CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income (loss)	$ (55.6)us-gaap_NetIncomeLoss	$ 39.7us-gaap_NetIncomeLoss
Net income attributable to noncontrolling interest	0	5.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	195.4	240.2
Deferred income taxes	(4.8)us-gaap_DeferredIncomeTaxExpenseBenefit	20.7us-gaap_DeferredIncomeTaxExpenseBenefit
Impairment	20.0us-gaap_AssetImpairmentCharges	2.0us-gaap_AssetImpairmentCharges
Share-based compensation	9.1us-gaap_ShareBasedCompensation	7.5us-gaap_ShareBasedCompensation
Amortization of debt issuance costs and discounts	1.9	1.7
Net (gain) loss from asset sales	30.5us-gaap_GainLossOnDispositionOfAssets	(2.4)us-gaap_GainLossOnDispositionOfAssets
Income from unconsolidated affiliates	0	(2.2)
Distributions from unconsolidated affiliates and other	0	2.7
Unrealized (gains) loss on derivative contracts	23.5us-gaap_UnrealizedGainLossOnDerivatives	45.5us-gaap_UnrealizedGainLossOnDerivatives
Changes in operating assets and liabilities	(492.7)	(38.8)
Net Cash (Used In) Provided by Operating Activities	(272.7)	322.4
INVESTING ACTIVITIES
Property acquisitions	0	(946.6)
Property, plant and equipment, including dry exploratory well expense	(342.1)	(330.2)
Proceeds from disposition of assets	1.6	2.9
Acquisition deposit held in escrow	0qep_AcquisitionDepositHeldInEscrow	50.0qep_AcquisitionDepositHeldInEscrow
Net Cash Used in Investing Activities	(340.5)	(1,223.9)
FINANCING ACTIVITIES
Checks outstanding in excess of cash balances	(38.9)	(12.5)
Long-term debt issued	0	300.0
Long-term debt issuance costs paid	0us-gaap_PaymentsOfDebtIssuanceCosts	(1.1)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from credit facility	0us-gaap_ProceedsFromLinesOfCredit	1,643.0us-gaap_ProceedsFromLinesOfCredit
Repayments of credit facility	0us-gaap_RepaymentsOfLinesOfCredit	(1,021.5)us-gaap_RepaymentsOfLinesOfCredit
Treasury stock repurchases	(1.9)	(5.5)
Other capital contributions	(0.4)us-gaap_ProceedsFromOtherEquity	2.9us-gaap_ProceedsFromOtherEquity
Dividends paid	(3.5)us-gaap_PaymentsOfDividendsCommonStock	(3.6)us-gaap_PaymentsOfDividendsCommonStock
Excess tax (provision) benefit on equity-based compensation	(1.8)	(0.6)
Distribution to noncontrolling interest	0us-gaap_PaymentsToMinorityShareholders	(7.6)us-gaap_PaymentsToMinorityShareholders
Net Cash (Used In) Provided by Financing Activities	(46.5)	893.5
Change in cash and cash equivalents	(659.7)	(8.0)
Beginning cash and cash equivalents	1,160.1	11.9
Ending cash and cash equivalents	500.4	3.9
Supplemental Disclosures:
Cash paid for interest, net of capitalized interest	37.6us-gaap_InterestPaidNet	43.8us-gaap_InterestPaidNet
Cash paid for income taxes	509.8us-gaap_IncomeTaxesPaidNet	0us-gaap_IncomeTaxesPaidNet
Non-cash investing activities
Change in capital expenditure accrual balance	$ (59.2)	$ 11.6

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Period Type:	duration

- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow from other equity not otherwise defined in the taxonomy.

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- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Publisher FASB

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-Topic 230

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-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, 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.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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