CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
OPERATING ACTIVITIES
Net income	$ 146.3	$ 276.8
Discontinued operations, net of income taxes	0	(148.2)
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation, depletion and amortization	125.5	120.5
Deferred income taxes	84.6	46.1
Share-based compensation	8.0	13.3
Net (gain) from asset sales	(0.3)	(0.1)
(Income) from unconsolidated affiliate	(2.9)	(2.8)
Distribution from unconsolidated affiliate	3.2	2.7
Changes in operating assets and liabilities	81.5	(24.7)
Net Cash Provided By Operating Activities From Continuing Operations	445.9	283.6
INVESTING ACTIVITIES
Property, plant and equipment	(255.2)	(210.2)
Equity investment in QEP	0	(250.0)
Cash used in disposition of assets	(1.8)	(1.4)
Proceeds from disposition of assets and other	0.3	0.6
Change in notes receivable	0	39.3
Distribution from QEP	0	15.7
Net Cash Used In Investing Activities By Continuing Operations	(256.7)	(406.0)
FINANCING ACTIVITIES
Common stock issued	6.4	12.1
Common stock repurchased	(3.8)	(9.2)
Change in short-term debt	36.0	226.0
Change in notes payable	0	(52.9)
Long-term debt repaid	(182.0)	0
Long-term debt issuance costs	(1.3)	(3.0)
Checks outstanding in excess of cash balances	9.6	5.4
Dividends paid	(81.2)	(70.1)
Tax benefits from share-based compensation	5.3	2.6
Net Cash Provided By (Used In) Financing Activities By Continuing Operations	(211.0)	110.9
CASH USED IN CONTINUING OPERATIONS	(21.8)	(11.5)
Cash provided by operating activities of discontinued operations	0	483.9
Cash used in investing activities of discontinued operations	0	(598.6)
Cash provided by financing activities of discontinued operations	0	95.4
Effect of change in cash and cash equivalents of discontinued operations	0	19.3
Change in cash and cash equivalents	(21.8)	(11.5)
Beginning cash and cash equivalents	21.8	11.5
Ending cash and cash equivalents	0	0
Questar Pipeline [Member]
OPERATING ACTIVITIES
Net income	50.7	49.4
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation and amortization	40.0	37.4
Deferred income taxes	29.3	4.5
Share-based compensation	1.4	0.9
Net (gain) from asset sales	(0.3)	(0.2)
(Income) from unconsolidated affiliate	(2.9)	(2.8)
Distribution from unconsolidated affiliate	3.2	2.7
Changes in operating assets and liabilities	0.1	18.8
Net Cash Provided By Operating Activities From Continuing Operations	121.5	110.7
INVESTING ACTIVITIES
Property, plant and equipment	(83.6)	(68.7)
Cash used in disposition of assets	(0.3)	(0.3)
Proceeds from disposition of assets and other	0.1	0.2
Net Cash Used In Investing Activities By Continuing Operations	(83.8)	(68.8)
FINANCING ACTIVITIES
Change in notes receivable to (from) Questar	30.3	(23.8)
Change in notes payable to (from) Questar	130.3	(0.2)
Long-term debt repaid	(180.0)	0
Checks outstanding in excess of cash balances	0	0.1
Dividends paid	(23.2)	(21.8)
Net Cash Provided By (Used In) Financing Activities By Continuing Operations	(42.6)	(45.7)
Change in cash and cash equivalents	(4.9)	(3.8)
Beginning cash and cash equivalents	5.3	3.8
Ending cash and cash equivalents	0.4	0
Questar Gas [Member]
OPERATING ACTIVITIES
Net income	25.9	21.8
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation and amortization	36.3	36.3
Deferred income taxes	18.0	38.9
Share-based compensation	0.8	1.1
Changes in operating assets and liabilities	73.2	(15.3)
Net Cash Provided By Operating Activities From Continuing Operations	154.2	82.8
INVESTING ACTIVITIES
Property, plant and equipment	(80.4)	(79.9)
Cash used in disposition of assets	(1.5)	(1.1)
Proceeds from disposition of assets and other	0.2	0.4
Net Cash Used In Investing Activities By Continuing Operations	(81.7)	(80.6)
FINANCING ACTIVITIES
Change in notes payable to (from) Questar	(55.7)	10.0
Long-term debt repaid	(2.0)	0
Checks outstanding in excess of cash balances	3.2	2.2
Dividends paid	(22.7)	(21.6)
Net Cash Provided By (Used In) Financing Activities By Continuing Operations	(77.2)	(9.4)
Change in cash and cash equivalents	(4.7)	(7.2)
Beginning cash and cash equivalents	4.7	7.2
Ending cash and cash equivalents	$ 0	$ 0

Amount of equity contributed to an affiliate prior to Spinoff. The affiliate is recorded as an equity method investment on the Company's consolidated balance sheets.

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The net change during the reporting period in current portion (due within one year or one business cycle) of obligation from parent company as evidenced by formal promissory notes.

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The net change during the reporting period of the sum of amounts due within one year (or one business cycle) from notes receivable from the parent company for outstanding loans.

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The aggregate expense recognized in the current period that allocates the cost of tangible and intangible assets to periods that benefit from use of the assets.

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Net change in cash associated with the entity's continuing operations.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.

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The net change between the beginning and ending balance of cash and cash equivalents.

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This element represents cash provided by (used in) the financing activities of the entity's discontinued operations during the period. This element should only be used by those entities that separately report cash flows attributable to discontinued operations. If using this element, it is an indication that the cash flows of the entity which are detailed in reconciling to cash provided by or used in financing activities reflect only cash flows attributable to continuing operations.

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This element represents cash provided by (used in) the investing activities of the entity's discontinued operations during the period. This element should only be used by those entities that separately report cash flows attributable to discontinued operations. If using this element, it is an indication that the cash flows of the entity which are detailed in reconciling to cash provided by or used in investing activities reflect only cash flows attributable to continuing operations.

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This element represents cash provided by (used in) the operating activities of the entity's discontinued operations during the period. This element should only be used by those entities that separately report cash flows attributable to discontinued operations. If using this element, it is an indication that the cash flows of the entity which are detailed in reconciling to cash provided by or used in operating activities reflect only cash flows attributable to continuing operations.

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- Definition

The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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- Definition

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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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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-Publisher SEC

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-Publisher SEC

-Name Regulation S-X (SX)

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-Name Accounting Research Bulletin (ARB)

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.

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The net change during the reporting period of all current assets and liabilities used in operating activities.

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-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The change in cash during the period due to the net increase or decrease in outstanding checks, the liability that represents checks that have been issued but that have not cleared. The entity may classify these cash flows as financing or operating activities.

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Net change in cash associated with the entity's discontinued operations.

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The net cash from (used in) the entity's financing 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 financing activities. Such reporting would necessitate the entity to use the Net Cash Provided by (Used in) Discontinued Operations, Total element provided in the taxonomy.

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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 (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 include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.

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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.

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- Definition

The net cash inflow (outflow) from the costs of disposing of plant, whether by demolishing, dismantling, abandoning, sale, and so forth during the period.

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- Definition

The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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-Publisher FASB

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The cash outflow from the entity's earnings to the shareholders.

+ References

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- Definition

The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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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

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- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The cash inflow from the additional capital contribution to the entity.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The net cash inflow (outflow) from a borrowing supported by a written promise to pay an obligation.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow (outflow) for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A1, A4, A5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 5

-Subparagraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 29

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph a

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(1)

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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