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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating Activities    
Net Income (Loss) $ 242.7 $ 242.7
Adjustments to Reconcile Net Income to Net Cash from Continuing Operations:    
Loss on early extinguishment of debt 0.0 97.2
Depreciation and amortization 406.0 391.0
Deferred income taxes and investment tax credits 137.7 60.1
Stock compensation expense and 401(k) profit sharing contribution 33.6 38.6
Income from discontinued operations - net of taxes (3.4) (108.5)
Amortization of discount/premium on debt 5.4 6.8
AFUDC equity (8.8) (7.7)
Other adjustments (2.3) 11.3
Changes in Assets and Liabilities:    
Accounts receivable 188.2 420.3
Inventories (0.7) 19.8
Accounts payable (83.2) (287.5)
Customer deposits and credits (61.1) (25.5)
Taxes accrued (51.3) (30.6)
Interest accrued (57.9) (63.1)
Exchange gas receivable/payable (0.1) (26.1)
Other accruals (29.8) (57.1)
Prepayments and other current assets 43.9 30.1
Regulatory assets/liabilities (202.2) 259.6
Postretirement and postemployment benefits (20.9) (61.0)
Deferred credits 4.6 (1.3)
Deferred charges and other noncurrent assets (3.0) 10.8
Other noncurrent liabilities (4.6) (13.6)
Net Operating Activities from Continuing Operations 532.8 906.3
Net Operating Activities from (used for) Discontinued Operations (0.8) 287.6
Net Cash Flows from Operating Activities 532.0 1,193.9
Investing Activities    
Capital expenditures (1,083.4) (923.4)
Cash contributions from CPG 0.0 3,798.2
Proceeds from disposition of assets 3.4 4.3
Restricted cash withdrawals (deposits) 15.9 (3.0)
Cost of removal (79.5) (49.2)
Other investing activities (24.6) 9.3
Net Investing Activities from (used for) Continuing Operations (1,168.2) 2,836.2
Net Investing Activities used for Discontinued Operations 0.0 (430.0)
Net Cash Flows from (used for) Investing Activities (1,168.2) 2,406.2
Financing Activities    
Cash of CPG at separation 0.0 (136.8)
Issuance of long-term debt 500.0 0.0
Repayments of long-term debt and capital lease obligations (210.9) (1,859.1)
Premiums and other debt related costs (0.3) (93.5)
Change in short-term borrowings, net 491.6 (1,396.6)
Issuance of common stock 16.8 17.9
Acquisition of treasury stock (8.1) (20.3)
Dividends paid - common stock (152.3) (214.0)
Net Financing Activities from (used for) Continuing Operations 636.8 (3,702.4)
Net Financing Activities from Discontinued Operations 0.0 108.6
Net Cash Flows from (used for) Financing Activities 636.8 (3,593.8)
Change in cash and cash equivalents from continuing operations 1.4 40.1
Change in cash and cash equivalents from discontinued operations (0.8) (33.8)
Change in cash included in discontinued operations 0.0 0.5
Cash and cash equivalents at beginning of period 15.5 24.9
Cash and Cash Equivalents at End of Period $ 16.1 $ 31.7