CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income attributable to QEP	$ 784.4us-gaap_NetIncomeLoss	$ 159.4us-gaap_NetIncomeLoss	$ 128.3us-gaap_NetIncomeLoss
Net income attributable to noncontrolling interest	21.6	12.0	3.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	1,040.6	1,016.0	905.3
Deferred income taxes	(84.1)us-gaap_DeferredIncomeTaxExpenseBenefit	66.1us-gaap_DeferredIncomeTaxExpenseBenefit	32.1us-gaap_DeferredIncomeTaxExpenseBenefit
Impairment	1,143.2us-gaap_AssetImpairmentCharges	93.0us-gaap_AssetImpairmentCharges	133.0us-gaap_AssetImpairmentCharges
Equity-based compensation	27.2us-gaap_ShareBasedCompensation	27.1us-gaap_ShareBasedCompensation	25.6us-gaap_ShareBasedCompensation
Amortization of debt issuance costs and discounts	6.7	6.4	5.3
Net gain from asset sales	(1,644.8)us-gaap_GainLossOnDispositionOfAssets	(103.0)us-gaap_GainLossOnDispositionOfAssets	(1.2)us-gaap_GainLossOnDispositionOfAssets
Income from unconsolidated affiliates	(5.2)	(5.8)	(6.8)
Distributions from unconsolidated affiliates and other	9.4	7.9	7.9
Non-cash loss on early extinguishment of debt	4.4	0	0
Unrealized loss (gain) on derivative contracts	(374.4)us-gaap_UnrealizedGainLossOnDerivatives	88.7us-gaap_UnrealizedGainLossOnDerivatives	(63.2)us-gaap_UnrealizedGainLossOnDerivatives
Changes in operating assets and liabilities
Accounts receivable	(160.5)	3.2	9.6
Inventories	(20.2)us-gaap_IncreaseDecreaseInInventories	2.6us-gaap_IncreaseDecreaseInInventories	28.7us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	(7.3)	14.0	(16.8)
Accounts payable and accrued expenses	320.1	(179.7)	101.3
Federal income taxes	494.1	(27.4)	3.5
Other	(12.7)	11.2	(0.3)
Net Cash Provided by Operating Activities	1,542.5	1,191.7	1,296.0
INVESTING ACTIVITIES
Property acquisitions	(960.5)	(40.9)	(1,406.1)
Property, plant and equipment, including dry exploratory well expense	(1,765.9)	(1,561.7)	(1,393.6)
Proceeds from disposition of assets	3,296.6	211.1	5.2
Acquisition deposit held in escrow	50.0qep_AcquisitionDepositHeldInEscrow	(50.0)qep_AcquisitionDepositHeldInEscrow	0qep_AcquisitionDepositHeldInEscrow
Other investments	(42.0)	0	0
Net Cash Provided by (Used in) Investing Activities	578.2	(1,441.5)	(2,794.5)
FINANCING ACTIVITIES
Checks outstanding in excess of cash balances	(54.4)	69.3	10.3
Long-term debt issued	300.0	0	1,450.0
Long-term debt issuance costs paid	(9.3)us-gaap_PaymentsOfDebtIssuanceCosts	(3.2)us-gaap_PaymentsOfDebtIssuanceCosts	(17.8)us-gaap_PaymentsOfDebtIssuanceCosts
Long-term debt repaid	(600.0)us-gaap_RepaymentsOfSeniorDebt	0us-gaap_RepaymentsOfSeniorDebt	(6.7)us-gaap_RepaymentsOfSeniorDebt
Proceeds from credit facility	5,455.0us-gaap_ProceedsFromLinesOfCredit	3,085.0us-gaap_ProceedsFromLinesOfCredit	2,739.0us-gaap_ProceedsFromLinesOfCredit
Repayments of credit facility	(5,935.0)us-gaap_RepaymentsOfLinesOfCredit	(3,295.0)us-gaap_RepaymentsOfLinesOfCredit	(2,655.5)us-gaap_RepaymentsOfLinesOfCredit
Common stock repurchased and retired	(99.7)	0	0
Treasury stock repurchased	(6.2)	(9.3)	0
Other capital contributions	6.0us-gaap_ProceedsFromOtherEquity	7.0us-gaap_ProceedsFromOtherEquity	(2.2)us-gaap_ProceedsFromOtherEquity
Dividends paid	(14.6)us-gaap_PaymentsOfDividendsCommonStock	(14.3)us-gaap_PaymentsOfDividendsCommonStock	(14.2)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefit on equity-based compensation	(0.5)	0	2.2
Net proceeds from the issuance of common units	0	449.6	0
Distribution to noncontrolling interest	(31.9)us-gaap_PaymentsToMinorityShareholders	(9.3)us-gaap_PaymentsToMinorityShareholders	(6.6)us-gaap_PaymentsToMinorityShareholders
Net Cash (Used in) Provided by Financing Activities	(990.6)	279.8	1,498.5
Change in cash and cash equivalents	1,130.1	30.0	0
Beginning cash and cash equivalents	30.0	0	0
Ending cash and cash equivalents	$ 1,160.1	$ 30.0	$ 0

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The cash outflow to reacquire common stock during the period.

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The cash outflow to reacquire other equity not otherwise defined in the taxonomy.

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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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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to purchase long lived physical asset use for the normal oil and gas operations and not intended for resale.

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The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale.

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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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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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

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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.

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-SubTopic 10

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-SubTopic 10

-Section 45

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-Subparagraph (b)

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

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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.

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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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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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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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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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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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-Publisher FASB

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-Subparagraph (SX 210.5-03.8)

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