Statements Of Consolidated Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities
Net Income	$ 179.7	$ 275.3
Adjustments to Reconcile Net Income to Net Cash from Continuing Operations:
Depreciation and amortization	132.8	125.0
Deferred income taxes and investment tax credits	102.0	89.9
Stock compensation expense and 401(k) profit sharing contribution	10.9	17.3
Income from discontinued operations - net of taxes	0.0	(82.8)
Amortization of discount/premium on debt	1.9	2.5
AFUDC equity	(2.4)	(2.6)
Other adjustments	(0.4)	0.6
Changes in Assets and Liabilities:
Accounts receivable	11.2	(106.0)
Income tax receivable	0.9	(0.3)
Inventories	218.3	296.5
Accounts payable	(35.2)	(66.1)
Customer deposits and credits	(103.6)	(122.2)
Taxes accrued	25.6	29.2
Interest accrued	(56.8)	(59.3)
Exchange gas receivable/payable	(42.0)	(84.2)
Other accruals	(29.6)	(49.6)
Prepayments and other current assets	(26.7)	(22.3)
Regulatory assets/liabilities	(81.3)	208.6
Postretirement and postemployment benefits	(5.3)	(13.9)
Deferred credits	0.5	4.4
Deferred charges and other noncurrent assets	0.2	5.4
Other noncurrent liabilities	2.5	2.8
Net Operating Activities from Continuing Operations	303.2	448.2
Net Operating Activities from (used for) Discontinued Operations	(0.3)	156.2
Net Cash Flows from Operating Activities	302.9	604.4
Investing Activities
Capital expenditures	(301.0)	(243.5)
Cash contributions from CPG	0.0	500.0
Proceeds from disposition of assets	1.0	1.5
Restricted cash withdrawals	10.3	3.3
Other investing activities	(25.6)	4.8
Net Investing Activities from (used for) Continuing Operations	(315.3)	266.1
Net Investing Activities used for Discontinued Operations	0.0	(154.9)
Net Cash Flows from (used for) Investing Activities	(315.3)	111.2
Financing Activities
Repayments of long-term debt and capital lease obligations	(204.3)	(8.0)
Premiums and other debt related costs	(0.3)	0.0
Change in short-term borrowings, net	277.9	(1,262.9)
Issuance of common stock	4.3	5.9
Acquisition of treasury stock	(7.4)	(20.0)
Dividends paid - common stock	(49.6)	(82.2)
Net Financing Activities from (used for) Continuing Operations	20.6	(1,367.2)
Net Financing Activities from Discontinued Operations	0.0	668.4
Net Cash Flows from (used for) Financing Activities	20.6	(698.8)
Change in cash and cash equivalents from continuing operations	8.5	(652.9)
Change in cash and cash equivalents from discontinued operations	(0.3)	669.7
Change in cash included in discontinued operations	0.0	(6.8)
Cash and cash equivalents at beginning of period	15.5	24.9
Cash and Cash Equivalents at End of Period	$ 23.7	$ 34.9