Condensed Statements of Consolidated Cash Flows (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Operating Activities
Net Income	$ 244.1	$ 225.4
Adjustments to Reconcile Net Income to Net Cash from Continuing Operations:
Depreciation and amortization	273.4	301.4
Net changes in price risk management assets and liabilities	15.3	4.4
Deferred income taxes and investment tax credits	132.1	38.6
Deferred revenue	(2.6)	(17.2)
Stock compensation expense and 401(k) profit sharing contribution	17.2	6.0
Loss on sale of assets		0.1
Loss on impairment of assets	0.7
Income from unconsolidated affiliates	(4.4)	(7.8)
Gain on disposition of discontinued operations - net of taxes		(0.1)
Loss from discontinued operations - net of taxes	0.2	0.1
Amortization of debt related costs	4.2	5.4
AFUDC equity	(1.9)	(3.7)
Distributions of earnings received from equity investee	9.9	7.9
Changes in Assets and Liabilities:
Accounts receivable	434.6	245.1
Income tax receivable	97.8	24.8
Inventories	13.7	147.6
Accounts payable	(250.4)	(235.4)
Customer deposits and credits	(134.9)	(104.7)
Taxes accrued	(40.7)	6.2
Interest accrued		5.3
Over (Under) recovered gas and fuel costs	220.7	(252.3)
Exchange gas receivable/payable	(166.2)	(51.3)
Other accruals	(26.3)	(30.5)
Prepayments and other current assets	20.6	28.1
Regulatory assets/liabilities	28.3	98.3
Postretirement and postemployment benefits	(118.9)	1.7
Deferred credits	6.3	(3.6)
Deferred charges and other noncurrent assets	12.1	4.6
Other noncurrent liabilities	(4.8)	2.9
Net Operating Activities from Continuing Operations	780.1	447.3
Net Operating Activities used for Discontinued Operations	(44.1)	(44.8)
Net Cash Flows from Operating Activities	736.0	402.5
Investing Activities
Capital expenditures	(445.0)	(336.9)
Insurance recoveries		0.5
Proceeds from disposition of assets	9.4	0.3
Restricted cash withdrawals (deposits)	48.3	(38.0)
Contributions to equity investees	(0.1)	(0.3)
Other investing activities	(36.0)	(19.9)
Net Investing Activities used for Continuing Operations	(423.4)	(394.3)
Net Investing Activities from Discontinued Operations		0.4
Net Cash Flow used for Investing Activities	(423.4)	(393.9)
Financing Activities
Issuance of long-term debt	395.3
Retirement of long-term debt	(13.0)	(5.2)
Premiums and other debt related costs	(8.2)
Change in short-term borrowings, net	(512.2)	109.8
Issuance of common stock	7.9	6.8
Acquisition of treasury stock	(3.0)	(1.4)
Dividends paid - common stock	(128.7)	(127.6)
Net Cash Flow used for Financing Activities	(261.9)	(17.6)
Change in cash and cash equivalents from continuing operations	94.8	35.4
Cash contributions to discontinued operations	(44.1)	(44.4)
Cash and cash equivalents at beginning of period	9.2	16.4
Cash and Cash Equivalents at End of Period	$ 59.9	$ 7.4

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Increase or decrease in exchange gas receivable payable.

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The net amount of deferred income taxes and income tax credits less the tax benefit from exercise of stock options.

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The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss).

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

+ References

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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-Subparagraph (a)
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- Definition

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

+ References

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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- Definition

The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

+ References

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- Definition

The increase (decrease) during the period in the amount of cash payments due to taxing authorities for non-income-related taxes.

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-Publisher FASB
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The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

+ References

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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The increase (decrease) during the reporting period in the aggregate market value of financial instruments that are purchased and held principally for the purpose of hedging or mitigating market risk, credit risk, legal risk, operational risk, and other types of risk.

+ References

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-Publisher FASB
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Period Type:	duration

- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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Period Type:	duration

- Definition

the increase (decrease) in cash associated with the entity's discontinued operations.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

The net cash inflow or outflow from financing activity for the period.

+ References

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- Definition

The net cash inflow or outflow from investing activity.

+ References

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The net cash from (used in) the entity's investing activities specifically EXCLUDING the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in investing activities. Such reporting would necessitate the entity to use the Net Cash provided by or used in Discontinued Operations, Total element provided in the taxonomy.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The net cash from (used in) the entity's continuing operations. This element specifically EXCLUDES the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in operating activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
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-Subparagraph (SX 210.7-04.22)
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-Publisher AICPA
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-Subparagraph a
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher SEC
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

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Period Type:	duration

- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585

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Namespace Prefix:	us-gaap
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Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 15
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Period Type:	duration

- Definition

The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

+ References

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Namespace Prefix:	us-gaap
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Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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