other noncurrent assets 3.8 (2.0) (1.2)
Other noncurrent liabilities (2.8) (34.4) (0.3)
Net Cash Flows from Operating Activities 540.1 742.2 803.3
Investing Activities      
Capital expenditures (1,818.2) (1,695.8) (1,475.2)
Cost of removal (104.3) (109.0) (110.1)
Purchases of available-for-sale securities (90.0) (168.4) (38.3)
Sales of available-for-sale securities 82.3 163.1 33.0
Other investing activities 4.1 1.6 (12.4)
Net Cash Flows used for Investing Activities (1,926.1) (1,808.5) (1,603.0)
Financing Activities      
Issuance of long-term debt 350.0 3,250.0 500.0
Repayments of long-term debt and capital lease obligations (1,046.1) (1,855.0) (434.6)
Premiums and other debt related costs (46.0) (144.3) (3.7)
Issuance of short-term debt (maturity 90 days) 950.0 0.0 0.0
Change in short-term borrowings, net (maturity ≤ 90 days) (178.5) (282.4) 920.6
Issuance of common stock, net of issuance costs 848.2 336.7 23.1
Issuance of preferred stock, net of issuance costs 880.0 0.0 0.0
Acquisition of treasury stock (4.0) (7.2) (9.4)
Dividends paid - common stock (273.3) (229.1) (205.5)
Dividends paid - preferred stock (11.6) 0.0 0.0
Net Cash Flows from Financing Activities 1,468.7 1,068.7 790.5
Change in cash, cash equivalents and restricted cash 82.7 2.4 (9.2)
Cash, cash equivalents and restricted cash at beginning of period 38.4 36.0 45.2
Cash, Cash Equivalents and Restricted Cash at End of Period $ 121.1 $ 38.4 $ 36.0