Discontinued Operations Income Statement Impact Of Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
NGL sales										$ 80.0	$ 223.3	$ 192.2
Other revenues										15.1	11.1	22.4
Purchased gas, oil and NGL sales										620.8	913.9	774.9
Total Revenues		$ 468.3	$ 507.6	$ 574.6	$ 468.1	$ 757.1	$ 858.5	$ 850.0	$ 827.6	2,018.6	3,293.2	2,685.1
Purchased gas, oil and NGL expense										(626.8)	(910.1)	(783.5)
Lease operating expense										(238.8)	(240.1)	(181.3)
Natural gas, oil and NGL transportation and other handling costs										(291.3)	(277.6)	(222.0)
Gathering and other expense										5.8	6.7	8.4
General and administrative										181.1	204.4	160.4
Production and property taxes										117.6	205.2	161.3
Depreciation, depletion and amortization										881.1	994.7	963.8
Total Operating Expenses										2,400.8	3,991.9	2,585.6
Net gain (loss) from asset sales										4.6	(148.6)	103.5
OPERATING INCOME (LOSS)		$ (144.6)	$ (87.7)	$ (16.7)	$ (128.6)	(1,067.3)	115.1	(35.9)	140.8	(377.6)	(847.3)	203.0
Realized and unrealized gains (losses) on derivative contracts										277.2	363.3	58.9
Interest and other income										3.0	12.8	15.2
Income from unconsolidated affiliates										0.0	0.3	0.2
Loss from early extinguishment of debt										0.0	(2.0)	0.0
Interest expense										145.6	169.1	165.1
Net income attributable to noncontrolling interest										0.0	21.6	12.0
NET INCOME FROM DISCONTINUED OPERATIONS, NET OF INCOME TAX						$ 1,135.7	$ 17.4	$ 13.8	$ 27.0	$ 0.0	1,193.9	107.3
Income from discontinued operations before income taxes attributable to QEP from QEP Midstream	[1]										$ 28.9	33.5
Ownership Percentage	[1]					57.80%					57.80%
Midstream Business Held For Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Oil and Gas Property and Equipment											$ 55.2	88.9
NGL sales											109.3	101.9
Other revenues											140.9	166.6
Purchased gas, oil and NGL sales	[2]										(47.1)	(17.8)
Total Revenues											203.1	250.7
Purchased gas, oil and NGL expense	[2]										(48.5)	(17.6)
Lease operating expense	[2]										(5.5)	(3.5)
Natural gas, oil and NGL transportation and other handling costs	[2]										(55.4)	(80.6)
Gathering and other expense											85.9	82.2
General and administrative											42.1	30.7
Production and property taxes											7.3	5.2
Depreciation, depletion and amortization											45.9	52.2
Total Operating Expenses											71.8	68.6
Net gain (loss) from asset sales											1,793.4	(0.5)
OPERATING INCOME (LOSS)											1,924.7	181.6
Interest and other income											0.3	(10.0)
Income from unconsolidated affiliates											4.9	5.6
Loss from early extinguishment of debt											(2.4)	0.0
Interest Income (Expense), Net											(3.8)	1.8
INCOME FROM DISCONTINUED OPERATIONS BEFORE INCOME TAXES	[1]										1,923.7	179.0
Income taxes											(708.2)	(59.7)
NET INCOME FROM DISCONTINUED OPERATIONS											1,215.5	119.3
Net income attributable to noncontrolling interest											(21.6)	(12.0)
NET INCOME FROM DISCONTINUED OPERATIONS, NET OF INCOME TAX											$ 1,193.9	$ 107.3

[1] Includes income from discontinued operations before income taxes attributable to QEP from QEP Midstream (of which QEP owned 57.8%) of $28.9 million and $33.5 million for the years ended December 31, 2014 and 2013, respectively.

[2] Includes discontinued intercompany eliminations.